Type Enum

[blond]

const BemEntityName = require('@bem/entity-name');

const buttonName = new BemEntityName({ block: 'button' });
const buttonTextName = new BemEntityName({ block: 'button', elem: 'text' });
const buttonTextBoldName = new BemEntityName({ block: 'button', elem: 'text', mod: 'bold' });

buttonName.type === BemEntityName.TYPES.BLOCK // true
buttonTextName.type === BemEntityName.TYPES.ELEM // true
buttonName.type === BemEntityName.TYPES.ELEM_MOD // true

[blond]

We can force to use TYPES if enum will contains Symbols.

const BemEntityName = require('@bem/entity-name');

const name = new BemEntityName({ block: 'block' });

name.block // Symbol(BLOCK),

name.block === BemEntityName.TYPES.BLOCK // true
name.block === Symbol('BLOCK') // false

BemEntityName.TYPES

// ➜ Enum {
//    BLOCK: Symbol(BLOCK),
//    BLOCK_MOD: Symbol(BLOCK_MOD),
//    ELEM: Symbol(ELEM),
//    ELEM_MOD: Symbol(ELEM_MOD)
// }

see https://github.com/wwayne/es6-enum