.source.1520882357082.html

<script>(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict';

var cache = {};
var start = '(?:^|\\s)';
var end = '(?:\\s|$)';

function lookupClass (className) {
  var cached = cache[className];
  if (cached) {
    cached.lastIndex = 0;
  } else {
    cache[className] = cached = new RegExp(start + className + end, 'g');
  }
  return cached;
}

function addClass (el, className) {
  var current = el.className;
  if (!current.length) {
    el.className = className;
  } else if (!lookupClass(className).test(current)) {
    el.className += ' ' + className;
  }
}

function rmClass (el, className) {
  el.className = el.className.replace(lookupClass(className), ' ').trim();
}

module.exports = {
  add: addClass,
  rm: rmClass
};

},{}],2:[function(require,module,exports){
(function (global){
'use strict';

var emitter = require('contra/emitter');
var crossvent = require('crossvent');
var classes = require('./classes');
var doc = document;
var documentElement = doc.documentElement;

function dragula (initialContainers, options) {
  var len = arguments.length;
  if (len === 1 && Array.isArray(initialContainers) === false) {
    options = initialContainers;
    initialContainers = [];
  }
  var _mirror; // mirror image
  var _source; // source container
  var _item; // item being dragged
  var _offsetX; // reference x
  var _offsetY; // reference y
  var _moveX; // reference move x
  var _moveY; // reference move y
  var _initialSibling; // reference sibling when grabbed
  var _currentSibling; // reference sibling now
  var _copy; // item used for copying
  var _renderTimer; // timer for setTimeout renderMirrorImage
  var _lastDropTarget = null; // last container item was over
  var _grabbed; // holds mousedown context until first mousemove

  var o = options || {};
  if (o.moves === void 0) { o.moves = always; }
  if (o.accepts === void 0) { o.accepts = always; }
  if (o.invalid === void 0) { o.invalid = invalidTarget; }
  if (o.containers === void 0) { o.containers = initialContainers || []; }
  if (o.isContainer === void 0) { o.isContainer = never; }
  if (o.copy === void 0) { o.copy = false; }
  if (o.copySortSource === void 0) { o.copySortSource = false; }
  if (o.revertOnSpill === void 0) { o.revertOnSpill = false; }
  if (o.removeOnSpill === void 0) { o.removeOnSpill = false; }
  if (o.direction === void 0) { o.direction = 'vertical'; }
  if (o.ignoreInputTextSelection === void 0) { o.ignoreInputTextSelection = true; }
  if (o.deadzone === void 0) { o.deadzone = 0; }
  if (o.mirrorContainer === void 0) { o.mirrorContainer = doc.body; }

  var drake = emitter({
    containers: o.containers,
    start: manualStart,
    end: end,
    cancel: cancel,
    remove: remove,
    destroy: destroy,
    canMove: canMove,
    dragging: false
  });

  if (o.removeOnSpill === true) {
    drake.on('over', spillOver).on('out', spillOut);
  }

  events();

  return drake;

  function isContainer (el) {
    return drake.containers.indexOf(el) !== -1 || o.isContainer(el);
  }

  function events (remove) {
    var op = remove ? 'remove' : 'add';
    touchy(documentElement, op, 'mousedown', grab);
    touchy(documentElement, op, 'mouseup', release);
  }

  function eventualMovements (remove) {
    var op = remove ? 'remove' : 'add';
    touchy(documentElement, op, 'mousemove', startBecauseMouseMoved);
  }

  function movements (remove) {
    var op = remove ? 'remove' : 'add';
    crossvent[op](documentElement, 'selectstart', preventGrabbed); // IE8
    crossvent[op](documentElement, 'click', preventGrabbed);
  }

  function destroy () {
    events(true);
    release({});
  }

  function preventGrabbed (e) {
    if (_grabbed) {
      e.preventDefault();
    }
  }

  function grab (e) {
    _moveX = e.clientX;
    _moveY = e.clientY;

    var ignore = whichMouseButton(e) !== 1 || e.metaKey || e.ctrlKey;
    if (ignore) {
      return; // we only care about honest-to-god left clicks and touch events
    }
    var item = e.target;
    var context = canStart(item);
    if (!context) {
      return;
    }
    _grabbed = context;
    eventualMovements();
    if (e.type === 'mousedown') {
      if (isInput(item)) { // see also: https://github.com/bevacqua/dragula/issues/208
        item.focus(); // fixes https://github.com/bevacqua/dragula/issues/176
      } else {
        e.preventDefault(); // fixes https://github.com/bevacqua/dragula/issues/155
      }
    }
  }

  function startBecauseMouseMoved (e) {
    var clientX = getCoord('clientX', e);
    var clientY = getCoord('clientY', e);

    if (!_grabbed) {
      return;
    }
    if (whichMouseButton(e) === 0) {
      release({});
      return; // when text is selected on an input and then dragged, mouseup doesn't fire. this is our only hope
    }
    // truthy check fixes #239, equality fixes #207
    if (e.clientX !== void 0 && e.clientX === _moveX && e.clientY !== void 0 && e.clientY === _moveY) {
      return;
    }
    if (o.ignoreInputTextSelection) {
      var elementBehindCursor = doc.elementFromPoint(clientX, clientY);
      if (isInput(elementBehindCursor)) {
        return;
      }
    }
    var grabTravelDistance = distance({
      x: _moveX,
      y: _moveY
    }, {
      x: clientX,
      y: clientY
    });
    if (grabTravelDistance <= o.deadzone) {
      return;
    }

    var grabbed = _grabbed; // call to end() unsets _grabbed
    eventualMovements(true);
    movements();
    end();
    start(grabbed);

    var offset = getOffset(_item);
    _offsetX = getCoord('pageX', e) - offset.left;
    _offsetY = getCoord('pageY', e) - offset.top;

    classes.add(_copy || _item, 'gu-transit');
    renderMirrorImage();
    drag(e);
  }

  function canStart (item) {
    if (drake.dragging && _mirror) {
      return;
    }
    if (isContainer(item)) {
      return; // don't drag container itself
    }
    var handle = item;
    while (getParent(item) && isContainer(getParent(item)) === false) {
      if (o.invalid(item, handle)) {
        return;
      }
      item = getParent(item); // drag target should be a top element
      if (!item) {
        return;
      }
    }
    var source = getParent(item);
    if (!source) {
      return;
    }
    if (o.invalid(item, handle)) {
      return;
    }

    var movable = o.moves(item, source, handle, nextEl(item));
    if (!movable) {
      return;
    }

    return {
      item: item,
      source: source
    };
  }

  function canMove (item) {
    return !!canStart(item);
  }

  function manualStart (item) {
    var context = canStart(item);
    if (context) {
      start(context);
    }
  }

  function start (context) {
    if (isCopy(context.item, context.source)) {
      _copy = context.item.cloneNode(true);
      drake.emit('cloned', _copy, context.item, 'copy');
    }

    _source = context.source;
    _item = context.item;
    _initialSibling = _currentSibling = nextEl(context.item);

    drake.dragging = true;
    drake.emit('drag', _item, _source);
  }

  function invalidTarget () {
    return false;
  }

  function end () {
    if (!drake.dragging) {
      return;
    }
    var item = _copy || _item;
    drop(item, getParent(item));
  }

  function ungrab () {
    _grabbed = false;
    eventualMovements(true);
    movements(true);
  }

  function release (e) {
    ungrab();

    if (!drake.dragging) {
      return;
    }
    var item = _copy || _item;
    var clientX = getCoord('clientX', e);
    var clientY = getCoord('clientY', e);
    var elementBehindCursor = getElementBehindPoint(_mirror, clientX, clientY);
    var dropTarget = findDropTarget(elementBehindCursor, clientX, clientY);
    if (dropTarget && ((_copy && o.copySortSource) || (!_copy || dropTarget !== _source))) {
      drop(item, dropTarget);
    } else if (o.removeOnSpill) {
      remove();
    } else {
      cancel();
    }
  }

  function drop (item, target) {
    var parent = getParent(item);
    if (_copy && o.copySortSource && target === _source) {
      parent.removeChild(_item);
    }
    if (isInitialPlacement(target)) {
      drake.emit('cancel', item, _source, _source);
    } else {
      drake.emit('drop', item, target, _source, _currentSibling);
    }
    cleanup();
  }

  function remove () {
    if (!drake.dragging) {
      return;
    }
    var item = _copy || _item;
    var parent = getParent(item);
    if (parent) {
      parent.removeChild(item);
    }
    drake.emit(_copy ? 'cancel' : 'remove', item, parent, _source);
    cleanup();
  }

  function cancel (revert) {
    if (!drake.dragging) {
      return;
    }
    var reverts = arguments.length > 0 ? revert : o.revertOnSpill;
    var item = _copy || _item;
    var parent = getParent(item);
    var initial = isInitialPlacement(parent);
    if (initial === false && reverts) {
      if (_copy) {
        if (parent) {
          parent.removeChild(_copy);
        }
      } else {
        _source.insertBefore(item, _initialSibling);
      }
    }
    if (initial || reverts) {
      drake.emit('cancel', item, _source, _source);
    } else {
      drake.emit('drop', item, parent, _source, _currentSibling);
    }
    cleanup();
  }

  function cleanup () {
    var item = _copy || _item;
    ungrab();
    removeMirrorImage();
    if (item) {
      classes.rm(item, 'gu-transit');
    }
    if (_renderTimer) {
      clearTimeout(_renderTimer);
    }
    drake.dragging = false;
    if (_lastDropTarget) {
      drake.emit('out', item, _lastDropTarget, _source);
    }
    drake.emit('dragend', item);
    _source = _item = _copy = _initialSibling = _currentSibling = _renderTimer = _lastDropTarget = null;
  }

  function isInitialPlacement (target, s) {
    var sibling;
    if (s !== void 0) {
      sibling = s;
    } else if (_mirror) {
      sibling = _currentSibling;
    } else {
      sibling = nextEl(_copy || _item);
    }
    return target === _source && sibling === _initialSibling;
  }

  function findDropTarget (elementBehindCursor, clientX, clientY) {
    var target = elementBehindCursor;
    while (target && !accepted()) {
      target = getParent(target);
    }
    return target;

    function accepted () {
      var droppable = isContainer(target);
      if (droppable === false) {
        return false;
      }

      var immediate = getImmediateChild(target, elementBehindCursor);
      var reference = getReference(target, immediate, clientX, clientY);
      var initial = isInitialPlacement(target, reference);
      if (initial) {
        return true; // should always be able to drop it right back where it was
      }
      return o.accepts(_item, target, _source, reference);
    }
  }

  function drag (e) {
    if (!_mirror) {
      return;
    }
    e.preventDefault();

    var clientX = getCoord('clientX', e);
    var clientY = getCoord('clientY', e);
    var x = clientX - _offsetX;
    var y = clientY - _offsetY;

    _mirror.style.left = x + 'px';
    _mirror.style.top = y + 'px';

    var item = _copy || _item;
    var elementBehindCursor = getElementBehindPoint(_mirror, clientX, clientY);
    var dropTarget = findDropTarget(elementBehindCursor, clientX, clientY);
    var changed = dropTarget !== null && dropTarget !== _lastDropTarget;
    if (changed || dropTarget === null) {
      out();
      _lastDropTarget = dropTarget;
      over();
    }
    var parent = getParent(item);
    if (dropTarget === _source && _copy && !o.copySortSource) {
      if (parent) {
        parent.removeChild(item);
      }
      return;
    }
    var reference;
    var immediate = getImmediateChild(dropTarget, elementBehindCursor);
    if (immediate !== null) {
      reference = getReference(dropTarget, immediate, clientX, clientY);
    } else if (o.revertOnSpill === true && !_copy) {
      reference = _initialSibling;
      dropTarget = _source;
    } else {
      if (_copy && parent) {
        parent.removeChild(item);
      }
      return;
    }
    if (
      (reference === null && changed) ||
      reference !== item &&
      reference !== nextEl(item)
    ) {
      _currentSibling = reference;
      dropTarget.insertBefore(item, reference);
      drake.emit('shadow', item, dropTarget, _source);
    }
    function moved (type) { drake.emit(type, item, _lastDropTarget, _source); }
    function over () { if (changed) { moved('over'); } }
    function out () { if (_lastDropTarget) { moved('out'); } }
  }

  function spillOver (el) {
    classes.rm(el, 'gu-hide');
  }

  function spillOut (el) {
    if (drake.dragging) { classes.add(el, 'gu-hide'); }
  }

  function renderMirrorImage () {
    if (_mirror) {
      return;
    }
    var rect = _item.getBoundingClientRect();
    _mirror = _item.cloneNode(true);
    _mirror.style.width = getRectWidth(rect) + 'px';
    _mirror.style.height = getRectHeight(rect) + 'px';
    classes.rm(_mirror, 'gu-transit');
    classes.add(_mirror, 'gu-mirror');
    o.mirrorContainer.appendChild(_mirror);
    touchy(documentElement, 'add', 'mousemove', drag);
    classes.add(o.mirrorContainer, 'gu-unselectable');
    drake.emit('cloned', _mirror, _item, 'mirror');
  }

  function removeMirrorImage () {
    if (_mirror) {
      classes.rm(o.mirrorContainer, 'gu-unselectable');
      touchy(documentElement, 'remove', 'mousemove', drag);
      getParent(_mirror).removeChild(_mirror);
      _mirror = null;
    }
  }

  function getImmediateChild (dropTarget, target) {
    var immediate = target;
    while (immediate !== dropTarget && getParent(immediate) !== dropTarget) {
      immediate = getParent(immediate);
    }
    if (immediate === documentElement) {
      return null;
    }
    return immediate;
  }

  function getReference (dropTarget, target, x, y) {
    var horizontal = o.direction === 'horizontal';
    var reference = target !== dropTarget ? inside() : outside();
    return reference;

    function outside () { // slower, but able to figure out any position
      var len = dropTarget.children.length;
      var i;
      var el;
      var rect;
      for (i = 0; i < len; i++) {
        el = dropTarget.children[i];
        rect = el.getBoundingClientRect();
        if (horizontal && (rect.left + rect.width / 2) > x) { return el; }
        if (!horizontal && (rect.top + rect.height / 2) > y) { return el; }
      }
      return null;
    }

    function inside () { // faster, but only available if dropped inside a child element
      var rect = target.getBoundingClientRect();
      if (horizontal) {
        return resolve(x > rect.left + getRectWidth(rect) / 2);
      }
      return resolve(y > rect.top + getRectHeight(rect) / 2);
    }

    function resolve (after) {
      return after ? nextEl(target) : target;
    }
  }

  function isCopy (item, container) {
    return typeof o.copy === 'boolean' ? o.copy : o.copy(item, container);
  }
}

function touchy (el, op, type, fn) {
  var touch = {
    mouseup: 'touchend',
    mousedown: 'touchstart',
    mousemove: 'touchmove'
  };
  var pointers = {
    mouseup: 'pointerup',
    mousedown: 'pointerdown',
    mousemove: 'pointermove'
  };
  var microsoft = {
    mouseup: 'MSPointerUp',
    mousedown: 'MSPointerDown',
    mousemove: 'MSPointerMove'
  };
  if (global.navigator.pointerEnabled) {
    crossvent[op](el, pointers[type], fn);
  } else if (global.navigator.msPointerEnabled) {
    crossvent[op](el, microsoft[type], fn);
  } else {
    crossvent[op](el, touch[type], fn);
    crossvent[op](el, type, fn);
  }
}


function distance(pt1, pt2) {
  var dist2 = Math.pow(pt1.x - pt2.x, 2) + Math.pow(pt1.y - pt2.y, 2);
  var dist = Math.sqrt(dist2);
  return dist;
}

function whichMouseButton (e) {
  if (e.touches !== void 0) { return e.touches.length; }
  if (e.which !== void 0 && e.which !== 0) { return e.which; } // see https://github.com/bevacqua/dragula/issues/261
  if (e.buttons !== void 0) { return e.buttons; }
  var button = e.button;
  if (button !== void 0) { // see https://github.com/jquery/jquery/blob/99e8ff1baa7ae341e94bb89c3e84570c7c3ad9ea/src/event.js#L573-L575
    return button & 1 ? 1 : button & 2 ? 3 : (button & 4 ? 2 : 0);
  }
}

function getOffset (el) {
  var rect = el.getBoundingClientRect();
  return {
    left: rect.left + getScroll('scrollLeft', 'pageXOffset'),
    top: rect.top + getScroll('scrollTop', 'pageYOffset')
  };
}

function getScroll (scrollProp, offsetProp) {
  if (typeof global[offsetProp] !== 'undefined') {
    return global[offsetProp];
  }
  if (documentElement.clientHeight) {
    return documentElement[scrollProp];
  }
  return doc.body[scrollProp];
}

function getElementBehindPoint (point, x, y) {
  var p = point || {};
  var state = p.className;
  var el;
  p.className += ' gu-hide';
  el = doc.elementFromPoint(x, y);
  p.className = state;
  return el;
}

function never () { return false; }
function always () { return true; }
function getRectWidth (rect) { return rect.width || (rect.right - rect.left); }
function getRectHeight (rect) { return rect.height || (rect.bottom - rect.top); }
function getParent (el) { return el.parentNode === doc ? null : el.parentNode; }
function isInput (el) { return el.tagName === 'INPUT' || el.tagName === 'TEXTAREA' || el.tagName === 'SELECT' || isEditable(el); }
function isEditable (el) {
  if (!el) { return false; } // no parents were editable
  if (el.contentEditable === 'false') { return false; } // stop the lookup
  if (el.contentEditable === 'true') { return true; } // found a contentEditable element in the chain
  return isEditable(getParent(el)); // contentEditable is set to 'inherit'
}

function nextEl (el) {
  return el.nextElementSibling || manually();
  function manually () {
    var sibling = el;
    do {
      sibling = sibling.nextSibling;
    } while (sibling && sibling.nodeType !== 1);
    return sibling;
  }
}

function getEventHost (e) {
  // on touchend event, we have to use `e.changedTouches`
  // see http://stackoverflow.com/questions/7192563/touchend-event-properties
  // see https://github.com/bevacqua/dragula/issues/34
  if (e.targetTouches && e.targetTouches.length) {
    return e.targetTouches[0];
  }
  if (e.changedTouches && e.changedTouches.length) {
    return e.changedTouches[0];
  }
  return e;
}

function getCoord (coord, e) {
  var host = getEventHost(e);
  var missMap = {
    pageX: 'clientX', // IE8
    pageY: 'clientY' // IE8
  };
  if (coord in missMap && !(coord in host) && missMap[coord] in host) {
    coord = missMap[coord];
  }
  return host[coord];
}

module.exports = dragula;

