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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248

Main REPL and question dialog ship without compiler-generated memo caches

Under the hood
Useful1 Signal1
REPL

The main REPL and question dialog dropped their compiler memo caches, possibly re-rendering more.

What

The top-level REPL component and the ask-user-question dialog are now plain functions using ordinary hooks, without the memo-slot arrays and cache comparisons the React Compiler produced for them previously. The only user-visible consequence would be extra re-render work.

Details
  • The existing escape hatches are untouched: CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL still disables virtual scrolling, CLAUDE_CODE_DISABLE_TERMINAL_TITLE still disables terminal title updates, and CLAUDE_CODE_PROACTIVE still drives the scheduled-tasks hook.
Evidence

CLAUDE_CODE_DISABLE_VIRTUAL_SCROLL

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →