3.34.0 - 2023.12.06

• Array grouping proposal:
  • Methods:
    • Object.groupBy
    • Map.groupBy
  • Moved to stable ES, November 2023 TC39 meeting
  • Added es. namespace modules, /es/ and /stable/ namespaces entries
• Promise.withResolvers proposal:
  • Method:
    • Promise.withResolvers
  • Moved to stable ES, November 2023 TC39 meeting
  • Added es. namespace module, /es/ and /stable/ namespaces entries
• Fixed a web incompatibility issue of Iterator helpers proposal, proposal-iterator-helpers/287 and some following changes, November 2023 TC39 meeting
• Added Uint8Array to / from base64 and hex stage 2 proposal:
  • Methods:
    • Uint8Array.fromBase64
    • Uint8Array.fromHex
    • Uint8Array.prototype.toBase64
    • Uint8Array.prototype.toHex
• Relaxed some specific cases of Number.fromString validation before clarification of proposal-number-fromstring/24
• Fixed @@toStringTag property descriptors on DOM collections, #1312
• Fixed the order of arguments validation in Array iteration methods, #1313
• Some minor atob / btoa improvements
• Compat data improvements:
  • Promise.withResolvers marked as shipped from FF121

3.33.3 - 2023.11.20

• Fixed an issue getting the global object on Duktape, #1303
• Avoid sharing internal [[DedentMap]] from String.dedent proposal between core-js instances before stabilization of the proposal
• Some internal untangling
• Compat data improvements:
  • Added Deno 1.38 compat data mapping
  • Array.fromAsync marked as supported from Deno 1.38
  • Symbol.{ dispose, asyncDispose } marked as supported from Deno 1.38
  • Added Opera Android 79 compat data mapping
  • Added Oculus Quest Browser 30 compat data mapping
  • Updated Electron 28 and 29 compat data mapping

3.33.2 - 2023.10.31

• Simplified structuredClone polyfill, avoided second tree pass in cases of transferring
• Added support of SuppressedError to structuredClone polyfill
• Removed unspecified unnecessary ArrayBuffer and DataView dependencies of structuredClone lack of which could cause errors in some entries in IE10-
• Fixed handling of fractional number part in Number.fromString
• Compat data improvements:
  • URL.canParse marked as supported from Chromium 120
  • Updated Opera Android 78 compat data mapping
  • Added Electron 29 compat data mapping

3.33.1 - 2023.10.20

• Added one more workaround of possible error with Symbol polyfill on global object, #1289
• Directly specified type: commonjs in package.json of all packages to avoid potential breakage in future Node versions, see this issue
• Prevented potential issue with lack of some dependencies after automatic optimization polyfills of some methods in the pure version
• Some minor internal fixes and optimizations
• Compat data improvements:
  • String.prototype.{ isWellFormed, toWellFormed } marked as supported from FF119
  • Added React Native 0.73 Hermes compat data, mainly fixes of some issues
  • Added NodeJS 21.0 compat data mapping

3.33.0 - 2023.10.02

• Re-introduced RegExp escaping stage 2 proposal, September 2023 TC39 meeting:
  • Added RegExp.escape method with the new set of symbols for escaping
  • Some years ago, it was presented in core-js, but it was removed after rejecting the old version of this proposal
• Added ArrayBuffer.prototype.{ transfer, transferToFixedLength } and support transferring of ArrayBuffers via structuredClone to engines with MessageChannel
• Optimized Math.f16round polyfill
• Fixed some conversion cases of Math.f16round and DataView.prototype.{ getFloat16, setFloat16 }
• Fully forced polyfilling of the TC39 Observable proposal because of incompatibility with the new WHATWG Observable proposal
• Added an extra workaround of errors with exotic environment objects in Symbol polyfill, #1289
• Some minor fixes and stylistic changes
• Compat data improvements:
  • V8 unshipped Iterator helpers because of some Web compatibility issues
  • Promise.withResolvers marked as supported from V8 ~ Chrome 119
  • Array grouping proposal features marked as supported from FF119
  • value argument of URLSearchParams.prototype.{ has, delete } marked as properly supported from V8 ~ Chrome 118
  • URL.canParse and URLSearchParams.prototype.size marked as supported from Bun 1.0.2
  • Added Deno 1.37 compat data mapping
  • Added Electron 28 compat data mapping
  • Added Opera Android 78 compat data mapping

3.32.2 - 2023.09.07

• Fixed structuredClone feature detection [email protected] bug, #1288
• Added a workaround of old WebKit + eval bug, #1287
• Compat data improvements:
  • Added Samsung Internet 23 compat data mapping
  • Added Quest Browser 29 compat data mapping

3.32.1 - 2023.08.19

• Fixed some cases of IEEE754 rounding, #1279, thanks @petamoriken
• Prevented injection process polyfill to core-js via some bundlers or esm.sh, #1277
• Some minor fixes and stylistic changes
• Compat data improvements:
  • Promise.withResolvers marked as supported from Bun 0.7.1
  • Added Opera Android 77 compat data mapping
  • Updated Electron 27 compat data mapping

