Standard Library
Symbol polyfill on global object, #1289
type: commonjs in package.json of all packages to avoid potential breakage in future Node versions, see this issue
String.prototype.{ isWellFormed, toWellFormed } marked as supported from FF119
RegExp escaping stage 2 proposal, September 2023 TC39 meeting:
RegExp.escape method with the new set of symbols for escapingcore-js, but it was removed after rejecting the old version of this proposalArrayBuffer.prototype.{ transfer, transferToFixedLength } and support transferring of ArrayBuffers via structuredClone to engines with MessageChannel
Math.f16round polyfillMath.f16round and DataView.prototype.{ getFloat16, setFloat16 }
Observable proposal because of incompatibility with the new WHATWG Observable proposal
Symbol polyfill, #1289
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 118URL.canParse and URLSearchParams.prototype.size marked as supported from Bun 1.0.2
structuredClone feature detection [email protected] bug, #1288
eval bug, #1287
process polyfill to core-js via some bundlers or esm.sh, #1277
Promise.withResolvers marked as supported from Bun 0.7.1
Array grouping proposal, July 2023 TC39 meeting updates:
/actual/ namespaces entries, unconditional forced replacement changed to feature detectionPromise.withResolvers proposal, July 2023 TC39 meeting updates:
/actual/ namespaces entries, unconditional forced replacement changed to feature detectionSet methods stage 3 proposal, July 2023 TC39 meeting updates::
Set sizes, proposal-set-methods/88
IsCallable check in GetKeysIterator, proposal-set-methods/101
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)/actual/ namespace entries, unconditional forced replacement changed to feature detection[@@dispose]() method when hint is async-dispose, proposal-explicit-resource-management/180
Float16Array stage 3 proposal:
Float16Array right now, however, make sense to add some methods from this proposal.Math.f16round
DataView.prototype.getFloat16
DataView.prototype.setFloat16
DataView get / set Uint8Clamped methods stage 1 proposal:
DataView.prototype.getUint8Clamped
DataView.prototype.setUint8Clamped
value argument of URLSearchParams.prototype.{ has, delete }
Set methods implementation by the actual specSymbol.{ dispose, asyncDispose } descriptors from NodeJS 20.4 / transpilers helpers / userland codeAsyncIteratorPrototype core-js/configurator option, #1268
Iterator helpers proposal features marked as supported from V8 ~ Chrome 117Array grouping proposal features marked as supported from V8 ~ Chrome 117Symbol.{ dispose, asyncDispose } as supported from NodeJS 20.5.0 (as mentioned above, NodeJS 20.4.0 add it, but with incorrect descriptors)structuredClone bug with cloning views of transferred buffers, #1265
DataView methodsFloat16Array in structuredClone
Set methods proposal marked as supported from Safari 17.0
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
String.prototype.isWellFormed methodString.prototype.toWellFormed methodes. namespace modules, /es/ and /stable/ namespaces entriesArray grouping proposal, May 2023 TC39 meeting updates:
Object.groupBy methodMap.groupBy method (with the actual semantic - with a minor difference it was present in the collections methods stage 1 proposal)Function.prototype[Symbol.metadata] (=== null)/actual/ entriesSymbol.iterator fallback from callable check to undefined / null check, May 2023 TC39 meeting, proposal-iterator-helpers/272
IsCallable check on NextMethod, deferring errors to Call site, May 2023 TC39 meeting, proposal-iterator-helpers/274
Promise.withResolvers stage 2 proposal:
Promise.withResolvers methodSymbol predicates stage 2 proposal:
Symbol, May 2023 TC39 meeting:
Symbol.isRegistered -> Symbol.isRegisteredSymbol methodSymbol.isWellKnown -> Symbol.isWellKnownSymbol methodvalue argument of URLSearchParams.prototype.{ has, delete }, url/735
ArrayBuffer.prototype.{ transfer, transferToFixedLength } polyfillsAsyncDisposableStack.prototype.adopt callback, #1258
URLSearchParams#size in ES3 engines (IE8-)Object.{ entries, values } for some IE versions bug with invisible integer keys on null-prototype objectscore-js-compat, #1235, thanks @susnux
Set.prototype.difference that was missed in Bun because of a bug added in 0.6.0Array.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 0.6.2Array by copy proposal marked as supported from FF115Array.fromAsync marked as supported from FF115URL.canParse marked as supported from FF115value argument of URLSearchParams.prototype.{ has, delete } marked as supported from NodeJS 20.2.0 and FF115File via structuredClone
String optimization, #1242
URL.canParse marked as supported (fixed) from NodeJS 20.1.0 and Deno 1.33.2
URL.canParse bug
JSON.parse source text access proposal features marked as supported from V8 ~ Chrome 114ArrayBuffer.prototype.transfer and friends proposal features marked as supported from V8 ~ Chrome 114URLSearchParams.prototype.size marked as supported from V8 ~ Chrome 113URL.canParse method, url/763
Set methods proposal:
Set.prototype.intersection, March 2023 TC39 meeting, proposal-set-methods/94
(Async)DisposableStack.prototype.move marks the original stack as disposed, #1226
Iterator.range proposal:
Symbol.metadata, March 2023 TC39 meeting, proposal-decorator-metadata/12
URLSearchParams.prototype.size marked as supported from FF112, NodeJS 19.8 and Deno 1.32