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The declarations imported `Throws` from @livekit/throws-transformer and used sdp-transform types, but both type packages were devDependencies, so consumers that check library types could not resolve them. Two optional properties also conflicted with their overrides under exactOptionalPropertyTypes. - copy the `Throws` type into src/utils/throws.ts (the transformer matches its `__throws` brand, not the import path) - move @types/sdp-transform to dependencies - declare IDataTrack.info and LocalTrack.processor as `| undefined` - add check:published-types, which type-checks the packed tarball in a temp project outside the repo, and run it in CI Fixes #2164 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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1egoman
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Oct 21, 2026
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| // A copy of `Throws` from `@livekit/throws-transformer/throws`. The published declarations name | ||
| // this type, and the transformer is a devDependency, so a consumer could not resolve an import | ||
| // of it. The transformer matches the `__throws` brand, not the import path: keep the brand as is. | ||
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| type Primitives = void | null | undefined | string | number | bigint | boolean | symbol; | ||
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| /** | ||
| * Branded type that encodes possible thrown errors in the return type. The error types are | ||
| * phantom types for static analysis; the runtime value is just T. | ||
| */ | ||
| export type Throws<T, E extends Error> = | ||
| | (T & { | ||
| readonly __throws?: E; | ||
| }) | ||
| | Extract<T, Primitives>; |
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suggestion: Is there some way these could pull from the npm package implementation still, but get resolved at build time into effectively the contents of this file?
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The published declarations fail to type-check in a project with
skipLibCheck: false. Thirteen source files importThrowsfrom@livekit/throws-transformer/throws, and the type stays in the emitted.d.tsfiles. That package is a devDependency, so a consumer never installs it.PCTransport.d.tsusessdp-transformtypes, but@types/sdp-transformis also a devDependency. WithexactOptionalPropertyTypeson, two declarations also contradict each other.IDataTrackdeclaresinfo?: DataTrackInfo, but theLocalDataTrackgetter returnsDataTrackInfo | undefined.LocalTrackdeclaresprocessor?: TrackProcessor<…>, butLocalAudioTrackadds| undefined. Both entries are affected:dist/srcanddist/core/types.This change adds a local copy of
Throwsinsrc/utils/throws.tsand points the 13 imports at it. The transformer detects the type by its__throwsbrand, not by the module it comes from, sopnpm throws:checkgives the same result.@types/sdp-transformmoves todependencies.IDataTrack.infoandLocalTrack.processorare declared with| undefined. WithoutexactOptionalPropertyTypes, these are the same types.The existing
check:corescript did not catch this, although it runs withskipLibCheckoff. It runs inside the repo, so module resolution walks up to the repo'snode_modulesand finds the devDependencies. The newpnpm check:published-typesscript packs the built package and installs the tarball with npm into a temp directory outside the repo. Then it type-checks all four type entries withstrict,skipLibCheck: falseandexactOptionalPropertyTypes. CI runs it intest.yamlafterbuild:clean.No runtime code changes. Consumers get one more types-only dependency,
@types/sdp-transform.Fixes #2164
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