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./classes":1,"contra/emitter":10,"crossvent":12}],3:[function(require,module,exports){
module.exports = function atoa (a, n) { return Array.prototype.slice.call(a, n); }

},{}],4:[function(require,module,exports){
var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

;(function (exports) {
	'use strict';

  var Arr = (typeof Uint8Array !== 'undefined')
    ? Uint8Array
    : Array

	var PLUS   = '+'.charCodeAt(0)
	var SLASH  = '/'.charCodeAt(0)
	var NUMBER = '0'.charCodeAt(0)
	var LOWER  = 'a'.charCodeAt(0)
	var UPPER  = 'A'.charCodeAt(0)
	var PLUS_URL_SAFE = '-'.charCodeAt(0)
	var SLASH_URL_SAFE = '_'.charCodeAt(0)

	function decode (elt) {
		var code = elt.charCodeAt(0)
		if (code === PLUS ||
		    code === PLUS_URL_SAFE)
			return 62 // '+'
		if (code === SLASH ||
		    code === SLASH_URL_SAFE)
			return 63 // '/'
		if (code < NUMBER)
			return -1 //no match
		if (code < NUMBER + 10)
			return code - NUMBER + 26 + 26
		if (code < UPPER + 26)
			return code - UPPER
		if (code < LOWER + 26)
			return code - LOWER + 26
	}

	function b64ToByteArray (b64) {
		var i, j, l, tmp, placeHolders, arr

		if (b64.length % 4 > 0) {
			throw new Error('Invalid string. Length must be a multiple of 4')
		}

		// the number of equal signs (place holders)
		// if there are two placeholders, than the two characters before it
		// represent one byte
		// if there is only one, then the three characters before it represent 2 bytes
		// this is just a cheap hack to not do indexOf twice
		var len = b64.length
		placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0

		// base64 is 4/3 + up to two characters of the original data
		arr = new Arr(b64.length * 3 / 4 - placeHolders)

		// if there are placeholders, only get up to the last complete 4 chars
		l = placeHolders > 0 ? b64.length - 4 : b64.length

		var L = 0

		function push (v) {
			arr[L++] = v
		}

		for (i = 0, j = 0; i < l; i += 4, j += 3) {
			tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
			push((tmp & 0xFF0000) >> 16)
			push((tmp & 0xFF00) >> 8)
			push(tmp & 0xFF)
		}

		if (placeHolders === 2) {
			tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
			push(tmp & 0xFF)
		} else if (placeHolders === 1) {
			tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
			push((tmp >> 8) & 0xFF)
			push(tmp & 0xFF)
		}

		return arr
	}

	function uint8ToBase64 (uint8) {
		var i,
			extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
			output = "",
			temp, length

		function encode (num) {
			return lookup.charAt(num)
		}

		function tripletToBase64 (num) {
			return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
		}

		// go through the array every three bytes, we'll deal with trailing stuff later
		for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
			temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
			output += tripletToBase64(temp)
		}

		// pad the end with zeros, but make sure to not forget the extra bytes
		switch (extraBytes) {
			case 1:
				temp = uint8[uint8.length - 1]
				output += encode(temp >> 2)
				output += encode((temp << 4) & 0x3F)
				output += '=='
				break
			case 2:
				temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
				output += encode(temp >> 10)
				output += encode((temp >> 4) & 0x3F)
				output += encode((temp << 2) & 0x3F)
				output += '='
				break
		}

		return output
	}

	exports.toByteArray = b64ToByteArray
	exports.fromByteArray = uint8ToBase64
}(typeof exports === 'undefined' ? (this.base64js = {}) : exports))

},{}],5:[function(require,module,exports){

},{}],6:[function(require,module,exports){
arguments[4][5][0].apply(exports,arguments)
},{"dup":5}],7:[function(require,module,exports){
(function (global){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')
var isArray = require('isarray')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50
Buffer.poolSize = 8192 // not used by this implementation

var rootParent = {}

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * Due to various browser bugs, sometimes the Object implementation will be used even
 * when the browser supports typed arrays.
 *
 * Note:
 *
 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 *
 *   - Safari 5-7 lacks support for changing the `Object.prototype.constructor` property
 *     on objects.
 *
 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 *
 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
 *     incorrect length in some situations.

 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
 * get the Object implementation, which is slower but behaves correctly.
 */
Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
  ? global.TYPED_ARRAY_SUPPORT
  : typedArraySupport()

function typedArraySupport () {
  function Bar () {}
  try {
    var arr = new Uint8Array(1)
    arr.foo = function () { return 42 }
    arr.constructor = Bar
    return arr.foo() === 42 && // typed array instances can be augmented
        arr.constructor === Bar && // constructor can be set
        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
  } catch (e) {
    return false
  }
}

function kMaxLength () {
  return Buffer.TYPED_ARRAY_SUPPORT
    ? 0x7fffffff
    : 0x3fffffff
}

/**
 * Class: Buffer
 * =============
 *
 * The Buffer constructor returns instances of `Uint8Array` that are augmented
 * with function properties for all the node `Buffer` API functions. We use
 * `Uint8Array` so that square bracket notation works as expected -- it returns
 * a single octet.
 *
 * By augmenting the instances, we can avoid modifying the `Uint8Array`
 * prototype.
 */
function Buffer (arg) {
  if (!(this instanceof Buffer)) {
    // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
    if (arguments.length > 1) return new Buffer(arg, arguments[1])
    return new Buffer(arg)
  }

  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    this.length = 0
    this.parent = undefined
  }

  // Common case.
  if (typeof arg === 'number') {
    return fromNumber(this, arg)
  }

  // Slightly less common case.
  if (typeof arg === 'string') {
    return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
  }

  // Unusual.
  return fromObject(this, arg)
}

function fromNumber (that, length) {
  that = allocate(that, length < 0 ? 0 : checked(length) | 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    for (var i = 0; i < length; i++) {
      that[i] = 0
    }
  }
  return that
}

function fromString (that, string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'

  // Assumption: byteLength() return value is always < kMaxLength.
  var length = byteLength(string, encoding) | 0
  that = allocate(that, length)

  that.write(string, encoding)
  return that
}

function fromObject (that, object) {
  if (Buffer.isBuffer(object)) return fromBuffer(that, object)

  if (isArray(object)) return fromArray(that, object)

  if (object == null) {
    throw new TypeError('must start with number, buffer, array or string')
  }

  if (typeof ArrayBuffer !== 'undefined') {
    if (object.buffer instanceof ArrayBuffer) {
      return fromTypedArray(that, object)
    }
    if (object instanceof ArrayBuffer) {
      return fromArrayBuffer(that, object)
    }
  }

  if (object.length) return fromArrayLike(that, object)

  return fromJsonObject(that, object)
}

function fromBuffer (that, buffer) {
  var length = checked(buffer.length) | 0
  that = allocate(that, length)
  buffer.copy(that, 0, 0, length)
  return that
}

function fromArray (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

// Duplicate of fromArray() to keep fromArray() monomorphic.
function fromTypedArray (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  // Truncating the elements is probably not what people expect from typed
  // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
  // of the old Buffer constructor.
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

function fromArrayBuffer (that, array) {
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    array.byteLength
    that = Buffer._augment(new Uint8Array(array))
  } else {
    // Fallback: Return an object instance of the Buffer class
    that = fromTypedArray(that, new Uint8Array(array))
  }
  return that
}

function fromArrayLike (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

// Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
// Returns a zero-length buffer for inputs that don't conform to the spec.
function fromJsonObject (that, object) {
  var array
  var length = 0

  if (object.type === 'Buffer' && isArray(object.data)) {
    array = object.data
    length = checked(array.length) | 0
  }
  that = allocate(that, length)

  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

if (Buffer.TYPED_ARRAY_SUPPORT) {
  Buffer.prototype.__proto__ = Uint8Array.prototype
  Buffer.__proto__ = Uint8Array
} else {
  // pre-set for values that may exist in the future
  Buffer.prototype.length = undefined
  Buffer.prototype.parent = undefined
}

function allocate (that, length) {
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = Buffer._augment(new Uint8Array(length))
    that.__proto__ = Buffer.prototype
  } else {
    // Fallback: Return an object instance of the Buffer class
    that.length = length
    that._isBuffer = true
  }

  var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
  if (fromPool) that.parent = rootParent

  return that
}

function checked (length) {
  // Note: cannot use `length < kMaxLength` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= kMaxLength()) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (subject, encoding) {
  if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)

  var buf = new Buffer(subject, encoding)
  delete buf.parent
  return buf
}

Buffer.isBuffer = function isBuffer (b) {
  return !!(b != null && b._isBuffer)
}

Buffer.compare = function compare (a, b) {
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  var i = 0
  var len = Math.min(x, y)
  while (i < len) {
    if (a[i] !== b[i]) break

    ++i
  }

  if (i !== len) {
    x = a[i]
    y = b[i]
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'binary':
    case 'base64':
    case 'raw':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')

  if (list.length === 0) {
    return new Buffer(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; i++) {
      length += list[i].length
    }
  }

  var buf = new Buffer(length)
  var pos = 0
  for (i = 0; i < list.length; i++) {
    var item = list[i]
    item.copy(buf, pos)
    pos += item.length
  }
  return buf
}

function byteLength (string, encoding) {
  if (typeof string !== 'string') string = '' + string

  var len = string.length
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'binary':
      // Deprecated
      case 'raw':
      case 'raws':
        return len
      case 'utf8':
      case 'utf-8':
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  start = start | 0
  end = end === undefined || end === Infinity ? this.length : end | 0

  if (!encoding) encoding = 'utf8'
  if (start < 0) start = 0
  if (end > this.length) end = this.length
  if (end <= start) return ''

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'binary':
        return binarySlice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toString = function toString () {
  var length = this.length | 0
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
    if (this.length > max) str += ' ... '
  }
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return 0
  return Buffer.compare(this, b)
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
  if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
  else if (byteOffset < -0x80000000) byteOffset = -0x80000000
  byteOffset >>= 0

  if (this.length === 0) return -1
  if (byteOffset >= this.length) return -1

  // Negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)

  if (typeof val === 'string') {
    if (val.length === 0) return -1 // special case: looking for empty string always fails
    return String.prototype.indexOf.call(this, val, byteOffset)
  }
  if (Buffer.isBuffer(val)) {
    return arrayIndexOf(this, val, byteOffset)
  }
  if (typeof val === 'number') {
    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
    }
    return arrayIndexOf(this, [ val ], byteOffset)
  }

  function arrayIndexOf (arr, val, byteOffset) {
    var foundIndex = -1
    for (var i = 0; byteOffset + i < arr.length; i++) {
      if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
      } else {
        foundIndex = -1
      }
    }
    return -1
  }

  throw new TypeError('val must be string, number or Buffer')
}

// `get` is deprecated
Buffer.prototype.get = function get (offset) {
  console.log('.get() is deprecated. Access using array indexes instead.')
  return this.readUInt8(offset)
}

// `set` is deprecated
Buffer.prototype.set = function set (v, offset) {
  console.log('.set() is deprecated. Access using array indexes instead.')
  return this.writeUInt8(v, offset)
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  // must be an even number of digits
  var strLen = string.length
  if (strLen % 2 !== 0) throw new Error('Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; i++) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (isNaN(parsed)) throw new Error('Invalid hex string')
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function binaryWrite (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset | 0
    if (isFinite(length)) {
      length = length | 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  // legacy write(string, encoding, offset, length) - remove in v0.13
  } else {
    var swap = encoding
    encoding = offset
    offset = length | 0
    length = swap
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'binary':
        return binaryWrite(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function binarySlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; i++) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    newBuf = Buffer._augment(this.subarray(start, end))
  } else {
    var sliceLen = end - start
    newBuf = new Buffer(sliceLen, undefined)
    for (var i = 0; i < sliceLen; i++) {
      newBuf[i] = this[i + start]
    }
  }

  if (newBuf.length) newBuf.parent = this.parent || this

  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('value is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  this[offset] = (value & 0xff)
  return offset + 1
}

function objectWriteUInt16 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
      (littleEndian ? i : 1 - i) * 8
  }
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

function objectWriteUInt32 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffffffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
  }
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset + 3] = (value >>> 24)
    this[offset + 2] = (value >>> 16)
    this[offset + 1] = (value >>> 8)
    this[offset] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = value < 0 ? 1 : 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = value < 0 ? 1 : 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (value > max || value < min) throw new RangeError('value is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('index out of range')
  if (offset < 0) throw new RangeError('index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start
  var i

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; i--) {
      target[i + targetStart] = this[i + start]
    }
  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
    // ascending copy from start
    for (i = 0; i < len; i++) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    target._set(this.subarray(start, start + len), targetStart)
  }

  return len
}

// fill(value, start=0, end=buffer.length)
Buffer.prototype.fill = function fill (value, start, end) {
  if (!value) value = 0
  if (!start) start = 0
  if (!end) end = this.length

  if (end < start) throw new RangeError('end < start')

  // Fill 0 bytes; we're done
  if (end === start) return
  if (this.length === 0) return

  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')

  var i
  if (typeof value === 'number') {
    for (i = start; i < end; i++) {
      this[i] = value
    }
  } else {
    var bytes = utf8ToBytes(value.toString())
    var len = bytes.length
    for (i = start; i < end; i++) {
      this[i] = bytes[i % len]
    }
  }

  return this
}

/**
 * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
 * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
 */
Buffer.prototype.toArrayBuffer = function toArrayBuffer () {
  if (typeof Uint8Array !== 'undefined') {
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      return (new Buffer(this)).buffer
    } else {
      var buf = new Uint8Array(this.length)
      for (var i = 0, len = buf.length; i < len; i += 1) {
        buf[i] = this[i]
      }
      return buf.buffer
    }
  } else {
    throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
  }
}

// HELPER FUNCTIONS
// ================

var BP = Buffer.prototype

/**
 * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
 */
Buffer._augment = function _augment (arr) {
  arr.constructor = Buffer
  arr._isBuffer = true

  // save reference to original Uint8Array set method before overwriting
  arr._set = arr.set

  // deprecated
  arr.get = BP.get
  arr.set = BP.set

  arr.write = BP.write
  arr.toString = BP.toString
  arr.toLocaleString = BP.toString
  arr.toJSON = BP.toJSON
  arr.equals = BP.equals
  arr.compare = BP.compare
  arr.indexOf = BP.indexOf
  arr.copy = BP.copy
  arr.slice = BP.slice
  arr.readUIntLE = BP.readUIntLE
  arr.readUIntBE = BP.readUIntBE
  arr.readUInt8 = BP.readUInt8
  arr.readUInt16LE = BP.readUInt16LE
  arr.readUInt16BE = BP.readUInt16BE
  arr.readUInt32LE = BP.readUInt32LE
  arr.readUInt32BE = BP.readUInt32BE
  arr.readIntLE = BP.readIntLE
  arr.readIntBE = BP.readIntBE
  arr.readInt8 = BP.readInt8
  arr.readInt16LE = BP.readInt16LE
  arr.readInt16BE = BP.readInt16BE
  arr.readInt32LE = BP.readInt32LE
  arr.readInt32BE = BP.readInt32BE
  arr.readFloatLE = BP.readFloatLE
  arr.readFloatBE = BP.readFloatBE
  arr.readDoubleLE = BP.readDoubleLE
  arr.readDoubleBE = BP.readDoubleBE
  arr.writeUInt8 = BP.writeUInt8
  arr.writeUIntLE = BP.writeUIntLE
  arr.writeUIntBE = BP.writeUIntBE
  arr.writeUInt16LE = BP.writeUInt16LE
  arr.writeUInt16BE = BP.writeUInt16BE
  arr.writeUInt32LE = BP.writeUInt32LE
  arr.writeUInt32BE = BP.writeUInt32BE
  arr.writeIntLE = BP.writeIntLE
  arr.writeIntBE = BP.writeIntBE
  arr.writeInt8 = BP.writeInt8
  arr.writeInt16LE = BP.writeInt16LE
  arr.writeInt16BE = BP.writeInt16BE
  arr.writeInt32LE = BP.writeInt32LE
  arr.writeInt32BE = BP.writeInt32BE
  arr.writeFloatLE = BP.writeFloatLE
  arr.writeFloatBE = BP.writeFloatBE
  arr.writeDoubleLE = BP.writeDoubleLE
  arr.writeDoubleBE = BP.writeDoubleBE
  arr.fill = BP.fill
  arr.inspect = BP.inspect
  arr.toArrayBuffer = BP.toArrayBuffer

  return arr
}

var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function stringtrim (str) {
  if (str.trim) return str.trim()
  return str.replace(/^\s+|\s+$/g, '')
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; i++) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; i++) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"base64-js":4,"ieee754":19,"isarray":8}],8:[function(require,module,exports){
var toString = {}.toString;

module.exports = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

},{}],9:[function(require,module,exports){
'use strict';

var ticky = require('ticky');

module.exports = function debounce (fn, args, ctx) {
  if (!fn) { return; }
  ticky(function run () {
    fn.apply(ctx || null, args || []);
  });
};

},{"ticky":50}],10:[function(require,module,exports){
'use strict';

var atoa = require('atoa');
var debounce = require('./debounce');

module.exports = function emitter (thing, options) {
  var opts = options || {};
  var evt = {};
  if (thing === undefined) { thing = {}; }
  thing.on = function (type, fn) {
    if (!evt[type]) {
      evt[type] = [fn];
    } else {
      evt[type].push(fn);
    }
    return thing;
  };
  thing.once = function (type, fn) {
    fn._once = true; // thing.off(fn) still works!
    thing.on(type, fn);
    return thing;
  };
  thing.off = function (type, fn) {
    var c = arguments.length;
    if (c === 1) {
      delete evt[type];
    } else if (c === 0) {
      evt = {};
    } else {
      var et = evt[type];
      if (!et) { return thing; }
      et.splice(et.indexOf(fn), 1);
    }
    return thing;
  };
  thing.emit = function () {
    var args = atoa(arguments);
    return thing.emitterSnapshot(args.shift()).apply(this, args);
  };
  thing.emitterSnapshot = function (type) {
    var et = (evt[type] || []).slice(0);
    return function () {
      var args = atoa(arguments);
      var ctx = this || thing;
      if (type === 'error' && opts.throws !== false && !et.length) { throw args.length === 1 ? args[0] : args; }
      et.forEach(function emitter (listen) {
        if (opts.async) { debounce(listen, args, ctx); } else { listen.apply(ctx, args); }
        if (listen._once) { thing.off(type, listen); }
      });
      return thing;
    };
  };
  return thing;
};

},{"./debounce":9,"atoa":3}],11:[function(require,module,exports){
(function (Buffer){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.

function isArray(arg) {
  if (Array.isArray) {
    return Array.isArray(arg);
  }
  return objectToString(arg) === '[object Array]';
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = Buffer.isBuffer;

