3.19.0 - 2021.10.25

• Most built-ins are encapsulated in core-js for preventing possible cases of breaking / observing the internal state by patching / deleting of them
  • Avoid .call / .apply prototype methods that could be patched
  • Avoid instanceof operator - implicit .prototype / @@hasInstance access that could be patched
  • Avoid RegExp#test, String#match and some over methods - implicit .exec and RegExp well-known symbols access that could be patched
• Clearing of Error stack from extra entries experimentally added to AggregateError, #996, in case lack of problems it will be extended to other cases
• In engines with native Symbol support, new well-known symbols created with usage Symbol.for for ensuring the same keys in different realms, #998
• Added a workaround of a BrowserFS NodeJS process polyfill bug that incorrectly reports V8 version that's used in some cases of core-js feature detection
• Fixed normalization of message AggregateError argument
• Fixed order of arguments conversion in Math.scale, a spec draft bug
• Fixed core-js-builder work in NodeJS 17, added a workaround of webpack + NodeJS 17 issue
• Added NodeJS 17.0 compat data mapping
• Added Opera Android 65 compat data mapping
• Updated Electron 16.0 compat data mapping
• Many other minor fixes and improvements

3.18.3 - 2021.10.13

• Fixed the prototype chain of AggregateError constructor that should contain Error constructor
• Fixed incorrect AggregateError.prototype properties descriptors
• Fixed InstallErrorCause internal operation
• Added NodeJS 16.11 compat data mapping
• Added Deno 1.16 compat data mapping
• Object.hasOwn marked as supported from Safari 15.1

3.18.2 - 2021.10.06

• Early { Array, %TypedArray% }.fromAsync errors moved to the promise, per the latest changes of the spec draft
• Internal ToInteger(OrInfinity) operation returns +0 for -0 argument, ES2020+ update
• Fixed theoretical problems with handling bigint in Number constructor wrapper
• Fixed String.raw with extra arguments
• Fixed some missed dependencies in entry points
• Some other minor fixes and improvements
• Refactoring

3.18.1 - 2021.09.27

• Fixed String.prototype.substr feature detection and compat data
• Removed mistakenly added .forEach from prototypes of some DOM collections where it shouldn't be, #988, #987, thanks @moorejs
• Added cause to AggregateError constructor implementation (still without adding to the feature detection)
• Families of .at and .findLast methods marked as supported in Safari TP
• Added Electron 16.0 compat data mapping

3.18.0 - 2021.09.20

• Added Array.fromAsync stage 1 proposal:
  • Array.fromAsync
  • %TypedArray%.fromAsync
• .name and .toString() on polyfilled functions improved in many different cases
• Improved internal IsConstructor and IsCallable checks
• Fixed some internal cases of GetMethod operation
• Fixed a bug of MS Edge 18- parseInt / parseFloat with boxed symbols
• Fixed es.array.{ index-of, last-index-of } compat data
• Added Deno 1.15 compat data mapping
• Some other minor fixes and optimizations

3.17.3 - 2021.09.09

• Fixed some possible problems related to possible extension of %IteratorPrototype% and %AsyncIteratorPrototype% in the future
• Fixed DOMTokenList.prototype.{ forEach, @@iterator, keys, values, entries } in old WebKit versions where element.classList is not an instance of global DOMTokenList
• Added NodeJS 16.9 compat data mapping
• Added Samsung Internet 16.0 compat data mapping

3.17.2 - 2021.09.03

• Fixed missed cases of ES3 reserved words usage, related to #980
• Fixed dependencies in one missed entry point
• Some other minor fixes and optimizations

3.17.1 - 2021.09.02

• Fixed missed modules-by-versions data

3.17.0 - 2021.09.02

• Accessible Object.prototype.hasOwnProperty (Object.hasOwn) proposal moved to the stable ES, per August 2021 TC39 meeting
• Relative indexing method (.at) proposal moved to the stable ES, per August 2021 TC39 meeting
• Exposed by default the stable version of String.prototype.at. It was not exposed because of the conflict with the alternative obsolete proposal (that will be completely removed in the next major version). For the backward compatibility, in the case of loading this proposal, it will be overwritten.
• Some more iteration closing fixes
• Fixed an ES3 reserved words usage, #980

3.16.4 - 2021.08.29

• AsyncFromSyncIterator made stricter, related mainly to AsyncIterator.from and AsyncIterator.prototype.flatMap
• Handling of optional .next arguments in (Async)Iterator methods is aligned with the current spec draft (mainly - ignoring the first passed to .next argument in built-in generators)
• Behavior of .next, .return, .throw methods on AsyncIterator helpers proxy iterators aligned with the current spec draft (built-in async generators) (mainly - some early errors moved to returned promises)
• Fixed some cases of safe iteration closing
• Fixed dependencies of some entry points