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Support trailing commas in typeof import()#61495

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nicolo-ribaudo wants to merge 1 commit intomicrosoft:mainfrom
nicolo-ribaudo:import-trailing-comma
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Support trailing commas in typeof import()#61495
nicolo-ribaudo wants to merge 1 commit intomicrosoft:mainfrom
nicolo-ribaudo:import-trailing-comma

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Fixes #61489.

The import attributes proposal added support for trailing commas in dynamic import calls. This PR's aligns TypeScript's type-level import() with JavaScript's value-level import().

@github-project-automation github-project-automation bot moved this to Not started in PR Backlog Mar 27, 2025
@typescript-bot typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Mar 27, 2025
@nicolo-ribaudo nicolo-ribaudo force-pushed the import-trailing-comma branch from dfe8cba to b70f094 Compare March 27, 2025 14:22
@github-project-automation github-project-automation bot moved this from Not started to Done in PR Backlog Apr 1, 2025
@nicolo-ribaudo nicolo-ribaudo reopened this Apr 1, 2025
@github-project-automation github-project-automation bot moved this from Done to Not started in PR Backlog Apr 1, 2025
@typescript-bot typescript-bot added For Backlog Bug PRs that fix a backlog bug and removed For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Apr 1, 2025
type T2 = typeof import('./input.js', ,);
~
!!! error TS1005: '{' expected.
!!! related TS1007 main.ts:1:39: The parser expected to find a '}' to match the '{' token here.
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This error is... weird. There's no { in the file at all.

@github-project-automation github-project-automation bot moved this from Not started to Done in PR Backlog Mar 24, 2026
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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

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Trailing comma in dynamic import should be allowed also when used in a typeof type

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