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
},{"../../is-buffer/index.js":21}],12:[function(require,module,exports){
(function (global){
'use strict';

var customEvent = require('custom-event');
var eventmap = require('./eventmap');
var doc = global.document;
var addEvent = addEventEasy;
var removeEvent = removeEventEasy;
var hardCache = [];

if (!global.addEventListener) {
  addEvent = addEventHard;
  removeEvent = removeEventHard;
}

module.exports = {
  add: addEvent,
  remove: removeEvent,
  fabricate: fabricateEvent
};

function addEventEasy (el, type, fn, capturing) {
  return el.addEventListener(type, fn, capturing);
}

function addEventHard (el, type, fn) {
  return el.attachEvent('on' + type, wrap(el, type, fn));
}

function removeEventEasy (el, type, fn, capturing) {
  return el.removeEventListener(type, fn, capturing);
}

function removeEventHard (el, type, fn) {
  var listener = unwrap(el, type, fn);
  if (listener) {
    return el.detachEvent('on' + type, listener);
  }
}

function fabricateEvent (el, type, model) {
  var e = eventmap.indexOf(type) === -1 ? makeCustomEvent() : makeClassicEvent();
  if (el.dispatchEvent) {
    el.dispatchEvent(e);
  } else {
    el.fireEvent('on' + type, e);
  }
  function makeClassicEvent () {
    var e;
    if (doc.createEvent) {
      e = doc.createEvent('Event');
      e.initEvent(type, true, true);
    } else if (doc.createEventObject) {
      e = doc.createEventObject();
    }
    return e;
  }
  function makeCustomEvent () {
    return new customEvent(type, { detail: model });
  }
}

function wrapperFactory (el, type, fn) {
  return function wrapper (originalEvent) {
    var e = originalEvent || global.event;
    e.target = e.target || e.srcElement;
    e.preventDefault = e.preventDefault || function preventDefault () { e.returnValue = false; };
    e.stopPropagation = e.stopPropagation || function stopPropagation () { e.cancelBubble = true; };
    e.which = e.which || e.keyCode;
    fn.call(el, e);
  };
}

function wrap (el, type, fn) {
  var wrapper = unwrap(el, type, fn) || wrapperFactory(el, type, fn);
  hardCache.push({
    wrapper: wrapper,
    element: el,
    type: type,
    fn: fn
  });
  return wrapper;
}

function unwrap (el, type, fn) {
  var i = find(el, type, fn);
  if (i) {
    var wrapper = hardCache[i].wrapper;
    hardCache.splice(i, 1); // free up a tad of memory
    return wrapper;
  }
}

function find (el, type, fn) {
  var i, item;
  for (i = 0; i < hardCache.length; i++) {
    item = hardCache[i];
    if (item.element === el && item.type === type && item.fn === fn) {
      return i;
    }
  }
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./eventmap":13,"custom-event":14}],13:[function(require,module,exports){
(function (global){
'use strict';

var eventmap = [];
var eventname = '';
var ron = /^on/;

for (eventname in global) {
  if (ron.test(eventname)) {
    eventmap.push(eventname.slice(2));
  }
}

module.exports = eventmap;

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],14:[function(require,module,exports){
(function (global){

var NativeCustomEvent = global.CustomEvent;

function useNative () {
  try {
    var p = new NativeCustomEvent('cat', { detail: { foo: 'bar' } });
    return  'cat' === p.type && 'bar' === p.detail.foo;
  } catch (e) {
  }
  return false;
}

/**
 * Cross-browser `CustomEvent` constructor.
 *
 * https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent.CustomEvent
 *
 * @public
 */

module.exports = useNative() ? NativeCustomEvent :

// IE >= 9
'function' === typeof document.createEvent ? function CustomEvent (type, params) {
  var e = document.createEvent('CustomEvent');
  if (params) {
    e.initCustomEvent(type, params.bubbles, params.cancelable, params.detail);
  } else {
    e.initCustomEvent(type, false, false, void 0);
  }
  return e;
} :

// IE <= 8
function CustomEvent (type, params) {
  var e = document.createEventObject();
  e.type = type;
  if (params) {
    e.bubbles = Boolean(params.bubbles);
    e.cancelable = Boolean(params.cancelable);
    e.detail = params.detail;
  } else {
    e.bubbles = false;
    e.cancelable = false;
    e.detail = void 0;
  }
  return e;
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],15:[function(require,module,exports){
var pSlice = Array.prototype.slice;
var objectKeys = require('./lib/keys.js');
var isArguments = require('./lib/is_arguments.js');

var deepEqual = module.exports = function (actual, expected, opts) {
  if (!opts) opts = {};
  // 7.1. All identical values are equivalent, as determined by ===.
  if (actual === expected) {
    return true;

  } else if (actual instanceof Date && expected instanceof Date) {
    return actual.getTime() === expected.getTime();

  // 7.3. Other pairs that do not both pass typeof value == 'object',
  // equivalence is determined by ==.
  } else if (!actual || !expected || typeof actual != 'object' && typeof expected != 'object') {
    return opts.strict ? actual === expected : actual == expected;

  // 7.4. For all other Object pairs, including Array objects, equivalence is
  // determined by having the same number of owned properties (as verified
  // with Object.prototype.hasOwnProperty.call), the same set of keys
  // (although not necessarily the same order), equivalent values for every
  // corresponding key, and an identical 'prototype' property. Note: this
  // accounts for both named and indexed properties on Arrays.
  } else {
    return objEquiv(actual, expected, opts);
  }
}

function isUndefinedOrNull(value) {
  return value === null || value === undefined;
}

function isBuffer (x) {
  if (!x || typeof x !== 'object' || typeof x.length !== 'number') return false;
  if (typeof x.copy !== 'function' || typeof x.slice !== 'function') {
    return false;
  }
  if (x.length > 0 && typeof x[0] !== 'number') return false;
  return true;
}

function objEquiv(a, b, opts) {
  var i, key;
  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
    return false;
  // an identical 'prototype' property.
  if (a.prototype !== b.prototype) return false;
  //~~~I've managed to break Object.keys through screwy arguments passing.
  //   Converting to array solves the problem.
  if (isArguments(a)) {
    if (!isArguments(b)) {
      return false;
    }
    a = pSlice.call(a);
    b = pSlice.call(b);
    return deepEqual(a, b, opts);
  }
  if (isBuffer(a)) {
    if (!isBuffer(b)) {
      return false;
    }
    if (a.length !== b.length) return false;
    for (i = 0; i < a.length; i++) {
      if (a[i] !== b[i]) return false;
    }
    return true;
  }
  try {
    var ka = objectKeys(a),
        kb = objectKeys(b);
  } catch (e) {//happens when one is a string literal and the other isn't
    return false;
  }
  // having the same number of owned properties (keys incorporates
  // hasOwnProperty)
  if (ka.length != kb.length)
    return false;
  //the same set of keys (although not necessarily the same order),
  ka.sort();
  kb.sort();
  //~~~cheap key test
  for (i = ka.length - 1; i >= 0; i--) {
    if (ka[i] != kb[i])
      return false;
  }
  //equivalent values for every corresponding key, and
  //~~~possibly expensive deep test
  for (i = ka.length - 1; i >= 0; i--) {
    key = ka[i];
    if (!deepEqual(a[key], b[key], opts)) return false;
  }
  return typeof a === typeof b;
}

},{"./lib/is_arguments.js":16,"./lib/keys.js":17}],16:[function(require,module,exports){
var supportsArgumentsClass = (function(){
  return Object.prototype.toString.call(arguments)
})() == '[object Arguments]';

exports = module.exports = supportsArgumentsClass ? supported : unsupported;

exports.supported = supported;
function supported(object) {
  return Object.prototype.toString.call(object) == '[object Arguments]';
};

exports.unsupported = unsupported;
function unsupported(object){
  return object &&
    typeof object == 'object' &&
    typeof object.length == 'number' &&
    Object.prototype.hasOwnProperty.call(object, 'callee') &&
    !Object.prototype.propertyIsEnumerable.call(object, 'callee') ||
    false;
};

},{}],17:[function(require,module,exports){
exports = module.exports = typeof Object.keys === 'function'
  ? Object.keys : shim;

exports.shim = shim;
function shim (obj) {
  var keys = [];
  for (var key in obj) keys.push(key);
  return keys;
}

},{}],18:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      }
      throw TypeError('Uncaught, unspecified "error" event.');
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    len = arguments.length;
    args = new Array(len - 1);
    for (i = 1; i < len; i++)
      args[i - 1] = arguments[i];

    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    var m;
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  var ret;
  if (!emitter._events || !emitter._events[type])
    ret = 0;
  else if (isFunction(emitter._events[type]))
    ret = 1;
  else
    ret = emitter._events[type].length;
  return ret;
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],19:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],20:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],21:[function(require,module,exports){
/*!
 * Determine if an object is a Buffer
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */

// The _isBuffer check is for Safari 5-7 support, because it's missing
// Object.prototype.constructor. Remove this eventually
module.exports = function (obj) {
  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
}

function isBuffer (obj) {
  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
}

// For Node v0.10 support. Remove this eventually.
function isSlowBuffer (obj) {
  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
}

},{}],22:[function(require,module,exports){
module.exports = function inspect_ (obj, opts, depth, seen) {
    if (!opts) opts = {};
    
    var maxDepth = opts.depth === undefined ? 5 : opts.depth;
    if (depth === undefined) depth = 0;
    if (depth >= maxDepth && maxDepth > 0
    && obj && typeof obj === 'object') {
        return '[Object]';
    }
    
    if (seen === undefined) seen = [];
    else if (indexOf(seen, obj) >= 0) {
        return '[Circular]';
    }
    
    function inspect (value, from) {
        if (from) {
            seen = seen.slice();
            seen.push(from);
        }
        return inspect_(value, opts, depth + 1, seen);
    }
    
    if (typeof obj === 'string') {
        return inspectString(obj);
    }
    else if (typeof obj === 'function') {
        var name = nameOf(obj);
        return '[Function' + (name ? ': ' + name : '') + ']';
    }
    else if (obj === null) {
        return 'null';
    }
    else if (isSymbol(obj)) {
        var symString = Symbol.prototype.toString.call(obj);
        return typeof obj === 'object' ? 'Object(' + symString + ')' : symString;
    }
    else if (isElement(obj)) {
        var s = '<' + String(obj.nodeName).toLowerCase();
        var attrs = obj.attributes || [];
        for (var i = 0; i < attrs.length; i++) {
            s += ' ' + attrs[i].name + '="' + quote(attrs[i].value) + '"';
        }
        s += '>';
        if (obj.childNodes && obj.childNodes.length) s += '...';
        s += '</' + String(obj.nodeName).toLowerCase() + '>';
        return s;
    }
    else if (isArray(obj)) {
        if (obj.length === 0) return '[]';
        var xs = Array(obj.length);
        for (var i = 0; i < obj.length; i++) {
            xs[i] = has(obj, i) ? inspect(obj[i], obj) : '';
        }
        return '[ ' + xs.join(', ') + ' ]';
    }
    else if (isError(obj)) {
        var parts = [];
        for (var key in obj) {
            if (!has(obj, key)) continue;
            
            if (/[^\w$]/.test(key)) {
                parts.push(inspect(key) + ': ' + inspect(obj[key]));
            }
            else {
                parts.push(key + ': ' + inspect(obj[key]));
            }
        }
        if (parts.length === 0) return '[' + obj + ']';
        return '{ [' + obj + '] ' + parts.join(', ') + ' }';
    }
    else if (typeof obj === 'object' && typeof obj.inspect === 'function') {
        return obj.inspect();
    }
    else if (typeof obj === 'object' && !isDate(obj) && !isRegExp(obj)) {
        var xs = [], keys = [];
        for (var key in obj) {
            if (has(obj, key)) keys.push(key);
        }
        keys.sort();
        for (var i = 0; i < keys.length; i++) {
            var key = keys[i];
            if (/[^\w$]/.test(key)) {
                xs.push(inspect(key) + ': ' + inspect(obj[key], obj));
            }
            else xs.push(key + ': ' + inspect(obj[key], obj));
        }
        if (xs.length === 0) return '{}';
        return '{ ' + xs.join(', ') + ' }';
    }
    else return String(obj);
};

function quote (s) {
    return String(s).replace(/"/g, '&quot;');
}

function isArray (obj) { return toStr(obj) === '[object Array]' }
function isDate (obj) { return toStr(obj) === '[object Date]' }
function isRegExp (obj) { return toStr(obj) === '[object RegExp]' }
function isError (obj) { return toStr(obj) === '[object Error]' }
function isSymbol (obj) { return toStr(obj) === '[object Symbol]' }

var hasOwn = Object.prototype.hasOwnProperty || function (key) { return key in this; };
function has (obj, key) {
    return hasOwn.call(obj, key);
}

function toStr (obj) {
    return Object.prototype.toString.call(obj);
}

function nameOf (f) {
    if (f.name) return f.name;
    var m = f.toString().match(/^function\s*([\w$]+)/);
    if (m) return m[1];
}

function indexOf (xs, x) {
    if (xs.indexOf) return xs.indexOf(x);
    for (var i = 0, l = xs.length; i < l; i++) {
        if (xs[i] === x) return i;
    }
    return -1;
}

function isElement (x) {
    if (!x || typeof x !== 'object') return false;
    if (typeof HTMLElement !== 'undefined' && x instanceof HTMLElement) {
        return true;
    }
    return typeof x.nodeName === 'string'
        && typeof x.getAttribute === 'function'
    ;
}

function inspectString (str) {
    var s = str.replace(/(['\\])/g, '\\$1').replace(/[\x00-\x1f]/g, lowbyte);
    return "'" + s + "'";
    
    function lowbyte (c) {
        var n = c.charCodeAt(0);
        var x = { 8: 'b', 9: 't', 10: 'n', 12: 'f', 13: 'r' }[n];
        if (x) return '\\' + x;
        return '\\x' + (n < 0x10 ? '0' : '') + n.toString(16);
    }
}

},{}],23:[function(require,module,exports){
(function (process){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = parts.length - 1; i >= 0; i--) {
    var last = parts[i];
    if (last === '.') {
      parts.splice(i, 1);
    } else if (last === '..') {
      parts.splice(i, 1);
      up++;
    } else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}

// Split a filename into [root, dir, basename, ext], unix version
// 'root' is just a slash, or nothing.
var splitPathRe =
    /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
var splitPath = function(filename) {
  return splitPathRe.exec(filename).slice(1);
};

// path.resolve([from ...], to)
// posix version
exports.resolve = function() {
  var resolvedPath = '',
      resolvedAbsolute = false;

  for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
    var path = (i >= 0) ? arguments[i] : process.cwd();

    // Skip empty and invalid entries
    if (typeof path !== 'string') {
      throw new TypeError('Arguments to path.resolve must be strings');
    } else if (!path) {
      continue;
    }

    resolvedPath = path + '/' + resolvedPath;
    resolvedAbsolute = path.charAt(0) === '/';
  }

  // At this point the path should be resolved to a full absolute path, but
  // handle relative paths to be safe (might happen when process.cwd() fails)

  // Normalize the path
  resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
    return !!p;
  }), !resolvedAbsolute).join('/');

  return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
};

// path.normalize(path)
// posix version
exports.normalize = function(path) {
  var isAbsolute = exports.isAbsolute(path),
      trailingSlash = substr(path, -1) === '/';

  // Normalize the path
  path = normalizeArray(filter(path.split('/'), function(p) {
    return !!p;
  }), !isAbsolute).join('/');

  if (!path && !isAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isAbsolute ? '/' : '') + path;
};

// posix version
exports.isAbsolute = function(path) {
  return path.charAt(0) === '/';
};

// posix version
exports.join = function() {
  var paths = Array.prototype.slice.call(arguments, 0);
  return exports.normalize(filter(paths, function(p, index) {
    if (typeof p !== 'string') {
      throw new TypeError('Arguments to path.join must be strings');
    }
    return p;
  }).join('/'));
};


// path.relative(from, to)
// posix version
exports.relative = function(from, to) {
  from = exports.resolve(from).substr(1);
  to = exports.resolve(to).substr(1);

  function trim(arr) {
    var start = 0;
    for (; start < arr.length; start++) {
      if (arr[start] !== '') break;
    }

    var end = arr.length - 1;
    for (; end >= 0; end--) {
      if (arr[end] !== '') break;
    }

    if (start > end) return [];
    return arr.slice(start, end - start + 1);
  }

  var fromParts = trim(from.split('/'));
  var toParts = trim(to.split('/'));

  var length = Math.min(fromParts.length, toParts.length);
  var samePartsLength = length;
  for (var i = 0; i < length; i++) {
    if (fromParts[i] !== toParts[i]) {
      samePartsLength = i;
      break;
    }
  }

  var outputParts = [];
  for (var i = samePartsLength; i < fromParts.length; i++) {
    outputParts.push('..');
  }

  outputParts = outputParts.concat(toParts.slice(samePartsLength));

  return outputParts.join('/');
};

exports.sep = '/';
exports.delimiter = ':';

exports.dirname = function(path) {
  var result = splitPath(path),
      root = result[0],
      dir = result[1];

  if (!root && !dir) {
    // No dirname whatsoever
    return '.';
  }

  if (dir) {
    // It has a dirname, strip trailing slash
    dir = dir.substr(0, dir.length - 1);
  }

  return root + dir;
};


exports.basename = function(path, ext) {
  var f = splitPath(path)[2];
  // TODO: make this comparison case-insensitive on windows?
  if (ext && f.substr(-1 * ext.length) === ext) {
    f = f.substr(0, f.length - ext.length);
  }
  return f;
};


exports.extname = function(path) {
  return splitPath(path)[3];
};

function filter (xs, f) {
    if (xs.filter) return xs.filter(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
        if (f(xs[i], i, xs)) res.push(xs[i]);
    }
    return res;
}

// String.prototype.substr - negative index don't work in IE8
var substr = 'ab'.substr(-1) === 'b'
    ? function (str, start, len) { return str.substr(start, len) }
    : function (str, start, len) {
        if (start < 0) start = str.length + start;
        return str.substr(start, len);
    }
;

}).call(this,require('_process'))
},{"_process":25}],24:[function(require,module,exports){
(function (process){
'use strict';

if (!process.version ||
    process.version.indexOf('v0.') === 0 ||
    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
  module.exports = { nextTick: nextTick };
} else {
  module.exports = process
}

function nextTick(fn, arg1, arg2, arg3) {
  if (typeof fn !== 'function') {
    throw new TypeError('"callback" argument must be a function');
  }
  var len = arguments.length;
  var args, i;
  switch (len) {
  case 0:
  case 1:
    return process.nextTick(fn);
  case 2:
    return process.nextTick(function afterTickOne() {
      fn.call(null, arg1);
    });
  case 3:
    return process.nextTick(function afterTickTwo() {
      fn.call(null, arg1, arg2);
    });
  case 4:
    return process.nextTick(function afterTickThree() {
      fn.call(null, arg1, arg2, arg3);
    });
  default:
    args = new Array(len - 1);
    i = 0;
    while (i < args.length) {
      args[i++] = arguments[i];
    }
    return process.nextTick(function afterTick() {
      fn.apply(null, args);
    });
  }
}


