ECMAScript 2026 published

ECMAScript 2026 has been released.

• ecma-international.org/news/ecma-international-approves-new-standards-14
• github.com/tc39/ecma262/releases/tag/es2026
• 262.ecma-international.org/17.0
• ECMAScript Links

The following proposals have reached Stage 4 and are part of ECMAScript 2026:

• Array.fromAsync
  • [MDN] Array.fromAsync()
• Error.isError
  • [MDN] Error.isError()
• Math.sumPrecise
  • [MDN] Math.sumPrecise()
• Uint8Array to/from Base64
  • [MDN] Uint8Array.fromBase64()
  • [MDN] Uint8Array.prototype.toBase64()
  • [MDN] Uint8Array.prototype.setFromBase64()
  • [MDN] Uint8Array.fromHex()
  • [MDN] Uint8Array.prototype.toHex()
  • [MDN] Uint8Array.prototype.setFromHex()
• Iterator Sequencing
  • [MDN] Iterator.concat()
• JSON.parse source text access
  • [MDN] JSON.parse()
  • [MDN] JSON.rawJSON()
  • [MDN] JSON.isRawJSON()
• Upsert
  • [MDN] Map.prototype.getOrInsert()
  • [MDN] Map.prototype.getOrInsertComputed()
  • [MDN] WeakMap.prototype.getOrInsert()
  • [MDN] WeakMap.prototype.getOrInsertComputed()

With the exception of Error.isError() which is not available in Safari yet, all these proposals are baseline newly available. Check their compatibility before using them.

Temporal has reached Stage 4 and is expected to be published in ECMAScript 2027.