Analyze published type dependencies (resolve #1909)

[webpro]

Resolves #1909. Implements the emitted-declaration analysis originally requested in #248.

Type-only imports that end up in a package's emitted declaration files are part of its public API. Consumers resolve them from their own dependency tree, so the referenced packages must be in dependencies, while strict mode used to expect all type-only imports in devDependencies.

Knip now analyzes the published type surface of non-private workspaces. Entry declarations are taken from types/typings, the declaration next to main, the index.d.ts fallback, exports (with types condition precedence, wildcard patterns and null subpath exclusions) and typesVersions. The declaration graph is walked from there, including triple-slash references and relative and self-name imports.

External packages referenced by this graph count as production usage:

• In strict mode they are reported at their declaration file location when only in devDependencies or missing.
• Untyped packages map to their installed or declared @types/* counterpart, so the report names the package consumers actually need.
• Resolution follows the consumer view: .ts and .js specifiers in emitted declarations resolve to the matching .d.ts via extension aliases, and the author's tsconfig paths do not apply (the source graph still uses them).

If declaration output has not been built, Knip does not guess from source imports. The walk is bounded to declarations reachable from the published entry points; on this repository it adds about 35ms.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/knip@1912

npm i https://pkg.pr.new/@knip/language-server@1912

npm i https://pkg.pr.new/@knip/mcp@1912

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[lishaduck]

Hey, I was planning on giving this a shot, someday! What's up with everybody taking my issues? (jk)

Whoooooowhooooo! Thanks Lars! This is🔥 🔥 You've made my day and I just woke up! (Ok I should go so I can get a chance to use it but I just had to show some appreciation here.)

[webpro]

Thanks Eli. That is all much appreciated, and it means a lot coming from a true power user!