ECMAScript 2025 published

ECMAScript 2025 has been released.

• ecma-international.org/news/ecma-international-approves-new-standards-11
• github.com/tc39/ecma262/releases/tag/es2025
• 262.ecma-international.org/16.0
• ECMAScript Links

The following proposals have reached Stage 4 and are part of ECMAScript 2025:

• Duplicate named capture groups
  • [MDN] Named capturing group: (?<name>...)
• New Set methods
  • [MDN] Set.prototype.intersection()
  • [MDN] Set.prototype.union()
  • [MDN] Set.prototype.difference()
  • [MDN] Set.prototype.symmetricDifference()
  • [MDN] Set.prototype.isSubsetOf()
  • [MDN] Set.prototype.isSupersetOf()
  • [MDN] Set.prototype.isDisjointFrom()
• RegExp Modifiers
  • [MDN] Modifier: (?ims-ims:...)
• Import Attributes
  • [MDN] Import attributes
• JSON Modules
  • [MDN] Import attributes
• Sync Iterator helpers
  • [MDN] Iterator.from()
  • [MDN] Iterator.prototype.drop()
  • [MDN] Iterator.prototype.every()
  • [MDN] Iterator.prototype.filter()
  • [MDN] Iterator.prototype.find()
  • [MDN] Iterator.prototype.flatMap()
  • [MDN] Iterator.prototype.forEach()
  • [MDN] Iterator.prototype.map()
  • [MDN] Iterator.prototype.reduce()
  • [MDN] Iterator.prototype.some()
  • [MDN] Iterator.prototype.take()
  • [MDN] Iterator.prototype.toArray()
• Promise.try
  • [MDN] Promise.try()
• Float16 on TypedArrays, DataView, Math.f16round
  • [MDN] Float16Array
  • [MDN] DataView.prototype.getFloat16()
  • [MDN] DataView.prototype.setFloat16()
  • [MDN] Math.f16round()
• RegExp.escape
  • [MDN] RegExp.escape()

Most of these new features have already landed in all the important browser engines. Check their compatibility before using them.

What about Temporal? It is still on Stage 3 and thus not part of ECMAScript 2025. There is currently only one conforming implementation (Spidermonkey, released in Firefox 139), but the ECMAScript process requires at least two conforming implementations in order to reach Stage 4. Temporal will likely be part of ECMAScript 2026.