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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.242 ·

CLAUDE_CODE_LEGACY_BUNDLE restores the old non-split bundle shape

Set CLAUDE_CODE_LEGACY_BUNDLE to true to go back to the old single-file build shape.

Use it now Notable No documentation found Internal Changes
JSON All of v2.1.242
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
BundleArea: what it touches
Internal ChangesKind: in v2.1.242,
What probably matters to youSection of the release
What

The re-bundle that turned deferred loads into real dynamic imports comes with an opt-out: set CLAUDE_CODE_LEGACY_BUNDLE to true to get the old shape. It must be truthy, so unset means everyone gets the chunked build.

Details
  • The variable was added to the allowlist of environment variables forwarded to and inspected in child processes, next to CLAUDE_CODE_DIR_SYNC_ENGINE and CLAUDE_CODE_DIR_SYNC_FFWD.
  • Paths moved out of the main bundle include the event-loop stall detector and Google auth; much of the surrounding diff is renaming churn from the same re-bundle.
Evidence

CLAUDE_CODE_LEGACY_BUNDLE, startEventLoopStallDetector

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundleCLAUDE_CODE_LEGACY_BUNDLECLAUDE_CODE_DIR_SYNC_ENGINECLAUDE_CODE_DIR_SYNC_FFWD
How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: CLAUDE_CODE_DIR_SYNC_ENGINE

See this entry in the whole of v2.1.242 →

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