}).call(this,require('_process'))
},{"_process":25}],25:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
(function () {
    try {
        if (typeof setTimeout === 'function') {
            cachedSetTimeout = setTimeout;
        } else {
            cachedSetTimeout = defaultSetTimout;
        }
    } catch (e) {
        cachedSetTimeout = defaultSetTimout;
    }
    try {
        if (typeof clearTimeout === 'function') {
            cachedClearTimeout = clearTimeout;
        } else {
            cachedClearTimeout = defaultClearTimeout;
        }
    } catch (e) {
        cachedClearTimeout = defaultClearTimeout;
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) { return [] }

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],26:[function(require,module,exports){
(function (process){
var through = require('through');
var nextTick = typeof setImmediate !== 'undefined'
    ? setImmediate
    : process.nextTick
;

module.exports = function (write, end) {
    var tr = through(write, end);
    tr.pause();
    var resume = tr.resume;
    var pause = tr.pause;
    var paused = false;
    
    tr.pause = function () {
        paused = true;
        return pause.apply(this, arguments);
    };
    
    tr.resume = function () {
        paused = false;
        return resume.apply(this, arguments);
    };
    
    nextTick(function () {
        if (!paused) tr.resume();
    });
    
    return tr;
};

}).call(this,require('_process'))
},{"_process":25,"through":49}],27:[function(require,module,exports){
/* eslint-disable node/no-deprecated-api */
var buffer = require('buffer')
var Buffer = buffer.Buffer

// alternative to using Object.keys for old browsers
function copyProps (src, dst) {
  for (var key in src) {
    dst[key] = src[key]
  }
}
if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
  module.exports = buffer
} else {
  // Copy properties from require('buffer')
  copyProps(buffer, exports)
  exports.Buffer = SafeBuffer
}

function SafeBuffer (arg, encodingOrOffset, length) {
  return Buffer(arg, encodingOrOffset, length)
}

// Copy static methods from Buffer
copyProps(Buffer, SafeBuffer)

SafeBuffer.from = function (arg, encodingOrOffset, length) {
  if (typeof arg === 'number') {
    throw new TypeError('Argument must not be a number')
  }
  return Buffer(arg, encodingOrOffset, length)
}

SafeBuffer.alloc = function (size, fill, encoding) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  var buf = Buffer(size)
  if (fill !== undefined) {
    if (typeof encoding === 'string') {
      buf.fill(fill, encoding)
    } else {
      buf.fill(fill)
    }
  } else {
    buf.fill(0)
  }
  return buf
}

SafeBuffer.allocUnsafe = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return Buffer(size)
}

SafeBuffer.allocUnsafeSlow = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return buffer.SlowBuffer(size)
}

},{"buffer":7}],28:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

module.exports = Stream;

var EE = require('events').EventEmitter;
var inherits = require('inherits');

inherits(Stream, EE);
Stream.Readable = require('readable-stream/readable.js');
Stream.Writable = require('readable-stream/writable.js');
Stream.Duplex = require('readable-stream/duplex.js');
Stream.Transform = require('readable-stream/transform.js');
Stream.PassThrough = require('readable-stream/passthrough.js');

// Backwards-compat with node 0.4.x
Stream.Stream = Stream;



// old-style streams.  Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.

function Stream() {
  EE.call(this);
}

Stream.prototype.pipe = function(dest, options) {
  var source = this;

  function ondata(chunk) {
    if (dest.writable) {
      if (false === dest.write(chunk) && source.pause) {
        source.pause();
      }
    }
  }

  source.on('data', ondata);

  function ondrain() {
    if (source.readable && source.resume) {
      source.resume();
    }
  }

  dest.on('drain', ondrain);

  // If the 'end' option is not supplied, dest.end() will be called when
  // source gets the 'end' or 'close' events.  Only dest.end() once.
  if (!dest._isStdio && (!options || options.end !== false)) {
    source.on('end', onend);
    source.on('close', onclose);
  }

  var didOnEnd = false;
  function onend() {
    if (didOnEnd) return;
    didOnEnd = true;

    dest.end();
  }


  function onclose() {
    if (didOnEnd) return;
    didOnEnd = true;

    if (typeof dest.destroy === 'function') dest.destroy();
  }

  // don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    if (EE.listenerCount(this, 'error') === 0) {
      throw er; // Unhandled stream error in pipe.
    }
  }

  source.on('error', onerror);
  dest.on('error', onerror);

  // remove all the event listeners that were added.
  function cleanup() {
    source.removeListener('data', ondata);
    dest.removeListener('drain', ondrain);

    source.removeListener('end', onend);
    source.removeListener('close', onclose);

    source.removeListener('error', onerror);
    dest.removeListener('error', onerror);

    source.removeListener('end', cleanup);
    source.removeListener('close', cleanup);

    dest.removeListener('close', cleanup);
  }

  source.on('end', cleanup);
  source.on('close', cleanup);

  dest.on('close', cleanup);

  dest.emit('pipe', source);

  // Allow for unix-like usage: A.pipe(B).pipe(C)
  return dest;
};

},{"events":18,"inherits":20,"readable-stream/duplex.js":30,"readable-stream/passthrough.js":39,"readable-stream/readable.js":40,"readable-stream/transform.js":41,"readable-stream/writable.js":42}],29:[function(require,module,exports){
arguments[4][8][0].apply(exports,arguments)
},{"dup":8}],30:[function(require,module,exports){
module.exports = require('./lib/_stream_duplex.js');

},{"./lib/_stream_duplex.js":31}],31:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.

'use strict';

/*<replacement>*/

var pna = require('process-nextick-args');
/*</replacement>*/

/*<replacement>*/
var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) {
    keys.push(key);
  }return keys;
};
/*</replacement>*/

module.exports = Duplex;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

var Readable = require('./_stream_readable');
var Writable = require('./_stream_writable');

util.inherits(Duplex, Readable);

var keys = objectKeys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
  var method = keys[v];
  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}

function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false) this.readable = false;

  if (options && options.writable === false) this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended) return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  pna.nextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

Object.defineProperty(Duplex.prototype, 'destroyed', {
  get: function () {
    if (this._readableState === undefined || this._writableState === undefined) {
      return false;
    }
    return this._readableState.destroyed && this._writableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (this._readableState === undefined || this._writableState === undefined) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._readableState.destroyed = value;
    this._writableState.destroyed = value;
  }
});

Duplex.prototype._destroy = function (err, cb) {
  this.push(null);
  this.end();

  pna.nextTick(cb, err);
};

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}
},{"./_stream_readable":33,"./_stream_writable":35,"core-util-is":11,"inherits":20,"process-nextick-args":24}],32:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.

'use strict';

module.exports = PassThrough;

var Transform = require('./_stream_transform');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(PassThrough, Transform);

function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};
},{"./_stream_transform":34,"core-util-is":11,"inherits":20}],33:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

/*<replacement>*/

var pna = require('process-nextick-args');
/*</replacement>*/

module.exports = Readable;

/*<replacement>*/
var isArray = require('isarray');
/*</replacement>*/

/*<replacement>*/
var Duplex;
/*</replacement>*/

Readable.ReadableState = ReadableState;

/*<replacement>*/
var EE = require('events').EventEmitter;

var EElistenerCount = function (emitter, type) {
  return emitter.listeners(type).length;
};
/*</replacement>*/

/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/

/*<replacement>*/

var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}
function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}

/*</replacement>*/

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var debugUtil = require('util');
var debug = void 0;
if (debugUtil && debugUtil.debuglog) {
  debug = debugUtil.debuglog('stream');
} else {
  debug = function () {};
}
/*</replacement>*/

var BufferList = require('./internal/streams/BufferList');
var destroyImpl = require('./internal/streams/destroy');
var StringDecoder;

util.inherits(Readable, Stream);

var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

function prependListener(emitter, event, fn) {
  // Sadly this is not cacheable as some libraries bundle their own
  // event emitter implementation with them.
  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);

  // This is a hack to make sure that our error handler is attached before any
  // userland ones.  NEVER DO THIS. This is here only because this code needs
  // to continue to work with older versions of Node.js that do not include
  // the prependListener() method. The goal is to eventually remove this hack.
  if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
}

function ReadableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // Duplex streams are both readable and writable, but share
  // the same options object.
  // However, some cases require setting options to different
  // values for the readable and the writable sides of the duplex stream.
  // These options can be provided separately as readableXXX and writableXXX.
  var isDuplex = stream instanceof Duplex;

  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  var readableHwm = options.readableHighWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;

  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;

  // cast to ints.
  this.highWaterMark = Math.floor(this.highWaterMark);

  // A linked list is used to store data chunks instead of an array because the
  // linked list can remove elements from the beginning faster than
  // array.shift()
  this.buffer = new BufferList();
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // a flag to be able to tell if the event 'readable'/'data' is emitted
  // immediately, or on a later tick.  We set this to true at first, because
  // any actions that shouldn't happen until "later" should generally also
  // not happen before the first read call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;

  // has it been destroyed
  this.destroyed = false;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}

function Readable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  if (!(this instanceof Readable)) return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  if (options) {
    if (typeof options.read === 'function') this._read = options.read;

    if (typeof options.destroy === 'function') this._destroy = options.destroy;
  }

  Stream.call(this);
}

Object.defineProperty(Readable.prototype, 'destroyed', {
  get: function () {
    if (this._readableState === undefined) {
      return false;
    }
    return this._readableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._readableState) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._readableState.destroyed = value;
  }
});

Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;
Readable.prototype._destroy = function (err, cb) {
  this.push(null);
  cb(err);
};

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;
  var skipChunkCheck;

  if (!state.objectMode) {
    if (typeof chunk === 'string') {
      encoding = encoding || state.defaultEncoding;
      if (encoding !== state.encoding) {
        chunk = Buffer.from(chunk, encoding);
        encoding = '';
      }
      skipChunkCheck = true;
    }
  } else {
    skipChunkCheck = true;
  }

  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
  return readableAddChunk(this, chunk, null, true, false);
};

function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
  var state = stream._readableState;
  if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else {
    var er;
    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
    if (er) {
      stream.emit('error', er);
    } else if (state.objectMode || chunk && chunk.length > 0) {
      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
        chunk = _uint8ArrayToBuffer(chunk);
      }

      if (addToFront) {
        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
      } else if (state.ended) {
        stream.emit('error', new Error('stream.push() after EOF'));
      } else {
        state.reading = false;
        if (state.decoder && !encoding) {
          chunk = state.decoder.write(chunk);
          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
        } else {
          addChunk(stream, state, chunk, false);
        }
      }
    } else if (!addToFront) {
      state.reading = false;
    }
  }

  return needMoreData(state);
}

function addChunk(stream, state, chunk, addToFront) {
  if (state.flowing && state.length === 0 && !state.sync) {
    stream.emit('data', chunk);
    stream.read(0);
  } else {
    // update the buffer info.
    state.length += state.objectMode ? 1 : chunk.length;
    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);

    if (state.needReadable) emitReadable(stream);
  }
  maybeReadMore(stream, state);
}

function chunkInvalid(state, chunk) {
  var er;
  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}

// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
};

// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
  return this;
};

// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
  if (n <= 0 || state.length === 0 && state.ended) return 0;
  if (state.objectMode) return 1;
  if (n !== n) {
    // Only flow one buffer at a time
    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
  }
  // If we're asking for more than the current hwm, then raise the hwm.
  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
  if (n <= state.length) return n;
  // Don't have enough
  if (!state.ended) {
    state.needReadable = true;
    return 0;
  }
  return state.length;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
  debug('read', n);
  n = parseInt(n, 10);
  var state = this._readableState;
  var nOrig = n;

  if (n !== 0) state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
    debug('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;
  debug('need readable', doRead);

  // if we currently have less than the highWaterMark, then also read some
  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug('length less than watermark', doRead);
  }

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading) {
    doRead = false;
    debug('reading or ended', doRead);
  } else if (doRead) {
    debug('do read');
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0) state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
    // If _read pushed data synchronously, then `reading` will be false,
    // and we need to re-evaluate how much data we can return to the user.
    if (!state.reading) n = howMuchToRead(nOrig, state);
  }

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  } else {
    state.length -= n;
  }

  if (state.length === 0) {
    // If we have nothing in the buffer, then we want to know
    // as soon as we *do* get something into the buffer.
    if (!state.ended) state.needReadable = true;

    // If we tried to read() past the EOF, then emit end on the next tick.
    if (nOrig !== n && state.ended) endReadable(this);
  }

  if (ret !== null) this.emit('data', ret);

  return ret;
};

function onEofChunk(stream, state) {
  if (state.ended) return;
  if (state.decoder) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // emit 'readable' now to make sure it gets picked up.
  emitReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (!state.emittedReadable) {
    debug('emitReadable', state.flowing);
    state.emittedReadable = true;
    if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);
  }
}

function emitReadable_(stream) {
  debug('emit readable');
  stream.emit('readable');
  flow(stream);
}

// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    pna.nextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
    debug('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;else len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
  this.emit('error', new Error('_read() is not implemented'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;
  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;

  var endFn = doEnd ? onend : unpipe;
  if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable, unpipeInfo) {
    debug('onunpipe');
    if (readable === src) {
      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
        unpipeInfo.hasUnpiped = true;
        cleanup();
      }
    }
  }

  function onend() {
    debug('onend');
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  var cleanedUp = false;
  function cleanup() {
    debug('cleanup');
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', unpipe);
    src.removeListener('data', ondata);

    cleanedUp = true;

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  // If the user pushes more data while we're writing to dest then we'll end up
  // in ondata again. However, we only want to increase awaitDrain once because
  // dest will only emit one 'drain' event for the multiple writes.
  // => Introduce a guard on increasing awaitDrain.
  var increasedAwaitDrain = false;
  src.on('data', ondata);
  function ondata(chunk) {
    debug('ondata');
    increasedAwaitDrain = false;
    var ret = dest.write(chunk);
    if (false === ret && !increasedAwaitDrain) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      // => Check whether `dest` is still a piping destination.
      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
        debug('false write response, pause', src._readableState.awaitDrain);
        src._readableState.awaitDrain++;
        increasedAwaitDrain = true;
      }
      src.pause();
    }
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    debug('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
  }

  // Make sure our error handler is attached before userland ones.
  prependListener(dest, 'error', onerror);

  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    debug('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    debug('unpipe');
    src.unpipe(dest);
  }

  // tell the dest that it's being piped to
  dest.emit('pipe', src);

  // start the flow if it hasn't been started already.
  if (!state.flowing) {
    debug('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function () {
    var state = src._readableState;
    debug('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;
    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;
  var unpipeInfo = { hasUnpiped: false };

  // if we're not piping anywhere, then do nothing.
  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.
  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;

    if (!dest) dest = state.pipes;

    // got a match.
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this, unpipeInfo);
    return this;
  }

  // slow case. multiple pipe destinations.

  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var i = 0; i < len; i++) {
      dests[i].emit('unpipe', this, unpipeInfo);
    }return this;
  }

  // try to find the right one.
  var index = indexOf(state.pipes, dest);
  if (index === -1) return this;

  state.pipes.splice(index, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];

  dest.emit('unpipe', this, unpipeInfo);

  return this;
};

// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
  var res = Stream.prototype.on.call(this, ev, fn);

  if (ev === 'data') {
    // Start flowing on next tick if stream isn't explicitly paused
    if (this._readableState.flowing !== false) this.resume();
  } else if (ev === 'readable') {
    var state = this._readableState;
    if (!state.endEmitted && !state.readableListening) {
      state.readableListening = state.needReadable = true;
      state.emittedReadable = false;
      if (!state.reading) {
        pna.nextTick(nReadingNextTick, this);
      } else if (state.length) {
        emitReadable(this);
      }
    }
  }

  return res;
};
Readable.prototype.addListener = Readable.prototype.on;

function nReadingNextTick(self) {
  debug('readable nexttick read 0');
  self.read(0);
}

// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
  var state = this._readableState;
  if (!state.flowing) {
    debug('resume');
    state.flowing = true;
    resume(this, state);
  }
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    pna.nextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  if (!state.reading) {
    debug('resume read 0');
    stream.read(0);
  }

  state.resumeScheduled = false;
  state.awaitDrain = 0;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug('call pause flowing=%j', this._readableState.flowing);
  if (false !== this._readableState.flowing) {
    debug('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug('flow', state.flowing);
  while (state.flowing && stream.read() !== null) {}
}

// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
  var _this = this;

  var state = this._readableState;
  var paused = false;

  stream.on('end', function () {
    debug('wrapped end');
    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) _this.push(chunk);
    }

    _this.push(null);
  });

  stream.on('data', function (chunk) {
    debug('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk);

    // don't skip over falsy values in objectMode
    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = _this.push(chunk);
    if (!ret) {
      paused = true;
      stream.pause();
    }
  });

  // proxy all the other methods.
  // important when wrapping filters and duplexes.
  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function (method) {
        return function () {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  }

  // proxy certain important events.
  for (var n = 0; n < kProxyEvents.length; n++) {
    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
  }

  // when we try to consume some more bytes, simply unpause the
  // underlying stream.
  this._read = function (n) {
    debug('wrapped _read', n);
    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return this;
};

// exposed for testing purposes only.
Readable._fromList = fromList;

// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
  // nothing buffered
  if (state.length === 0) return null;

  var ret;
  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
    // read it all, truncate the list
    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
    state.buffer.clear();
  } else {
    // read part of list
    ret = fromListPartial(n, state.buffer, state.decoder);
  }

  return ret;
}

// Extracts only enough buffered data to satisfy the amount requested.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromListPartial(n, list, hasStrings) {
  var ret;
  if (n < list.head.data.length) {
    // slice is the same for buffers and strings
    ret = list.head.data.slice(0, n);
    list.head.data = list.head.data.slice(n);
  } else if (n === list.head.data.length) {
    // first chunk is a perfect match
    ret = list.shift();
  } else {
    // result spans more than one buffer
    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
  }
  return ret;
}

// Copies a specified amount of characters from the list of buffered data
// chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBufferString(n, list) {
  var p = list.head;
  var c = 1;
  var ret = p.data;
  n -= ret.length;
  while (p = p.next) {
    var str = p.data;
    var nb = n > str.length ? str.length : n;
    if (nb === str.length) ret += str;else ret += str.slice(0, n);
    n -= nb;
    if (n === 0) {
      if (nb === str.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = str.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

// Copies a specified amount of bytes from the list of buffered data chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBuffer(n, list) {
  var ret = Buffer.allocUnsafe(n);
  var p = list.head;
  var c = 1;
  p.data.copy(ret);
  n -= p.data.length;
  while (p = p.next) {
    var buf = p.data;
    var nb = n > buf.length ? buf.length : n;
    buf.copy(ret, ret.length - n, 0, nb);
    n -= nb;
    if (n === 0) {
      if (nb === buf.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = buf.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;

  // If we get here before consuming all the bytes, then that is a
  // bug in node.  Should never happen.
  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');

  if (!state.endEmitted) {
    state.ended = true;
    pna.nextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  // Check that we didn't get one last unshift.
  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');
  }
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }
  return -1;
}
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./_stream_duplex":31,"./internal/streams/BufferList":36,"./internal/streams/destroy":37,"./internal/streams/stream":38,"_process":25,"core-util-is":11,"events":18,"inherits":20,"isarray":29,"process-nextick-args":24,"safe-buffer":27,"string_decoder/":43,"util":5}],34:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a transform stream is a readable/writable stream where you do
// something with the data.  Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored.  (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation.  For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes.  When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up.  When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer.  When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks.  If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk.  However,
// a pathological inflate type of transform can cause excessive buffering
// here.  For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output.  In this case, you could write a very small
// amount of input, and end up with a very large amount of output.  In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform.  A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.

