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Avoid circularity error caused by requesting contextual type for late bound expando members#61232

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Andarist wants to merge 1 commit intomicrosoft:mainfrom
Andarist:fix/no-contextual-for-late-bound-expando
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Avoid circularity error caused by requesting contextual type for late bound expando members#61232
Andarist wants to merge 1 commit intomicrosoft:mainfrom
Andarist:fix/no-contextual-for-late-bound-expando

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@Andarist
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fixes #61214

f[Symbol.iterator] = function() {}
>f[Symbol.iterator] = function() {} : () => void
> : ^^^^^^^^^^
>f[Symbol.iterator] : any
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the issue was already included in the existing test suite - but it wasn't overly apparent because this test was not using strict mode so the implicit any was not reported separately

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With 6.0 out as the final release vehicle for this codebase, we're closing all PRs that don't fit the merge criteria for post-6.0 patches. If you think this was a mistake and this PR fits the post-6.0 patch criteria, please post to the 6.0 iteration issue with details (specifically, which PR and which patch criteria it satisfies).

Next steps for PRs:

  • For crash bugfixes or language service improvements, PRs are currently accepted at the typescript-go repo
  • Changes to type system behavior should wait until after 7.0, at which point mainline TypeScript development will resume in this repository with the Go codebase
  • Library file updates (lib.d.ts etc) continue to live in this repo or the DOM Generator repo as appropriate

@github-project-automation github-project-automation bot moved this from Not started to Done in PR Backlog Mar 24, 2026
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Support type inference for Symbol keys on function

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