3.32.0 - 2023.07.28

• Array grouping proposal, July 2023 TC39 meeting updates:
  • Moved back to stage 3
  • Added /actual/ namespaces entries, unconditional forced replacement changed to feature detection
• Promise.withResolvers proposal, July 2023 TC39 meeting updates:
  • Moved to stage 3
  • Added /actual/ namespaces entries, unconditional forced replacement changed to feature detection
• Set methods stage 3 proposal, July 2023 TC39 meeting updates::
  • Throw on negative Set sizes, proposal-set-methods/88
  • Removed IsCallable check in GetKeysIterator, proposal-set-methods/101
• Iterator Helpers stage 3 proposal:
  • Avoid creating observable String wrapper objects, July 2023 TC39 meeting update, proposal-iterator-helpers/281
  • Iterator is not constructible from the active function object (works as an abstract class)
• Async explicit resource management:
  • Moved back into the initial proposal -> moved to stage 3, proposal-explicit-resource-management/154
  • Added /actual/ namespace entries, unconditional forced replacement changed to feature detection
  • Ignore return value of [@@dispose]() method when hint is async-dispose, proposal-explicit-resource-management/180
  • Added ticks for empty resources, proposal-explicit-resource-management/163
• Added some methods from Float16Array stage 3 proposal:
  • There are some reason why I don't want to add Float16Array right now, however, make sense to add some methods from this proposal.
  • Methods:
    • Math.f16round
    • DataView.prototype.getFloat16
    • DataView.prototype.setFloat16
• Added DataView get / set Uint8Clamped methods stage 1 proposal:
  • Methods:
    • DataView.prototype.getUint8Clamped
    • DataView.prototype.setUint8Clamped
• Used strict mode in some missed cases, #1269
• Fixed a Chromium 117 bug in value argument of URLSearchParams.prototype.{ has, delete }
• Fixed early WebKit ~ Safari 17.0 beta Set methods implementation by the actual spec
• Fixed incorrect Symbol.{ dispose, asyncDispose } descriptors from NodeJS 20.4 / transpilers helpers / userland code
• Fixed forced polyfilling of some iterator helpers that should return wrapped iterator in the pure version
• Fixed and exposed AsyncIteratorPrototype core-js/configurator option, #1268
• Compat data improvements:
  • Sync Iterator helpers proposal features marked as supported from V8 ~ Chrome 117
  • Array grouping proposal features marked as supported from V8 ~ Chrome 117
  • Mark Symbol.{ dispose, asyncDispose } as supported from NodeJS 20.5.0 (as mentioned above, NodeJS 20.4.0 add it, but with incorrect descriptors)
  • Added Electron 27 compat data mapping

3.31.1 - 2023.07.06

• Fixed a structuredClone bug with cloning views of transferred buffers, #1265
• Fixed the order of arguments validation in DataView methods
• Allowed cloning of Float16Array in structuredClone
• Compat data improvements:
  • Set methods proposal marked as supported from Safari 17.0
  • New URL features: URL.canParse, URLSearchParams.prototype.size and value argument of URLSearchParams.prototype.{ has, delete } marked as supported from Safari 17.0
  • value argument of URLSearchParams.prototype.{ has, delete } marked as supported from Deno 1.35
  • AggregateError and well-formed JSON.stringify marked as supported React Native 0.72 Hermes
  • Added Deno 1.35 compat data mapping
  • Added Quest Browser 28 compat data mapping
  • Added missing NodeJS 12.16-12.22 compat data mapping
  • Updated Opera Android 76 compat data mapping

3.31.0 - 2023.06.12

• Well-formed unicode strings proposal:
  • Methods:
    • String.prototype.isWellFormed method
    • String.prototype.toWellFormed method
  • Moved to stable ES, May 2023 TC39 meeting
  • Added es. namespace modules, /es/ and /stable/ namespaces entries
• Array grouping proposal, May 2023 TC39 meeting updates:
  • Because of the web compat issue, moved from prototype to static methods. Added:
    • Object.groupBy method
    • Map.groupBy method (with the actual semantic - with a minor difference it was present in the collections methods stage 1 proposal)
  • Demoted to stage 2
• Decorator Metadata proposal, May 2023 TC39 meeting updates:
  • Moved to stage 3
  • Added Function.prototype[Symbol.metadata] (=== null)
  • Added /actual/ entries
• Iterator Helpers stage 3 proposal:
  • Changed Symbol.iterator fallback from callable check to undefined / null check, May 2023 TC39 meeting, proposal-iterator-helpers/272
  • Removed IsCallable check on NextMethod, deferring errors to Call site, May 2023 TC39 meeting, proposal-iterator-helpers/274
• Added Promise.withResolvers stage 2 proposal:
  • Promise.withResolvers method
• Symbol predicates stage 2 proposal:
  • The methods renamed to end with Symbol, May 2023 TC39 meeting:
    • Symbol.isRegistered -> Symbol.isRegisteredSymbol method
    • Symbol.isWellKnown -> Symbol.isWellKnownSymbol method
• Added value argument of URLSearchParams.prototype.{ has, delete }, url/735
• Fixed some cases of increasing buffer size in ArrayBuffer.prototype.{ transfer, transferToFixedLength } polyfills
• Fixed awaiting async AsyncDisposableStack.prototype.adopt callback, #1258
• Fixed URLSearchParams#size in ES3 engines (IE8-)
• Added a workaround in Object.{ entries, values } for some IE versions bug with invisible integer keys on null-prototype objects
• Added TypeScript definitions to core-js-compat, #1235, thanks @susnux
• Compat data improvements:
  • Set.prototype.difference that was missed in Bun because of a bug added in 0.6.0
  • Array.prototype.{ group, groupToMap } marked as no longer supported in WebKit runtimes because of the mentioned above web compat issue. For example, it's disabled from Bun 0.6.2
  • Methods from the change Array by copy proposal marked as supported from FF115
  • Array.fromAsync marked as supported from FF115
  • URL.canParse marked as supported from FF115
  • value argument of URLSearchParams.prototype.{ has, delete } marked as supported from NodeJS 20.2.0 and FF115
  • Added Deno 1.34 compat data mapping
  • Added Electron 26 compat data mapping
  • Added Samsung Internet 22 compat data mapping
  • Added Opera Android 75 and 76 compat data mapping
  • Added Quest Browser 27 compat data mapping