What's up in ES2027?
summary
A fast survey of concrete features and timelines with implementation notes and tradeoffs: Temporal is nearly shipping, already in Mozilla and gated on V8 Chrome 144, array fromAsync, collection and iterator utilities, and import bytes are stage 4 or shipping in Node/browser, regex v flag and at(-1) indexing are usable now, promise.try removes an extra microtask, seedable Random and guaranteed resource cleanup target 2026, while shadow realms and composites aim for 2027 but require heavy engine work.
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chapters (26)
- 0:00Introduction
- 1:05ECMAScript naming process
- 3:11TC39 proposal stages
- 6:02Major ECMAScript editions
- 6:45String matchAll and promise combinators
- 8:31Array at method
- 11:17GroupBy alternatives
- 12:44Advanced regex features
- 14:31Promise withResolvers
- 15:16ES2025 collection utilities
- 17:22Enhanced regex syntax
- 18:46Promise.try
- 19:52Error.isError
- 21:41Base64 encoding
- 23:28Temporal proposal
- 25:15Resource cleanup
- 26:48Deferred module execution
- 30:15Array.fromAsync
- 32:27Time zone normalization
- 35:59Iterator helpers
- 37:22Importing binary assets
- 39:49Object composites
- 42:00Pipeline operator
- 44:10Property count improvements
- 45:56Promise key improvements
- 46:38Q&A
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