'use strict';

module.exports = Transform;

var Duplex = require('./_stream_duplex');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(Transform, Duplex);

function afterTransform(er, data) {
  var ts = this._transformState;
  ts.transforming = false;

  var cb = ts.writecb;

  if (!cb) {
    return this.emit('error', new Error('write callback called multiple times'));
  }

  ts.writechunk = null;
  ts.writecb = null;

  if (data != null) // single equals check for both `null` and `undefined`
    this.push(data);

  cb(er);

  var rs = this._readableState;
  rs.reading = false;
  if (rs.needReadable || rs.length < rs.highWaterMark) {
    this._read(rs.highWaterMark);
  }
}

function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);

  Duplex.call(this, options);

  this._transformState = {
    afterTransform: afterTransform.bind(this),
    needTransform: false,
    transforming: false,
    writecb: null,
    writechunk: null,
    writeencoding: null
  };

  // start out asking for a readable event once data is transformed.
  this._readableState.needReadable = true;

  // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.
  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;

    if (typeof options.flush === 'function') this._flush = options.flush;
  }

  // When the writable side finishes, then flush out anything remaining.
  this.on('prefinish', prefinish);
}

function prefinish() {
  var _this = this;

  if (typeof this._flush === 'function') {
    this._flush(function (er, data) {
      done(_this, er, data);
    });
  } else {
    done(this, null, null);
  }
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
};

// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
  throw new Error('_transform() is not implemented');
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;
  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
};

// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
    ts.transforming = true;
    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

Transform.prototype._destroy = function (err, cb) {
  var _this2 = this;

  Duplex.prototype._destroy.call(this, err, function (err2) {
    cb(err2);
    _this2.emit('close');
  });
};

function done(stream, er, data) {
  if (er) return stream.emit('error', er);

  if (data != null) // single equals check for both `null` and `undefined`
    stream.push(data);

  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided
  if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');

  if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');

  return stream.push(null);
}
},{"./_stream_duplex":31,"core-util-is":11,"inherits":20}],35:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.

'use strict';

/*<replacement>*/

var pna = require('process-nextick-args');
/*</replacement>*/

module.exports = Writable;

/* <replacement> */
function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
}

// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;
  this.finish = function () {
    onCorkedFinish(_this, state);
  };
}
/* </replacement> */

/*<replacement>*/
var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
/*</replacement>*/

/*<replacement>*/
var Duplex;
/*</replacement>*/

Writable.WritableState = WritableState;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var internalUtil = {
  deprecate: require('util-deprecate')
};
/*</replacement>*/

/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/

/*<replacement>*/

var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}
function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}

/*</replacement>*/

var destroyImpl = require('./internal/streams/destroy');

util.inherits(Writable, Stream);

function nop() {}

function WritableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // Duplex streams are both readable and writable, but share
  // the same options object.
  // However, some cases require setting options to different
  // values for the readable and the writable sides of the duplex stream.
  // These options can be provided separately as readableXXX and writableXXX.
  var isDuplex = stream instanceof Duplex;

  // object stream flag to indicate whether or not this stream
  // contains buffers or objects.
  this.objectMode = !!options.objectMode;

  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

  // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()
  var hwm = options.highWaterMark;
  var writableHwm = options.writableHighWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;

  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;

  // cast to ints.
  this.highWaterMark = Math.floor(this.highWaterMark);

  // if _final has been called
  this.finalCalled = false;

  // drain event flag.
  this.needDrain = false;
  // at the start of calling end()
  this.ending = false;
  // when end() has been called, and returned
  this.ended = false;
  // when 'finish' is emitted
  this.finished = false;

  // has it been destroyed
  this.destroyed = false;

  // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.
  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.
  this.length = 0;

  // a flag to see when we're in the middle of a write.
  this.writing = false;

  // when true all writes will be buffered until .uncork() call
  this.corked = 0;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.
  this.bufferProcessing = false;

  // the callback that's passed to _write(chunk,cb)
  this.onwrite = function (er) {
    onwrite(stream, er);
  };

  // the callback that the user supplies to write(chunk,encoding,cb)
  this.writecb = null;

  // the amount that is being written when _write is called.
  this.writelen = 0;

  this.bufferedRequest = null;
  this.lastBufferedRequest = null;

  // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted
  this.pendingcb = 0;

  // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams
  this.prefinished = false;

  // True if the error was already emitted and should not be thrown again
  this.errorEmitted = false;

  // count buffered requests
  this.bufferedRequestCount = 0;

  // allocate the first CorkedRequest, there is always
  // one allocated and free to use, and we maintain at most two
  this.corkedRequestsFree = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function getBuffer() {
  var current = this.bufferedRequest;
  var out = [];
  while (current) {
    out.push(current);
    current = current.next;
  }
  return out;
};

(function () {
  try {
    Object.defineProperty(WritableState.prototype, 'buffer', {
      get: internalUtil.deprecate(function () {
        return this.getBuffer();
      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
    });
  } catch (_) {}
})();

// Test _writableState for inheritance to account for Duplex streams,
// whose prototype chain only points to Readable.
var realHasInstance;
if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
  realHasInstance = Function.prototype[Symbol.hasInstance];
  Object.defineProperty(Writable, Symbol.hasInstance, {
    value: function (object) {
      if (realHasInstance.call(this, object)) return true;
      if (this !== Writable) return false;

      return object && object._writableState instanceof WritableState;
    }
  });
} else {
  realHasInstance = function (object) {
    return object instanceof this;
  };
}

function Writable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  // Writable ctor is applied to Duplexes, too.
  // `realHasInstance` is necessary because using plain `instanceof`
  // would return false, as no `_writableState` property is attached.

  // Trying to use the custom `instanceof` for Writable here will also break the
  // Node.js LazyTransform implementation, which has a non-trivial getter for
  // `_writableState` that would lead to infinite recursion.
  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
    return new Writable(options);
  }

  this._writableState = new WritableState(options, this);

  // legacy.
  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;

    if (typeof options.writev === 'function') this._writev = options.writev;

    if (typeof options.destroy === 'function') this._destroy = options.destroy;

    if (typeof options.final === 'function') this._final = options.final;
  }

  Stream.call(this);
}

// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
  this.emit('error', new Error('Cannot pipe, not readable'));
};

function writeAfterEnd(stream, cb) {
  var er = new Error('write after end');
  // TODO: defer error events consistently everywhere, not just the cb
  stream.emit('error', er);
  pna.nextTick(cb, er);
}

// Checks that a user-supplied chunk is valid, especially for the particular
// mode the stream is in. Currently this means that `null` is never accepted
// and undefined/non-string values are only allowed in object mode.
function validChunk(stream, state, chunk, cb) {
  var valid = true;
  var er = false;

  if (chunk === null) {
    er = new TypeError('May not write null values to stream');
  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  if (er) {
    stream.emit('error', er);
    pna.nextTick(cb, er);
    valid = false;
  }
  return valid;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;
  var isBuf = !state.objectMode && _isUint8Array(chunk);

  if (isBuf && !Buffer.isBuffer(chunk)) {
    chunk = _uint8ArrayToBuffer(chunk);
  }

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;

  if (typeof cb !== 'function') cb = nop;

  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
  }

  return ret;
};

Writable.prototype.cork = function () {
  var state = this._writableState;

  state.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;

    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
  this._writableState.defaultEncoding = encoding;
  return this;
};

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = Buffer.from(chunk, encoding);
  }
  return chunk;
}

// if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
  if (!isBuf) {
    var newChunk = decodeChunk(state, chunk, encoding);
    if (chunk !== newChunk) {
      isBuf = true;
      encoding = 'buffer';
      chunk = newChunk;
    }
  }
  var len = state.objectMode ? 1 : chunk.length;

  state.length += len;

  var ret = state.length < state.highWaterMark;
  // we must ensure that previous needDrain will not be reset to false.
  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = {
      chunk: chunk,
      encoding: encoding,
      isBuf: isBuf,
      callback: cb,
      next: null
    };
    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }
    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;

  if (sync) {
    // defer the callback if we are being called synchronously
    // to avoid piling up things on the stack
    pna.nextTick(cb, er);
    // this can emit finish, and it will always happen
    // after error
    pna.nextTick(finishMaybe, stream, state);
    stream._writableState.errorEmitted = true;
    stream.emit('error', er);
  } else {
    // the caller expect this to happen before if
    // it is async
    cb(er);
    stream._writableState.errorEmitted = true;
    stream.emit('error', er);
    // this can emit finish, but finish must
    // always follow error
    finishMaybe(stream, state);
  }
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;

  onwriteStateUpdate(state);

  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state);

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      /*<replacement>*/
      asyncWrite(afterWrite, stream, state, finished, cb);
      /*</replacement>*/
    } else {
      afterWrite(stream, state, finished, cb);
    }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
}

// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
}

// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;

    var count = 0;
    var allBuffers = true;
    while (entry) {
      buffer[count] = entry;
      if (!entry.isBuf) allBuffers = false;
      entry = entry.next;
      count += 1;
    }
    buffer.allBuffers = allBuffers;

    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

    // doWrite is almost always async, defer these to save a bit of time
    // as the hot path ends with doWrite
    state.pendingcb++;
    state.lastBufferedRequest = null;
    if (holder.next) {
      state.corkedRequestsFree = holder.next;
      holder.next = null;
    } else {
      state.corkedRequestsFree = new CorkedRequest(state);
    }
    state.bufferedRequestCount = 0;
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;

      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      state.bufferedRequestCount--;
      // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.
      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new Error('_write() is not implemented'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

  // .end() fully uncorks
  if (state.corked) {
    state.corked = 1;
    this.uncork();
  }

  // ignore unnecessary end() calls.
  if (!state.ending && !state.finished) endWritable(this, state, cb);
};

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}
function callFinal(stream, state) {
  stream._final(function (err) {
    state.pendingcb--;
    if (err) {
      stream.emit('error', err);
    }
    state.prefinished = true;
    stream.emit('prefinish');
    finishMaybe(stream, state);
  });
}
function prefinish(stream, state) {
  if (!state.prefinished && !state.finalCalled) {
    if (typeof stream._final === 'function') {
      state.pendingcb++;
      state.finalCalled = true;
      pna.nextTick(callFinal, stream, state);
    } else {
      state.prefinished = true;
      stream.emit('prefinish');
    }
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);
  if (need) {
    prefinish(stream, state);
    if (state.pendingcb === 0) {
      state.finished = true;
      stream.emit('finish');
    }
  }
  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);
  if (cb) {
    if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);
  }
  state.ended = true;
  stream.writable = false;
}

function onCorkedFinish(corkReq, state, err) {
  var entry = corkReq.entry;
  corkReq.entry = null;
  while (entry) {
    var cb = entry.callback;
    state.pendingcb--;
    cb(err);
    entry = entry.next;
  }
  if (state.corkedRequestsFree) {
    state.corkedRequestsFree.next = corkReq;
  } else {
    state.corkedRequestsFree = corkReq;
  }
}

Object.defineProperty(Writable.prototype, 'destroyed', {
  get: function () {
    if (this._writableState === undefined) {
      return false;
    }
    return this._writableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._writableState) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._writableState.destroyed = value;
  }
});

Writable.prototype.destroy = destroyImpl.destroy;
Writable.prototype._undestroy = destroyImpl.undestroy;
Writable.prototype._destroy = function (err, cb) {
  this.end();
  cb(err);
};
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./_stream_duplex":31,"./internal/streams/destroy":37,"./internal/streams/stream":38,"_process":25,"core-util-is":11,"inherits":20,"process-nextick-args":24,"safe-buffer":27,"util-deprecate":51}],36:[function(require,module,exports){
'use strict';

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Buffer = require('safe-buffer').Buffer;
var util = require('util');

function copyBuffer(src, target, offset) {
  src.copy(target, offset);
}

module.exports = function () {
  function BufferList() {
    _classCallCheck(this, BufferList);

    this.head = null;
    this.tail = null;
    this.length = 0;
  }

  BufferList.prototype.push = function push(v) {
    var entry = { data: v, next: null };
    if (this.length > 0) this.tail.next = entry;else this.head = entry;
    this.tail = entry;
    ++this.length;
  };

  BufferList.prototype.unshift = function unshift(v) {
    var entry = { data: v, next: this.head };
    if (this.length === 0) this.tail = entry;
    this.head = entry;
    ++this.length;
  };

  BufferList.prototype.shift = function shift() {
    if (this.length === 0) return;
    var ret = this.head.data;
    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
    --this.length;
    return ret;
  };

  BufferList.prototype.clear = function clear() {
    this.head = this.tail = null;
    this.length = 0;
  };

  BufferList.prototype.join = function join(s) {
    if (this.length === 0) return '';
    var p = this.head;
    var ret = '' + p.data;
    while (p = p.next) {
      ret += s + p.data;
    }return ret;
  };

  BufferList.prototype.concat = function concat(n) {
    if (this.length === 0) return Buffer.alloc(0);
    if (this.length === 1) return this.head.data;
    var ret = Buffer.allocUnsafe(n >>> 0);
    var p = this.head;
    var i = 0;
    while (p) {
      copyBuffer(p.data, ret, i);
      i += p.data.length;
      p = p.next;
    }
    return ret;
  };

  return BufferList;
}();

if (util && util.inspect && util.inspect.custom) {
  module.exports.prototype[util.inspect.custom] = function () {
    var obj = util.inspect({ length: this.length });
    return this.constructor.name + ' ' + obj;
  };
}
},{"safe-buffer":27,"util":5}],37:[function(require,module,exports){
'use strict';

/*<replacement>*/

var pna = require('process-nextick-args');
/*</replacement>*/

// undocumented cb() API, needed for core, not for public API
function destroy(err, cb) {
  var _this = this;

  var readableDestroyed = this._readableState && this._readableState.destroyed;
  var writableDestroyed = this._writableState && this._writableState.destroyed;

  if (readableDestroyed || writableDestroyed) {
    if (cb) {
      cb(err);
    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
      pna.nextTick(emitErrorNT, this, err);
    }
    return this;
  }

  // we set destroyed to true before firing error callbacks in order
  // to make it re-entrance safe in case destroy() is called within callbacks

  if (this._readableState) {
    this._readableState.destroyed = true;
  }

  // if this is a duplex stream mark the writable part as destroyed as well
  if (this._writableState) {
    this._writableState.destroyed = true;
  }

  this._destroy(err || null, function (err) {
    if (!cb && err) {
      pna.nextTick(emitErrorNT, _this, err);
      if (_this._writableState) {
        _this._writableState.errorEmitted = true;
      }
    } else if (cb) {
      cb(err);
    }
  });

  return this;
}

function undestroy() {
  if (this._readableState) {
    this._readableState.destroyed = false;
    this._readableState.reading = false;
    this._readableState.ended = false;
    this._readableState.endEmitted = false;
  }

  if (this._writableState) {
    this._writableState.destroyed = false;
    this._writableState.ended = false;
    this._writableState.ending = false;
    this._writableState.finished = false;
    this._writableState.errorEmitted = false;
  }
}

function emitErrorNT(self, err) {
  self.emit('error', err);
}

module.exports = {
  destroy: destroy,
  undestroy: undestroy
};
},{"process-nextick-args":24}],38:[function(require,module,exports){
module.exports = require('events').EventEmitter;

},{"events":18}],39:[function(require,module,exports){
module.exports = require('./readable').PassThrough

},{"./readable":40}],40:[function(require,module,exports){
exports = module.exports = require('./lib/_stream_readable.js');
exports.Stream = exports;
exports.Readable = exports;
exports.Writable = require('./lib/_stream_writable.js');
exports.Duplex = require('./lib/_stream_duplex.js');
exports.Transform = require('./lib/_stream_transform.js');
exports.PassThrough = require('./lib/_stream_passthrough.js');

},{"./lib/_stream_duplex.js":31,"./lib/_stream_passthrough.js":32,"./lib/_stream_readable.js":33,"./lib/_stream_transform.js":34,"./lib/_stream_writable.js":35}],41:[function(require,module,exports){
module.exports = require('./readable').Transform

},{"./readable":40}],42:[function(require,module,exports){
module.exports = require('./lib/_stream_writable.js');

},{"./lib/_stream_writable.js":35}],43:[function(require,module,exports){
'use strict';

var Buffer = require('safe-buffer').Buffer;

var isEncoding = Buffer.isEncoding || function (encoding) {
  encoding = '' + encoding;
  switch (encoding && encoding.toLowerCase()) {
    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
      return true;
    default:
      return false;
  }
};

function _normalizeEncoding(enc) {
  if (!enc) return 'utf8';
  var retried;
  while (true) {
    switch (enc) {
      case 'utf8':
      case 'utf-8':
        return 'utf8';
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return 'utf16le';
      case 'latin1':
      case 'binary':
        return 'latin1';
      case 'base64':
      case 'ascii':
      case 'hex':
        return enc;
      default:
        if (retried) return; // undefined
        enc = ('' + enc).toLowerCase();
        retried = true;
    }
  }
};

