ECMAScript Proposals
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ECMAScript Proposals
Index
Finished
Finished (stage 4) proposals already marked in Core-JS as stable ECMAScript, they are available in core-js/stable and core-js/es namespace, you can find then in related sections of this doc. However, even for finished proposals, Core-JS provide a way to include only features for a specific proposal like core-js/proposals/proposal-name.
globalThis
Relative indexing method
Array.prototype.includes
Array.prototype.flat / Array.prototype.flatMap
Array find from last
Change Array by copy
Object.values / Object.entries
Object.fromEntries
Object.getOwnPropertyDescriptors
Accessible Object.prototype.hasOwnProperty
String padding
String.prototype.matchAll
String.prototype.replaceAll
String.prototype.trimStart / String.prototype.trimEnd
RegExp s (dotAll) flag
RegExp named capture groups
Promise.allSettled
Promise.any
Promise.prototype.finally
Symbol.asyncIterator for asynchronous iteration
Symbol.prototype.description
Well-formed JSON.stringify
Well-formed unicode strings
Stage 3
core-js/stage/3 entry point contains only stage 3 proposals, core-js/stage/2 - stage 2 and stage 3, etc.
Entry points:
core-js(-pure)/stage/3
Iterator helpers
Array.fromAsync
ArrayBuffer.prototype.transfer and friends
New Set methods
JSON.parse source text access
Explicit resource management
Symbol.metadata for decorators metadata proposal
Stage 2
Entry points:
core-js(-pure)/stage/2
Array grouping
AsyncIterator helpers
Iterator.range
Promise.withResolvers
Map.prototype.emplace
Array.isTemplateObject
String.dedent
Async explicit resource management
Symbol predicates
Stage 1
Entry points:
core-js(-pure)/stage/1
Observable
New collections methods
.of and .from methods on collection constructors
compositeKey and compositeSymbol
Array filtering
Array deduplication
Getting last item from Array
Number.fromString
Math extensions
Math.signbit
String.cooked
String.prototype.codePoints
Symbol.matcher for pattern matching
Stage 0
Entry points:
core-js(-pure)/stage/0
Function.prototype.demethodize
Function.{ isCallable, isConstructor }
URL
Pre-stage 0
Entry points:
core-js(-pure)/stage/pre