v3.36.0

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• ArrayBuffer.prototype.transfer and friends proposal:
  • Built-ins:
    • ArrayBuffer.prototype.detached
    • ArrayBuffer.prototype.transfer
    • ArrayBuffer.prototype.transferToFixedLength
  • Moved to stable ES, Febrary 2024 TC39 meeting
  • Added es. namespace modules, /es/ and /stable/ namespaces entries
• Uint8Array to / from base64 and hex proposal:
  • Methods:
    • Uint8Array.fromBase64
    • Uint8Array.fromHex
    • Uint8Array.prototype.toBase64
    • Uint8Array.prototype.toHex
  • Moved to stage 3, Febrary 2024 TC39 meeting
  • Added /actual/ namespace entries
  • Skipped adding new methods of writing to existing arrays to clarification some moments
• Promise.try proposal has been resurrected and moved to stage 2, Febrary 2024 TC39 meeting
• Added an entry point for the new TC39 proposals stage - core-js/stage/2.7 - still empty
• Fixed regression in Set.prototype.intersection feature detection
• Fixed a missed check in Array.prototype.{ indexOf, lastIndexOf, includes }, #​1325, thanks @​minseok-choe
• Fixed a missed check in Array.prototype.{ reduce, reduceRight }, #​1327, thanks @​minseok-choe
• Fixed Array.from and some other methods with proxy targets, #​1322, thanks @​minseok-choe
• Fixed dependencies loading for modules from ArrayBuffer.prototype.transfer and friends proposal in some specific cases in IE10-
• Dropped context workaround from collection static methods entries since with current methods semantic it's no longer required
• Added instance methods polyfills to entries of collections static methods that produce collection instances
• Added missed Date.prototype.toJSON to JSON.stringify entries dependencies
• Added debugging info in some missed cases
• Compat data improvements:
  • { Map, Object }.groupBy, Promise.withResolvers, ArrayBuffer.prototype.transfer and friends marked as supported from Safari 17.4
  • New Set methods fixed and marked as supported from V8 ~ Chrome 123
  • Added Deno 1.40 compat data mapping
  • Symbol.metadata marked as supported from Deno 1.40.4
  • Updated Electron 30 compat data mapping

v3.35.1

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• Fixed internal ToLength operation with bigints, #​1318
• Removed significant redundant code from String#split polyfill
• Fixed setting names of methods with symbol keys in some old engines
• Minor fix of prototype methods export logic in the pure version
• Compat data improvements:
  • Iterator helpers proposal methods marked as supported from V8 ~ Chrome 122
  • Note that V8 ~ Chrome 122 add Set methods, but they have a bug similar to Safari
  • self marked as fixed from Bun 1.0.22
  • SuppressedError and Symbol.{ dispose , asyncDispose } marked as supported from Bun 1.0.23
  • Added Oculus Quest Browser 31 compat data mapping
  • Updated Electron 29 and added Electron 30 compat data mapping

v3.35.0

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• { Map, Set, WeakMap, WeakSet }.{ from, of } became non-generic, following this and some other notes. Now they can be invoked without this, but no longer return subclass instances
• Fixed handling some cases of non-enumerable symbol keys from Symbol polyfill
• Removed unneeded NodeJS domains-related logic from queueMicrotask polyfill
• Fixed subclassing of wrapped ArrayBuffer
• Refactoring, many different minor optimizations
• Compat data improvements:
  • Array.fromAsync marked as supported from V8 ~ Chrome 121
  • It seems that the ancient Array.prototype.push bug is fixed in V8 ~ Chrome 122 (Hallelujah!)
  • ArrayBuffer.prototype.transfer and friends proposal features marked as supported from FF 122 and Bun 1.0.19
  • Object.groupBy and Map.groupBy marked as supported from Bun 1.0.19
  • Since Iterator helpers proposal methods are still not disabled in Deno, the web compatibility issue why it was disabled in Chromium makes no sense for Deno and fixed in the spec, they marked as supported from Deno 1.37
  • Added Opera Android 80 and updated Opera Android 79 compat data mapping
  • Added Samsung Internet 24 compat data mapping

v3.34.0

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• 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

v3.33.3

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• 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

v3.33.2

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• 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

v3.33.1

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• 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

v3.33.0

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• 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

v3.32.2

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• Fixed structuredClone feature detection core-js@3.32.1 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

v3.32.1

Compare Source

• 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

v3.32.0

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• 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