// Do not cache `Buffer.isEncoding` when checking encoding names as some
// modules monkey-patch it to support additional encodings
function normalizeEncoding(enc) {
  var nenc = _normalizeEncoding(enc);
  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
  return nenc || enc;
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters.
exports.StringDecoder = StringDecoder;
function StringDecoder(encoding) {
  this.encoding = normalizeEncoding(encoding);
  var nb;
  switch (this.encoding) {
    case 'utf16le':
      this.text = utf16Text;
      this.end = utf16End;
      nb = 4;
      break;
    case 'utf8':
      this.fillLast = utf8FillLast;
      nb = 4;
      break;
    case 'base64':
      this.text = base64Text;
      this.end = base64End;
      nb = 3;
      break;
    default:
      this.write = simpleWrite;
      this.end = simpleEnd;
      return;
  }
  this.lastNeed = 0;
  this.lastTotal = 0;
  this.lastChar = Buffer.allocUnsafe(nb);
}

StringDecoder.prototype.write = function (buf) {
  if (buf.length === 0) return '';
  var r;
  var i;
  if (this.lastNeed) {
    r = this.fillLast(buf);
    if (r === undefined) return '';
    i = this.lastNeed;
    this.lastNeed = 0;
  } else {
    i = 0;
  }
  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
  return r || '';
};

StringDecoder.prototype.end = utf8End;

// Returns only complete characters in a Buffer
StringDecoder.prototype.text = utf8Text;

// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
StringDecoder.prototype.fillLast = function (buf) {
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
  this.lastNeed -= buf.length;
};

// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
// continuation byte.
function utf8CheckByte(byte) {
  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
  return -1;
}

// Checks at most 3 bytes at the end of a Buffer in order to detect an
// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
// needed to complete the UTF-8 character (if applicable) are returned.
function utf8CheckIncomplete(self, buf, i) {
  var j = buf.length - 1;
  if (j < i) return 0;
  var nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 1;
    return nb;
  }
  if (--j < i) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 2;
    return nb;
  }
  if (--j < i) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) {
      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
    }
    return nb;
  }
  return 0;
}

// Validates as many continuation bytes for a multi-byte UTF-8 character as
// needed or are available. If we see a non-continuation byte where we expect
// one, we "replace" the validated continuation bytes we've seen so far with
// UTF-8 replacement characters ('\ufffd'), to match v8's UTF-8 decoding
// behavior. The continuation byte check is included three times in the case
// where all of the continuation bytes for a character exist in the same buffer.
// It is also done this way as a slight performance increase instead of using a
// loop.
function utf8CheckExtraBytes(self, buf, p) {
  if ((buf[0] & 0xC0) !== 0x80) {
    self.lastNeed = 0;
    return '\ufffd'.repeat(p);
  }
  if (self.lastNeed > 1 && buf.length > 1) {
    if ((buf[1] & 0xC0) !== 0x80) {
      self.lastNeed = 1;
      return '\ufffd'.repeat(p + 1);
    }
    if (self.lastNeed > 2 && buf.length > 2) {
      if ((buf[2] & 0xC0) !== 0x80) {
        self.lastNeed = 2;
        return '\ufffd'.repeat(p + 2);
      }
    }
  }
}

// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
function utf8FillLast(buf) {
  var p = this.lastTotal - this.lastNeed;
  var r = utf8CheckExtraBytes(this, buf, p);
  if (r !== undefined) return r;
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, p, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, p, 0, buf.length);
  this.lastNeed -= buf.length;
}

// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
// partial character, the character's bytes are buffered until the required
// number of bytes are available.
function utf8Text(buf, i) {
  var total = utf8CheckIncomplete(this, buf, i);
  if (!this.lastNeed) return buf.toString('utf8', i);
  this.lastTotal = total;
  var end = buf.length - (total - this.lastNeed);
  buf.copy(this.lastChar, 0, end);
  return buf.toString('utf8', i, end);
}

// For UTF-8, a replacement character for each buffered byte of a (partial)
// character needs to be added to the output.
function utf8End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + '\ufffd'.repeat(this.lastTotal - this.lastNeed);
  return r;
}

// UTF-16LE typically needs two bytes per character, but even if we have an even
// number of bytes available, we need to check if we end on a leading/high
// surrogate. In that case, we need to wait for the next two bytes in order to
// decode the last character properly.
function utf16Text(buf, i) {
  if ((buf.length - i) % 2 === 0) {
    var r = buf.toString('utf16le', i);
    if (r) {
      var c = r.charCodeAt(r.length - 1);
      if (c >= 0xD800 && c <= 0xDBFF) {
        this.lastNeed = 2;
        this.lastTotal = 4;
        this.lastChar[0] = buf[buf.length - 2];
        this.lastChar[1] = buf[buf.length - 1];
        return r.slice(0, -1);
      }
    }
    return r;
  }
  this.lastNeed = 1;
  this.lastTotal = 2;
  this.lastChar[0] = buf[buf.length - 1];
  return buf.toString('utf16le', i, buf.length - 1);
}

// For UTF-16LE we do not explicitly append special replacement characters if we
// end on a partial character, we simply let v8 handle that.
function utf16End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) {
    var end = this.lastTotal - this.lastNeed;
    return r + this.lastChar.toString('utf16le', 0, end);
  }
  return r;
}

function base64Text(buf, i) {
  var n = (buf.length - i) % 3;
  if (n === 0) return buf.toString('base64', i);
  this.lastNeed = 3 - n;
  this.lastTotal = 3;
  if (n === 1) {
    this.lastChar[0] = buf[buf.length - 1];
  } else {
    this.lastChar[0] = buf[buf.length - 2];
    this.lastChar[1] = buf[buf.length - 1];
  }
  return buf.toString('base64', i, buf.length - n);
}

function base64End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
  return r;
}

// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
function simpleWrite(buf) {
  return buf.toString(this.encoding);
}

function simpleEnd(buf) {
  return buf && buf.length ? this.write(buf) : '';
}
},{"safe-buffer":27}],44:[function(require,module,exports){
(function (process){
var defined = require('defined');
var createDefaultStream = require('./lib/default_stream');
var Test = require('./lib/test');
var createResult = require('./lib/results');
var through = require('through');

var canEmitExit = typeof process !== 'undefined' && process
    && typeof process.on === 'function' && process.browser !== true
;
var canExit = typeof process !== 'undefined' && process
    && typeof process.exit === 'function'
;

var nextTick = typeof setImmediate !== 'undefined'
    ? setImmediate
    : process.nextTick
;

exports = module.exports = (function () {
    var harness;
    var lazyLoad = function () {
        return getHarness().apply(this, arguments);
    };
    
    lazyLoad.only = function () {
        return getHarness().only.apply(this, arguments);
    };
    
    lazyLoad.createStream = function (opts) {
        if (!opts) opts = {};
        if (!harness) {
            var output = through();
            getHarness({ stream: output, objectMode: opts.objectMode });
            return output;
        }
        return harness.createStream(opts);
    };
    
    return lazyLoad
    
    function getHarness (opts) {
        if (!opts) opts = {};
        opts.autoclose = !canEmitExit;
        if (!harness) harness = createExitHarness(opts);
        return harness;
    }
})();

function createExitHarness (conf) {
    if (!conf) conf = {};
    var harness = createHarness({
        autoclose: defined(conf.autoclose, false)
    });
    
    var stream = harness.createStream({ objectMode: conf.objectMode });
    var es = stream.pipe(conf.stream || createDefaultStream());
    if (canEmitExit) {
        es.on('error', function (err) { harness._exitCode = 1 });
    }
    
    var ended = false;
    stream.on('end', function () { ended = true });
    
    if (conf.exit === false) return harness;
    if (!canEmitExit || !canExit) return harness;

    var inErrorState = false;

    process.on('exit', function (code) {
        // let the process exit cleanly.
        if (code !== 0) {
            return
        }

        if (!ended) {
            var only = harness._results._only;
            for (var i = 0; i < harness._tests.length; i++) {
                var t = harness._tests[i];
                if (only && t.name !== only) continue;
                t._exit();
            }
        }
        harness.close();
        process.exit(code || harness._exitCode);
    });
    
    return harness;
}

exports.createHarness = createHarness;
exports.Test = Test;
exports.test = exports; // tap compat
exports.test.skip = Test.skip;

var exitInterval;

function createHarness (conf_) {
    if (!conf_) conf_ = {};
    var results = createResult();
    if (conf_.autoclose !== false) {
        results.once('done', function () { results.close() });
    }
    
    var test = function (name, conf, cb) {
        var t = new Test(name, conf, cb);
        test._tests.push(t);
        
        (function inspectCode (st) {
            st.on('test', function sub (st_) {
                inspectCode(st_);
            });
            st.on('result', function (r) {
                if (!r.ok) test._exitCode = 1
            });
        })(t);
        
        results.push(t);
        return t;
    };
    test._results = results;
    
    test._tests = [];
    
    test.createStream = function (opts) {
        return results.createStream(opts);
    };
    
    var only = false;
    test.only = function (name) {
        if (only) throw new Error('there can only be one only test');
        results.only(name);
        only = true;
        return test.apply(null, arguments);
    };
    test._exitCode = 0;
    
    test.close = function () { results.close() };
    
    return test;
}

}).call(this,require('_process'))
},{"./lib/default_stream":45,"./lib/results":46,"./lib/test":47,"_process":25,"defined":48,"through":49}],45:[function(require,module,exports){
(function (process){
var through = require('through');
var fs = require('fs');

module.exports = function () {
    var line = '';
    var stream = through(write, flush);
    return stream;
    
    function write (buf) {
        for (var i = 0; i < buf.length; i++) {
            var c = typeof buf === 'string'
                ? buf.charAt(i)
                : String.fromCharCode(buf[i])
            ;
            if (c === '\n') flush();
            else line += c;
        }
    }
    
    function flush () {
        if (fs.writeSync && /^win/.test(process.platform)) {
            try { fs.writeSync(1, line + '\n'); }
            catch (e) { stream.emit('error', e) }
        }
        else {
            try { console.log(line) }
            catch (e) { stream.emit('error', e) }
        }
        line = '';
    }
};

}).call(this,require('_process'))
},{"_process":25,"fs":6,"through":49}],46:[function(require,module,exports){
(function (process){
var EventEmitter = require('events').EventEmitter;
var inherits = require('inherits');
var through = require('through');
var resumer = require('resumer');
var inspect = require('object-inspect');
var hasOwn = Object.prototype.hasOwnProperty;
var nextTick = typeof setImmediate !== 'undefined'
    ? setImmediate
    : process.nextTick
;

module.exports = Results;
inherits(Results, EventEmitter);

function Results () {
    if (!(this instanceof Results)) return new Results;
    this.count = 0;
    this.fail = 0;
    this.pass = 0;
    this._stream = through();
    this.tests = [];
}

Results.prototype.createStream = function (opts) {
    if (!opts) opts = {};
    var self = this;
    var output, testId = 0;
    if (opts.objectMode) {
        output = through();
        self.on('_push', function ontest (t, extra) {
            if (!extra) extra = {};
            var id = testId++;
            t.once('prerun', function () {
                var row = {
                    type: 'test',
                    name: t.name,
                    id: id
                };
                if (has(extra, 'parent')) {
                    row.parent = extra.parent;
                }
                output.queue(row);
            });
            t.on('test', function (st) {
                ontest(st, { parent: id });
            });
            t.on('result', function (res) {
                res.test = id;
                res.type = 'assert';
                output.queue(res);
            });
            t.on('end', function () {
                output.queue({ type: 'end', test: id });
            });
        });
        self.on('done', function () { output.queue(null) });
    }
    else {
        output = resumer();
        output.queue('TAP version 13\n');
        self._stream.pipe(output);
    }
    
    nextTick(function next() {
        var t;
        while (t = getNextTest(self)) {
            t.run();
            if (!t.ended) return t.once('end', function(){ nextTick(next); });
        }
        self.emit('done');
    });
    
    return output;
};

Results.prototype.push = function (t) {
    var self = this;
    self.tests.push(t);
    self._watch(t);
    self.emit('_push', t);
};

Results.prototype.only = function (name) {
    if (this._only) {
        self.count ++;
        self.fail ++;
        write('not ok ' + self.count + ' already called .only()\n');
    }
    this._only = name;
};

Results.prototype._watch = function (t) {
    var self = this;
    var write = function (s) { self._stream.queue(s) };
    t.once('prerun', function () {
        write('# ' + t.name + '\n');
    });
    
    t.on('result', function (res) {
        if (typeof res === 'string') {
            write('# ' + res + '\n');
            return;
        }
        write(encodeResult(res, self.count + 1));
        self.count ++;

        if (res.ok) self.pass ++
        else self.fail ++
    });
    
    t.on('test', function (st) { self._watch(st) });
};

Results.prototype.close = function () {
    var self = this;
    if (self.closed) self._stream.emit('error', new Error('ALREADY CLOSED'));
    self.closed = true;
    var write = function (s) { self._stream.queue(s) };
    
    write('\n1..' + self.count + '\n');
    write('# tests ' + self.count + '\n');
    write('# pass  ' + self.pass + '\n');
    if (self.fail) write('# fail  ' + self.fail + '\n')
    else write('\n# ok\n')

    self._stream.queue(null);
};

function encodeResult (res, count) {
    var output = '';
    output += (res.ok ? 'ok ' : 'not ok ') + count;
    output += res.name ? ' ' + res.name.toString().replace(/\s+/g, ' ') : '';
    
    if (res.skip) output += ' # SKIP';
    else if (res.todo) output += ' # TODO';
    
    output += '\n';
    if (res.ok) return output;
    
    var outer = '  ';
    var inner = outer + '  ';
    output += outer + '---\n';
    output += inner + 'operator: ' + res.operator + '\n';
    
    if (has(res, 'expected') || has(res, 'actual')) {
        var ex = inspect(res.expected);
        var ac = inspect(res.actual);
        
        if (Math.max(ex.length, ac.length) > 65) {
            output += inner + 'expected:\n' + inner + '  ' + ex + '\n';
            output += inner + 'actual:\n' + inner + '  ' + ac + '\n';
        }
        else {
            output += inner + 'expected: ' + ex + '\n';
            output += inner + 'actual:   ' + ac + '\n';
        }
    }
    if (res.at) {
        output += inner + 'at: ' + res.at + '\n';
    }
    if (res.operator === 'error' && res.actual && res.actual.stack) {
        var lines = String(res.actual.stack).split('\n');
        output += inner + 'stack:\n';
        output += inner + '  ' + lines[0] + '\n';
        for (var i = 1; i < lines.length; i++) {
            output += inner + lines[i] + '\n';
        }
    }
    
    output += outer + '...\n';
    return output;
}

function getNextTest (results) {
    if (!results._only) {
        return results.tests.shift();
    }
    
    do {
        var t = results.tests.shift();
        if (!t) continue;
        if (results._only === t.name) {
            return t;
        }
    } while (results.tests.length !== 0)
}

function has (obj, prop) {
    return hasOwn.call(obj, prop);
}

}).call(this,require('_process'))
},{"_process":25,"events":18,"inherits":20,"object-inspect":22,"resumer":26,"through":49}],47:[function(require,module,exports){
(function (process,__dirname){
var deepEqual = require('deep-equal');
var defined = require('defined');
var path = require('path');
var inherits = require('inherits');
var EventEmitter = require('events').EventEmitter;

module.exports = Test;

var nextTick = typeof setImmediate !== 'undefined'
    ? setImmediate
    : process.nextTick
;

inherits(Test, EventEmitter);

var getTestArgs = function (name_, opts_, cb_) {
    var name = '(anonymous)';
    var opts = {};
    var cb;

    for (var i = 0; i < arguments.length; i++) {
        var arg = arguments[i];
        var t = typeof arg;
        if (t === 'string') {
            name = arg;
        }
        else if (t === 'object') {
            opts = arg || opts;
        }
        else if (t === 'function') {
            cb = arg;
        }
    }
    return { name: name, opts: opts, cb: cb };
};

function Test (name_, opts_, cb_) {
    if (! (this instanceof Test)) {
        return new Test(name_, opts_, cb_);
    }

    var args = getTestArgs(name_, opts_, cb_);

    this.readable = true;
    this.name = args.name || '(anonymous)';
    this.assertCount = 0;
    this.pendingCount = 0;
    this._skip = args.opts.skip || false;
    this._plan = undefined;
    this._cb = args.cb;
    this._progeny = [];
    this._ok = true;

    if (args.opts.timeout !== undefined) {
        this.timeoutAfter(args.opts.timeout);
    }

    for (var prop in this) {
        this[prop] = (function bind(self, val) {
            if (typeof val === 'function') {
                return function bound() {
                    return val.apply(self, arguments);
                };
            }
            else return val;
        })(this, this[prop]);
    }
}

Test.prototype.run = function () {
    if (!this._cb || this._skip) {
        return this._end();
    }
    this.emit('prerun');
    this._cb(this);
    this.emit('run');
};

Test.prototype.test = function (name, opts, cb) {
    var self = this;
    var t = new Test(name, opts, cb);
    this._progeny.push(t);
    this.pendingCount++;
    this.emit('test', t);
    t.on('prerun', function () {
        self.assertCount++;
    })
    
    if (!self._pendingAsserts()) {
        nextTick(function () {
            self._end();
        });
    }
    
    nextTick(function() {
        if (!self._plan && self.pendingCount == self._progeny.length) {
            self._end();
        }
    });
};

Test.prototype.comment = function (msg) {
    this.emit('result', msg.trim().replace(/^#\s*/, ''));
};

Test.prototype.plan = function (n) {
    this._plan = n;
    this.emit('plan', n);
};

Test.prototype.timeoutAfter = function(ms) {
    if (!ms) throw new Error('timeoutAfter requires a timespan');
    var self = this;
    var timeout = setTimeout(function() {
        self.fail('test timed out after ' + ms + 'ms');
        self.end();
    }, ms);
    this.once('end', function() {
        clearTimeout(timeout);
    });
}

Test.prototype.end = function (err) { 
    var self = this;
    if (arguments.length >= 1 && !!err) {
        this.ifError(err);
    }
    
    if (this.calledEnd) {
        this.fail('.end() called twice');
    }
    this.calledEnd = true;
    this._end();
};

Test.prototype._end = function (err) {
    var self = this;
    if (this._progeny.length) {
        var t = this._progeny.shift();
        t.on('end', function () { self._end() });
        t.run();
        return;
    }
    
    if (!this.ended) this.emit('end');
    var pendingAsserts = this._pendingAsserts();
    if (!this._planError && this._plan !== undefined && pendingAsserts) {
        this._planError = true;
        this.fail('plan != count', {
            expected : this._plan,
            actual : this.assertCount
        });
    }
    this.ended = true;
};

Test.prototype._exit = function () {
    if (this._plan !== undefined &&
        !this._planError && this.assertCount !== this._plan) {
        this._planError = true;
        this.fail('plan != count', {
            expected : this._plan,
            actual : this.assertCount,
            exiting : true
        });
    }
    else if (!this.ended) {
        this.fail('test exited without ending', {
            exiting: true
        });
    }
};

