For AI agents: the complete documentation index is available at /tc39-atlas/en/llms.txt, the full documentation bundle is available at /tc39-atlas/en/llms-full.txt, and this page is available as Markdown at /tc39-atlas/en/changes/month.md.
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      Reporting range: after Sep 12, 2026 through Oct 12, 2026 (inclusive), grouped by Asia/Shanghai daily update; data actually checked at Oct 12, 2026, 07:29 (Asia/Shanghai).

      DetectedChangeProposal
      Oct 2, 2026, 07:43Stage changed: Stage 2.7 → Stage 3Curtailing the power of "Thenables"
      Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2.7export all from
      Oct 2, 2026, 07:43Stage changed: Stage 2 → Stage 2.7Deferred Re-exports
      Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2Bigint from exponential
      Oct 2, 2026, 07:43Stage changed: Stage 2 → Stage 2.7JSON.parse options
      Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2Composites
      Oct 2, 2026, 07:43AddedAbort Controller
      Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4Iterator Includes
      Oct 1, 2026, 07:32FinishedIterator Includes
      Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4Iterator Join
      Oct 1, 2026, 07:32FinishedIterator Join
      Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4iterator chunking
      Oct 1, 2026, 07:32Finishediterator chunking
      Sep 24, 2026, 06:45Stage changed: Stage 2 → Stage 2.7Curtailing the power of "Thenables"