Test.prototype._pendingAsserts = function () {
    if (this._plan === undefined) {
        return 1;
    }
    else {
        return this._plan - (this._progeny.length + this.assertCount);
    }
};

Test.prototype._assert = function assert (ok, opts) {
    var self = this;
    var extra = opts.extra || {};
    
    var res = {
        id : self.assertCount ++,
        ok : Boolean(ok),
        skip : defined(extra.skip, opts.skip),
        name : defined(extra.message, opts.message, '(unnamed assert)'),
        operator : defined(extra.operator, opts.operator)
    };
    if (has(opts, 'actual') || has(extra, 'actual')) {
        res.actual = defined(extra.actual, opts.actual);
    }
    if (has(opts, 'expected') || has(extra, 'expected')) {
        res.expected = defined(extra.expected, opts.expected);
    }
    this._ok = Boolean(this._ok && ok);
    
    if (!ok) {
        res.error = defined(extra.error, opts.error, new Error(res.name));
    }
    
    if (!ok) {
        var e = new Error('exception');
        var err = (e.stack || '').split('\n');
        var dir = path.dirname(__dirname) + '/';
        
        for (var i = 0; i < err.length; i++) {
            var m = /^[^\s]*\s*\bat\s+(.+)/.exec(err[i]);
            if (!m) {
                continue;
            }
            
            var s = m[1].split(/\s+/);
            var filem = /(\/[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[1]);
            if (!filem) {
                filem = /(\/[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[2]);
                
                if (!filem) {
                    filem = /(\/[^:\s]+:(\d+)(?::(\d+))?)/.exec(s[3]);

                    if (!filem) {
                        continue;
                    }
                }
            }
            
            if (filem[1].slice(0, dir.length) === dir) {
                continue;
            }
            
            res.functionName = s[0];
            res.file = filem[1];
            res.line = Number(filem[2]);
            if (filem[3]) res.column = filem[3];
            
            res.at = m[1];
            break;
        }
    }

    self.emit('result', res);
    
    var pendingAsserts = self._pendingAsserts();
    if (!pendingAsserts) {
        if (extra.exiting) {
            self._end();
        } else {
            nextTick(function () {
                self._end();
            });
        }
    }
    
    if (!self._planError && pendingAsserts < 0) {
        self._planError = true;
        self.fail('plan != count', {
            expected : self._plan,
            actual : self._plan - pendingAsserts
        });
    }
};

Test.prototype.fail = function (msg, extra) {
    this._assert(false, {
        message : msg,
        operator : 'fail',
        extra : extra
    });
};

Test.prototype.pass = function (msg, extra) {
    this._assert(true, {
        message : msg,
        operator : 'pass',
        extra : extra
    });
};

Test.prototype.skip = function (msg, extra) {
    this._assert(true, {
        message : msg,
        operator : 'skip',
        skip : true,
        extra : extra
    });
};

Test.prototype.ok
= Test.prototype['true']
= Test.prototype.assert
= function (value, msg, extra) {
    this._assert(value, {
        message : msg,
        operator : 'ok',
        expected : true,
        actual : value,
        extra : extra
    });
};

Test.prototype.notOk
= Test.prototype['false']
= Test.prototype.notok
= function (value, msg, extra) {
    this._assert(!value, {
        message : msg,
        operator : 'notOk',
        expected : false,
        actual : value,
        extra : extra
    });
};

Test.prototype.error
= Test.prototype.ifError
= Test.prototype.ifErr
= Test.prototype.iferror
= function (err, msg, extra) {
    this._assert(!err, {
        message : defined(msg, String(err)),
        operator : 'error',
        actual : err,
        extra : extra
    });
};

Test.prototype.equal
= Test.prototype.equals
= Test.prototype.isEqual
= Test.prototype.is
= Test.prototype.strictEqual
= Test.prototype.strictEquals
= function (a, b, msg, extra) {
    this._assert(a === b, {
        message : defined(msg, 'should be equal'),
        operator : 'equal',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.notEqual
= Test.prototype.notEquals
= Test.prototype.notStrictEqual
= Test.prototype.notStrictEquals
= Test.prototype.isNotEqual
= Test.prototype.isNot
= Test.prototype.not
= Test.prototype.doesNotEqual
= Test.prototype.isInequal
= function (a, b, msg, extra) {
    this._assert(a !== b, {
        message : defined(msg, 'should not be equal'),
        operator : 'notEqual',
        actual : a,
        notExpected : b,
        extra : extra
    });
};

Test.prototype.deepEqual
= Test.prototype.deepEquals
= Test.prototype.isEquivalent
= Test.prototype.same
= function (a, b, msg, extra) {
    this._assert(deepEqual(a, b, { strict: true }), {
        message : defined(msg, 'should be equivalent'),
        operator : 'deepEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.deepLooseEqual
= Test.prototype.looseEqual
= Test.prototype.looseEquals
= function (a, b, msg, extra) {
    this._assert(deepEqual(a, b), {
        message : defined(msg, 'should be equivalent'),
        operator : 'deepLooseEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype.notDeepEqual
= Test.prototype.notEquivalent
= Test.prototype.notDeeply
= Test.prototype.notSame
= Test.prototype.isNotDeepEqual
= Test.prototype.isNotDeeply
= Test.prototype.isNotEquivalent
= Test.prototype.isInequivalent
= function (a, b, msg, extra) {
    this._assert(!deepEqual(a, b, { strict: true }), {
        message : defined(msg, 'should not be equivalent'),
        operator : 'notDeepEqual',
        actual : a,
        notExpected : b,
        extra : extra
    });
};

Test.prototype.notDeepLooseEqual
= Test.prototype.notLooseEqual
= Test.prototype.notLooseEquals
= function (a, b, msg, extra) {
    this._assert(!deepEqual(a, b), {
        message : defined(msg, 'should be equivalent'),
        operator : 'notDeepLooseEqual',
        actual : a,
        expected : b,
        extra : extra
    });
};

Test.prototype['throws'] = function (fn, expected, msg, extra) {
    if (typeof expected === 'string') {
        msg = expected;
        expected = undefined;
    }

    var caught = undefined;

    try {
        fn();
    } catch (err) {
        caught = { error : err };
        var message = err.message;
        delete err.message;
        err.message = message;
    }

    var passed = caught;

    if (expected instanceof RegExp) {
        passed = expected.test(caught && caught.error);
        expected = String(expected);
    }

    if (typeof expected === 'function' && caught) {
        passed = caught.error instanceof expected;
        caught.error = caught.error.constructor;
    }

    this._assert(passed, {
        message : defined(msg, 'should throw'),
        operator : 'throws',
        actual : caught && caught.error,
        expected : expected,
        error: !passed && caught && caught.error,
        extra : extra
    });
};

Test.prototype.doesNotThrow = function (fn, expected, msg, extra) {
    if (typeof expected === 'string') {
        msg = expected;
        expected = undefined;
    }
    var caught = undefined;
    try {
        fn();
    }
    catch (err) {
        caught = { error : err };
    }
    this._assert(!caught, {
        message : defined(msg, 'should not throw'),
        operator : 'throws',
        actual : caught && caught.error,
        expected : expected,
        error : caught && caught.error,
        extra : extra
    });
};

function has (obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
}

Test.skip = function (name_, _opts, _cb) {
    var args = getTestArgs.apply(null, arguments);
    args.opts.skip = true;
    return Test(args.name, args.opts, args.cb);
};

// vim: set softtabstop=4 shiftwidth=4:


}).call(this,require('_process'),"/node_modules/tape/lib")
},{"_process":25,"deep-equal":15,"defined":48,"events":18,"inherits":20,"path":23}],48:[function(require,module,exports){
module.exports = function () {
    for (var i = 0; i < arguments.length; i++) {
        if (arguments[i] !== undefined) return arguments[i];
    }
};

},{}],49:[function(require,module,exports){
(function (process){
var Stream = require('stream')

// through
//
// a stream that does nothing but re-emit the input.
// useful for aggregating a series of changing but not ending streams into one stream)

exports = module.exports = through
through.through = through

//create a readable writable stream.

function through (write, end, opts) {
  write = write || function (data) { this.queue(data) }
  end = end || function () { this.queue(null) }

  var ended = false, destroyed = false, buffer = [], _ended = false
  var stream = new Stream()
  stream.readable = stream.writable = true
  stream.paused = false

//  stream.autoPause   = !(opts && opts.autoPause   === false)
  stream.autoDestroy = !(opts && opts.autoDestroy === false)

  stream.write = function (data) {
    write.call(this, data)
    return !stream.paused
  }

  function drain() {
    while(buffer.length && !stream.paused) {
      var data = buffer.shift()
      if(null === data)
        return stream.emit('end')
      else
        stream.emit('data', data)
    }
  }

  stream.queue = stream.push = function (data) {
//    console.error(ended)
    if(_ended) return stream
    if(data === null) _ended = true
    buffer.push(data)
    drain()
    return stream
  }

  //this will be registered as the first 'end' listener
  //must call destroy next tick, to make sure we're after any
  //stream piped from here.
  //this is only a problem if end is not emitted synchronously.
  //a nicer way to do this is to make sure this is the last listener for 'end'

  stream.on('end', function () {
    stream.readable = false
    if(!stream.writable && stream.autoDestroy)
      process.nextTick(function () {
        stream.destroy()
      })
  })

  function _end () {
    stream.writable = false
    end.call(stream)
    if(!stream.readable && stream.autoDestroy)
      stream.destroy()
  }

  stream.end = function (data) {
    if(ended) return
    ended = true
    if(arguments.length) stream.write(data)
    _end() // will emit or queue
    return stream
  }

  stream.destroy = function () {
    if(destroyed) return
    destroyed = true
    ended = true
    buffer.length = 0
    stream.writable = stream.readable = false
    stream.emit('close')
    return stream
  }

  stream.pause = function () {
    if(stream.paused) return
    stream.paused = true
    return stream
  }

  stream.resume = function () {
    if(stream.paused) {
      stream.paused = false
      stream.emit('resume')
    }
    drain()
    //may have become paused again,
    //as drain emits 'data'.
    if(!stream.paused)
      stream.emit('drain')
    return stream
  }
  return stream
}


}).call(this,require('_process'))
},{"_process":25,"stream":28}],50:[function(require,module,exports){
var si = typeof setImmediate === 'function', tick;
if (si) {
  tick = function (fn) { setImmediate(fn); };
} else {
  tick = function (fn) { setTimeout(fn, 0); };
}

module.exports = tick;
},{}],51:[function(require,module,exports){
(function (global){

/**
 * Module exports.
 */

module.exports = deprecate;

/**
 * Mark that a method should not be used.
 * Returns a modified function which warns once by default.
 *
 * If `localStorage.noDeprecation = true` is set, then it is a no-op.
 *
 * If `localStorage.throwDeprecation = true` is set, then deprecated functions
 * will throw an Error when invoked.
 *
 * If `localStorage.traceDeprecation = true` is set, then deprecated functions
 * will invoke `console.trace()` instead of `console.error()`.
 *
 * @param {Function} fn - the function to deprecate
 * @param {String} msg - the string to print to the console when `fn` is invoked
 * @returns {Function} a new "deprecated" version of `fn`
 * @api public
 */

function deprecate (fn, msg) {
  if (config('noDeprecation')) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (config('throwDeprecation')) {
        throw new Error(msg);
      } else if (config('traceDeprecation')) {
        console.trace(msg);
      } else {
        console.warn(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

/**
 * Checks `localStorage` for boolean values for the given `name`.
 *
 * @param {String} name
 * @returns {Boolean}
 * @api private
 */

function config (name) {
  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
  try {
    if (!global.localStorage) return false;
  } catch (_) {
    return false;
  }
  var val = global.localStorage[name];
  if (null == val) return false;
  return String(val).toLowerCase() === 'true';
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],52:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('cancel does not throw when not dragging', function (t) {
  t.test('a single time', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.cancel();
    }, 'dragula ignores a single call to drake.cancel');
    st.end();
  });
  t.test('multiple times', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.cancel();
      drake.cancel();
      drake.cancel();
      drake.cancel();
    }, 'dragula ignores multiple calls to drake.cancel');
    st.end();
  });
  t.end();
});

test('when dragging and cancel gets called, nothing happens', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.cancel();
  t.equal(div.children.length, 1, 'nothing happens');
  t.equal(drake.dragging, false, 'drake has stopped dragging');
  t.end();
});

test('when dragging and cancel gets called, cancel event is emitted', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.on('cancel', cancel);
  drake.on('dragend', dragend);
  drake.cancel();
  t.plan(3);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function cancel (target, container) {
    t.equal(target, item, 'cancel was invoked with item');
    t.equal(container, div, 'cancel was invoked with container');
  }
});

test('when dragging a copy and cancel gets called, default does not revert', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item);
  div2.appendChild(item);
  drake.on('drop', drop);
  drake.on('dragend', dragend);
  drake.cancel();
  t.plan(4);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function drop (target, parent, source) {
    t.equal(target, item, 'drop was invoked with item');
    t.equal(parent, div2, 'drop was invoked with final container');
    t.equal(source, div, 'drop was invoked with source container');
  }
});

test('when dragging a copy and cancel gets called, revert is executed', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item);
  div2.appendChild(item);
  drake.on('cancel', cancel);
  drake.on('dragend', dragend);
  drake.cancel(true);
  t.plan(3);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function cancel (target, container) {
    t.equal(target, item, 'cancel was invoked with item');
    t.equal(container, div, 'cancel was invoked with container');
  }
});

},{"..":2,"tape":44}],53:[function(require,module,exports){
'use strict';

var test = require('tape');
var classes = require('../classes');

test('classes exports the expected api', function (t) {
  t.equal(typeof classes.add, 'function', 'classes.add is a method');
  t.equal(typeof classes.rm, 'function', 'classes.rm is a method');
  t.end();
});

test('classes can add a class', function (t) {
  var el = document.createElement('div');
  classes.add(el, 'gu-foo');
  t.equal(el.className, 'gu-foo', 'setting a class works');
  t.end();
});

test('classes can add a class to an element that already has classes', function (t) {
  var el = document.createElement('div');
  el.className = 'bar';
  classes.add(el, 'gu-foo');
  t.equal(el.className, 'bar gu-foo', 'appending a class works');
  t.end();
});

test('classes.add is a no-op if class already is in element', function (t) {
  var el = document.createElement('div');
  el.className = 'gu-foo';
  classes.add(el, 'gu-foo');
  t.equal(el.className, 'gu-foo', 'no-op as expected');
  t.end();
});

test('classes can remove a class', function (t) {
  var el = document.createElement('div');
  el.className = 'gu-foo';
  classes.rm(el, 'gu-foo');
  t.equal(el.className, '', 'removing a class works');
  t.end();
});

test('classes can remove a class from a list on the right', function (t) {
  var el = document.createElement('div');
  el.className = 'bar gu-foo';
  classes.rm(el, 'gu-foo');
  t.equal(el.className, 'bar', 'removing a class from the list works to the right');
  t.end();
});

test('classes can remove a class from a list on the left', function (t) {
  var el = document.createElement('div');
  el.className = 'gu-foo bar';
  classes.rm(el, 'gu-foo');
  t.equal(el.className, 'bar', 'removing a class from the list works to the left');
  t.end();
});

test('classes can remove a class from a list on the middle', function (t) {
  var el = document.createElement('div');
  el.className = 'foo gu-foo bar';
  classes.rm(el, 'gu-foo');
  t.equal(el.className, 'foo bar', 'removing a class from the list works to the middle');
  t.end();
});

},{"../classes":1,"tape":44}],54:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('drake defaults to no containers', function (t) {
  var drake = dragula();
  t.ok(Array.isArray(drake.containers), 'drake.containers is an array');
  t.equal(drake.containers.length, 0, 'drake.containers is empty');
  t.end();
});

test('drake reads containers from array argument', function (t) {
  var el = document.createElement('div');
  var containers = [el];
  var drake = dragula(containers);
  t.equal(drake.containers, containers, 'drake.containers matches input');
  t.equal(drake.containers.length, 1, 'drake.containers has one item');
  t.end();
});

test('drake reads containers from array in options', function (t) {
  var el = document.createElement('div');
  var containers = [el];
  var drake = dragula({ containers: containers });
  t.equal(drake.containers, containers, 'drake.containers matches input');
  t.equal(drake.containers.length, 1, 'drake.containers has one item');
  t.end();
});

test('containers in options take precedent', function (t) {
  var el = document.createElement('div');
  var containers = [el];
  var drake = dragula([], { containers: containers });
  t.equal(drake.containers, containers, 'drake.containers matches input');
  t.equal(drake.containers.length, 1, 'drake.containers has one item');
  t.end();
});

},{"..":2,"tape":44}],55:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('drake has sensible default options', function (t) {
  var options = {};
  dragula(options);
  t.equal(typeof options.moves, 'function', 'options.moves defaults to a method');
  t.equal(typeof options.accepts, 'function', 'options.accepts defaults to a method');
  t.equal(typeof options.invalid, 'function', 'options.invalid defaults to a method');
  t.equal(typeof options.isContainer, 'function', 'options.isContainer defaults to a method');
  t.equal(options.copy, false, 'options.copy defaults to false');
  t.equal(options.revertOnSpill, false, 'options.revertOnSpill defaults to false');
  t.equal(options.removeOnSpill, false, 'options.removeOnSpill defaults to false');
  t.equal(options.direction, 'vertical', 'options.direction defaults to \'vertical\'');
  t.equal(options.deadzone, 0, 'options.deadzone defaults to 0');
  t.equal(options.mirrorContainer, document.body, 'options.mirrorContainer defaults to an document.body');
  t.end();
});

},{"..":2,"tape":44}],56:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('destroy does not throw when not dragging, destroyed, or whatever', function (t) {
  t.test('a single time', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.destroy();
    }, 'dragula bites into a single call to drake.destroy');
    st.end();
  });
  t.test('multiple times', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.destroy();
      drake.destroy();
      drake.destroy();
      drake.destroy();
    }, 'dragula bites into multiple calls to drake.destroy');
    st.end();
  });
  t.end();
});

test('when dragging and destroy gets called, nothing happens', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.destroy();
  t.equal(div.children.length, 1, 'nothing happens');
  t.equal(drake.dragging, false, 'drake has stopped dragging');
  t.end();
});

test('when dragging and destroy gets called, dragend event is emitted gracefully', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.on('dragend', dragend);
  drake.destroy();
  t.plan(1);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
});

test('when dragging a copy and destroy gets called, default does not revert', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item);
  div2.appendChild(item);
  drake.on('drop', drop);
  drake.on('dragend', dragend);
  drake.destroy();
  t.plan(4);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function drop (target, parent, source) {
    t.equal(target, item, 'drop was invoked with item');
    t.equal(parent, div2, 'drop was invoked with final container');
    t.equal(source, div, 'drop was invoked with source container');
  }
});

test('when dragging a copy and destroy gets called, revert is executed', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div, div2], { revertOnSpill: true });
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item);
  div2.appendChild(item);
  drake.on('cancel', cancel);
  drake.on('dragend', dragend);
  drake.destroy();
  t.plan(3);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function cancel (target, container) {
    t.equal(target, item, 'cancel was invoked with item');
    t.equal(container, div, 'cancel was invoked with container');
  }
});

},{"..":2,"tape":44}],57:[function(require,module,exports){
'use strict';

var test = require('tape');
var events = require('./lib/events');
var dragula = require('..');

test('drag event gets emitted when clicking an item', function (t) {
  testCase('works for left clicks', { which: 1 });
  testCase('works for wheel clicks', { which: 1 });
  testCase('works when clicking buttons by default', { which: 1 }, { tag: 'button', passes: true });
  testCase('works when clicking anchors by default', { which: 1 }, { tag: 'a', passes: true });
  testCase('fails for right clicks', { which: 2 }, { passes: false });
  testCase('fails for meta-clicks', { which: 1, metaKey: true }, { passes: false });
  testCase('fails for ctrl-clicks', { which: 1, ctrlKey: true }, { passes: false });
  testCase('fails when clicking containers', { which: 1 }, { containerClick: true, passes: false });
  testCase('fails whenever invalid returns true', { which: 1 }, { passes: false, dragulaOpts: { invalid: always } });
  testCase('fails whenever moves returns false', { which: 1 }, { passes: false, dragulaOpts: { moves: never } });
  t.end();
  function testCase (desc, eventOptions, options) {
    t.test(desc, function subtest (st) {
      var o = options || {};
      var div = document.createElement('div');
      var item = document.createElement(o.tag || 'div');
      var passes = o.passes !== false;
      var drake = dragula([div], o.dragulaOpts);
      div.appendChild(item);
      document.body.appendChild(div);
      drake.on('drag', drag);
      events.raise(o.containerClick ? div : item, 'mousedown', eventOptions);
      events.raise(o.containerClick ? div : item, 'mousemove');
      st.plan(passes ? 4 : 1);
      st.equal(drake.dragging, passes, desc + ': final state is drake is ' + (passes ? '' : 'not ') + 'dragging');
      drake.destroy();
      st.end();
      function drag (target, container) {
        st[passes ? 'pass' : 'fail'](desc + ': drag event was emitted synchronously');
        st.equal(target, item, desc + ': first argument is selected item');
        st.equal(container, div, desc + ': second argument is container');
      }
    });
  }
});

test('when already dragging, mousedown/mousemove ends (cancels) previous drag', function (t) {
  var div = document.createElement('div');
  var item1 = document.createElement('div');
  var item2 = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item1);
  div.appendChild(item2);
  document.body.appendChild(div);
  drake.start(item1);
  drake.on('dragend', end);
  drake.on('cancel', cancel);
  drake.on('drag', drag);
  events.raise(item2, 'mousedown', { which: 1 });
  events.raise(item2, 'mousemove', { which: 1 });
  t.plan(7);
  t.equal(drake.dragging, true, 'final state is drake is dragging');
  t.end();
  function end (item) {
    t.equal(item, item1, 'dragend invoked with correct item');
  }
  function cancel (item, source) {
    t.equal(item, item1, 'cancel invoked with correct item');
    t.equal(source, div, 'cancel invoked with correct source');
  }
  function drag (item, container) {
    t.pass('drag event was emitted synchronously');
    t.equal(item, item2, 'first argument is selected item');
    t.equal(container, div, 'second argument is container');
  }
});

test('when already dragged, ends (drops) previous drag', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item1 = document.createElement('div');
  var item2 = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item1);
  div.appendChild(item2);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item1);
  div2.appendChild(item1);
  drake.on('dragend', end);
  drake.on('drop', drop);
  drake.on('drag', drag);
  events.raise(item2, 'mousedown', { which: 1 });
  events.raise(item2, 'mousemove', { which: 1 });
  t.plan(8);
  t.equal(drake.dragging, true, 'final state is drake is dragging');
  t.end();
  function end (item) {
    t.equal(item, item1, 'dragend invoked with correct item');
  }
  function drop (item, target, source) {
    t.equal(item, item1, 'drop invoked with correct item');
    t.equal(source, div, 'drop invoked with correct source');
    t.equal(target, div2, 'drop invoked with correct target');
  }
  function drag (item, container) {
    t.pass('drag event was emitted synchronously');
    t.equal(item, item2, 'first argument is selected item');
    t.equal(container, div, 'second argument is container');
  }
});

test('when copying, emits cloned with the copy', function (t) {
  var div = document.createElement('div');
  var item1 = document.createElement('div');
  var item2 = document.createElement('span');
  var drake = dragula([div], { copy: true });
  item2.innerHTML = '<em>the force is <strong>with this one</strong></em>';
  div.appendChild(item1);
  div.appendChild(item2);
  document.body.appendChild(div);
  drake.start(item1);
  drake.on('cloned', cloned);
  drake.on('drag', drag);
  events.raise(item2, 'mousedown', { which: 1 });
  events.raise(item2, 'mousemove', { which: 1 });
  t.plan(12);
  t.equal(drake.dragging, true, 'final state is drake is dragging');
  t.end();
  function cloned (copy, item) {
    t.notEqual(copy, item2, 'first argument is not exactly the target');
    t.equal(copy.tagName, item2.tagName, 'first argument has same tag as target');
    t.equal(copy.innerHTML, item2.innerHTML, 'first argument has same inner html as target');
    t.equal(item, item2, 'second argument is clicked item');
  }
  function drag (item, container) {
    t.pass('drag event was emitted synchronously');
    t.equal(item, item2, 'first argument is selected item');
    t.equal(container, div, 'second argument is container');
  }
});

test('when dragging, element gets gu-transit class', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.equal(item.className, 'gu-transit', 'item has gu-transit class');
  t.end();
});

test('when dragging, body gets gu-unselectable class', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.equal(document.body.className, 'gu-unselectable', 'body has gu-unselectable class');
  t.end();
});

test('when dragging, element gets a mirror image for show', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  item.innerHTML = '<em>the force is <strong>with this one</strong></em>';
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('cloned', cloned);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.plan(4);
  t.end();
  function cloned (mirror, target) {
    t.equal(item.className, 'gu-transit', 'item does not have gu-mirror class');
    t.equal(mirror.className, 'gu-mirror', 'mirror only has gu-mirror class');
    t.equal(mirror.innerHTML, item.innerHTML, 'mirror is passed to \'cloned\' event');
    t.equal(target, item, 'cloned lets you know that the mirror is a clone of `item`');
  }
});

test('when dragging, mirror element gets appended to configured mirrorContainer', function (t) {
  var mirrorContainer = document.createElement('div');
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], {
    'mirrorContainer': mirrorContainer
  });
  item.innerHTML = '<em>the force is <strong>with this one</strong></em>';
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('cloned', cloned);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.plan(1);
  t.end();
  function cloned (mirror) {
    t.equal(mirror.parentNode, mirrorContainer, 'mirrors parent is the configured mirrorContainer');
  }
});

test('when dragging stops, element gets gu-transit class removed', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.equal(item.className, 'gu-transit', 'item has gu-transit class');
  drake.end();
  t.equal(item.className, '', 'item has gu-transit class removed');
  t.end();
});

test('when dragging stops, body becomes selectable again', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.equal(document.body.className, 'gu-unselectable', 'body has gu-unselectable class');
  drake.end();
  t.equal(document.body.className, '', 'body got gu-unselectable class removed');
  t.end();
});

test('when drag begins, check for copy option', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  item.className = 'copyable';
  div.className = 'contains';
  var drake = dragula([div], {
    copy: checkCondition
  });
  item.innerHTML = '<em>the force is <strong>with this one</strong></em>';
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 }); // ensure the copy method condition is only asserted once
  t.plan(2);
  t.end();
  function checkCondition (el, source) {
    t.equal(el.className, 'copyable', 'dragged element classname is copyable');
    t.equal(source.className, 'contains', 'source container classname is contains');
    return true;
  }
  drake.end();
});
/* */

test('drag event does not fire within deadzone', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], {
    deadzone: 10
  });
  div.appendChild(item);
  document.body.appendChild(div);

  t.plan(1);
  drake.on('drag', drag);
  events.raise(item, 'mousedown', { which: 1, clientX: 0, clientY: 0 });
  events.raise(item, 'mousemove', { clientX: 1, clientY: 1 });
  t.equal(drake.dragging, false, 'final state is drake is not dragging');
  drake.destroy();
  t.end();
  function drag () {
    t.fail('drag event was emitted');
  }
});

test('drag event fires outside deadzone', function (t) {
  var div = document.createElement('section');
  var item = document.createElement('div');
  var drake = dragula([div], {
    deadzone: 10
  });
  div.appendChild(item);
  document.body.appendChild(div);

  t.plan(2);
  drake.on('drag', drag);
  events.raise(item, 'mousedown', { which: 1, clientX: 0, clientY: 0 });
  events.raise(item, 'mousemove', { clientX: 20, clientY: 20 });
  t.equal(drake.dragging, true, 'final state is drake is dragging');
  drake.destroy();
  t.end();
  function drag () {
    t.pass('drag event should be emitted');
  }
});

function always () { return true; }
function never () { return false; }

},{"..":2,"./lib/events":61,"tape":44}],58:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('drake can be instantiated without throwing', function (t) {
  t.doesNotThrow(drakeFactory, 'calling dragula() without arguments does not throw');
  t.end();
  function drakeFactory () {
    return dragula();
  }
});

test('drake has expected api properties', function (t) {
  var drake = dragula();
  t.ok(drake, 'drake is not null');
  t.equal(typeof drake, 'object', 'drake is an object');
  t.ok(Array.isArray(drake.containers), 'drake.containers is an array');
  t.equal(typeof drake.start, 'function', 'drake.start is a method');
  t.equal(typeof drake.end, 'function', 'drake.end is a method');
  t.equal(typeof drake.cancel, 'function', 'drake.cancel is a method');
  t.equal(typeof drake.remove, 'function', 'drake.remove is a method');
  t.equal(typeof drake.destroy, 'function', 'drake.destroy is a method');
  t.equal(typeof drake.dragging, 'boolean', 'drake.dragging is a boolean');
  t.equal(drake.dragging, false, 'drake.dragging is initialized as false');
  t.end();
});

},{"..":2,"tape":44}],59:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('end does not throw when not dragging', function (t) {
  t.test('a single time', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.end();
    }, 'dragula ignores a single call to drake.end');
    st.end();
  });
  t.test('multiple times', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.end();
      drake.end();
      drake.end();
      drake.end();
    }, 'dragula ignores multiple calls to drake.end');
    st.end();
  });
  t.end();
});

test('when already dragging, .end() ends (cancels) previous drag', function (t) {
  var div = document.createElement('div');
  var item1 = document.createElement('div');
  var item2 = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item1);
  div.appendChild(item2);
  document.body.appendChild(div);
  drake.start(item1);
  drake.on('dragend', end);
  drake.on('cancel', cancel);
  drake.end();
  t.plan(4);
  t.equal(drake.dragging, false, 'final state is: drake is not dragging');
  t.end();
  function end (item) {
    t.equal(item, item1, 'dragend invoked with correct item');
  }
  function cancel (item, source) {
    t.equal(item, item1, 'cancel invoked with correct item');
    t.equal(source, div, 'cancel invoked with correct source');
  }
});

test('when already dragged, ends (drops) previous drag', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item1 = document.createElement('div');
  var item2 = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item1);
  div.appendChild(item2);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.start(item1);
  div2.appendChild(item1);
  drake.on('dragend', end);
  drake.on('drop', drop);
  drake.end();
  t.plan(5);
  t.equal(drake.dragging, false, 'final state is: drake is not dragging');
  t.end();
  function end (item) {
    t.equal(item, item1, 'dragend invoked with correct item');
  }
  function drop (item, target, source) {
    t.equal(item, item1, 'drop invoked with correct item');
    t.equal(source, div, 'drop invoked with correct source');
    t.equal(target, div2, 'drop invoked with correct target');
  }
});

},{"..":2,"tape":44}],60:[function(require,module,exports){
'use strict';

var test = require('tape');
var events = require('./lib/events');
var dragula = require('..');

test('.start() emits "cloned" for copies', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], { copy: true });
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('cloned', cloned);
  drake.start(item);
  t.plan(3);
  t.end();
  function cloned (copy, original, type) {
    if (type === 'copy') {
      t.notEqual(copy, item, 'copy is not a reference to item');
      t.equal(copy.nodeType, item.nodeType, 'copy of original is provided');
      t.equal(original, item, 'original item is provided');
    }
  }
});

test('.start() emits "drag" for items', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('drag', drag);
  drake.start(item);
  t.plan(2);
  t.end();
  function drag (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.end() emits "cancel" when not moved', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('dragend', dragend);
  drake.on('cancel', cancel);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  drake.end();
  t.plan(3);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function cancel (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.end() emits "drop" when moved', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div, div2]);
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.on('dragend', dragend);
  drake.on('drop', drop);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  div2.appendChild(item);
  drake.end();
  t.plan(4);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function drop (original, target, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(target, div2, 'target matches expected div');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.remove() emits "remove" for items', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('dragend', dragend);
  drake.on('remove', remove);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  drake.remove();
  t.plan(3);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function remove (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.remove() emits "cancel" for copies', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], { copy: true });
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('dragend', dragend);
  drake.on('cancel', cancel);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  drake.remove();
  t.plan(4);
  t.end();
  function dragend () {
    t.pass('dragend got invoked');
  }
  function cancel (copy, container) {
    t.notEqual(copy, item, 'copy is not a reference to item');
    t.equal(copy.nodeType, item.nodeType, 'item is a copy of item');
    t.equal(container, null, 'container matches expectation');
  }
});

test('.cancel() emits "cancel" when not moved', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('dragend', dragend);
  drake.on('cancel', cancel);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  drake.cancel();
  t.plan(3);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function cancel (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.cancel() emits "drop" when not reverted', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.on('dragend', dragend);
  drake.on('drop', drop);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  div2.appendChild(item);
  drake.cancel();
  t.plan(4);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function drop (original, parent, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(parent, div2, 'parent matches expected div');
    t.equal(container, div, 'container matches expected div');
  }
});

test('.cancel() emits "cancel" when reverts', function (t) {
  var div = document.createElement('div');
  var div2 = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], { revertOnSpill: true });
  div.appendChild(item);
  document.body.appendChild(div);
  document.body.appendChild(div2);
  drake.on('dragend', dragend);
  drake.on('cancel', cancel);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  div2.appendChild(item);
  drake.cancel();
  t.plan(3);
  t.end();
  function dragend (original) {
    t.equal(original, item, 'item is a reference to moving target');
  }
  function cancel (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

test('mousedown emits "cloned" for mirrors', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('cloned', cloned);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.plan(3);
  t.end();
  function cloned (copy, original, type) {
    if (type === 'mirror') {
      t.notEqual(copy, item, 'mirror is not a reference to item');
      t.equal(copy.nodeType, item.nodeType, 'mirror of original is provided');
      t.equal(original, item, 'original item is provided');
    }
  }
});

test('mousedown emits "cloned" for copies', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], { copy: true });
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('cloned', cloned);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.plan(3);
  t.end();
  function cloned (copy, original, type) {
    if (type === 'copy') {
      t.notEqual(copy, item, 'copy is not a reference to item');
      t.equal(copy.nodeType, item.nodeType, 'copy of original is provided');
      t.equal(original, item, 'original item is provided');
    }
  }
});

test('mousedown emits "drag" for items', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.on('drag', drag);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  t.plan(2);
  t.end();
  function drag (original, container) {
    t.equal(original, item, 'item is a reference to moving target');
    t.equal(container, div, 'container matches expected div');
  }
});

},{"..":2,"./lib/events":61,"tape":44}],61:[function(require,module,exports){
'use strict';

function raise (el, type, options) {
  var o = options || {};
  var e = document.createEvent('Event');
  e.initEvent(type, true, true);
  Object.keys(o).forEach(apply);
  el.dispatchEvent(e);
  function apply (key) {
    e[key] = o[key];
  }
}

module.exports = {
  raise: raise
};

},{}],62:[function(require,module,exports){
'use strict';

var test = require('tape');
var dragula = require('..');

test('public api matches expectation', function (t) {
  t.equal(typeof dragula, 'function', 'dragula is a function');
  t.end();
});

},{"..":2,"tape":44}],63:[function(require,module,exports){
'use strict';

var test = require('tape');
var events = require('./lib/events');
var dragula = require('..');

test('remove does not throw when not dragging', function (t) {
  t.test('a single time', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.remove();
    }, 'dragula ignores a single call to drake.remove');
    st.end();
  });
  t.test('multiple times', function once (st) {
    var drake = dragula();
    st.doesNotThrow(function () {
      drake.remove();
      drake.remove();
      drake.remove();
      drake.remove();
    }, 'dragula ignores multiple calls to drake.remove');
    st.end();
  });
  t.end();
});

test('when dragging and remove gets called, element is removed', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.remove();
  t.equal(div.children.length, 0, 'item got removed from container');
  t.equal(drake.dragging, false, 'drake has stopped dragging');
  t.end();
});

test('when dragging and remove gets called, remove event is emitted', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div]);
  div.appendChild(item);
  document.body.appendChild(div);
  drake.start(item);
  drake.on('remove', remove);
  drake.on('dragend', dragend);
  drake.remove();
  t.plan(3);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function remove (target, container) {
    t.equal(target, item, 'remove was invoked with item');
    t.equal(container, div, 'remove was invoked with container');
  }
});

test('when dragging a copy and remove gets called, cancel event is emitted', function (t) {
  var div = document.createElement('div');
  var item = document.createElement('div');
  var drake = dragula([div], { copy: true });
  div.appendChild(item);
  document.body.appendChild(div);
  events.raise(item, 'mousedown', { which: 1 });
  events.raise(item, 'mousemove', { which: 1 });
  drake.on('cancel', cancel);
  drake.on('dragend', dragend);
  drake.remove();
  t.plan(4);
  t.end();
  function dragend () {
    t.pass('dragend got called');
  }
  function cancel (target, container) {
    t.equal(target.className, 'gu-transit', 'cancel was invoked with item');
    t.notEqual(target, item, 'item is a copy and not the original');
    t.equal(container, null, 'cancel was invoked with container');
  }
});

},{"..":2,"./lib/events":61,"tape":44}]},{},[52,53,54,55,56,57,58,59,60,62,63]);
</script>