56bd21de6f
For the last years the Angular repositories relied on `ts-api-guardian` for testing the public API signature. This project worked well in general but its another inconvenience to maintain if we could rely on Microsoft's `api-extractor` tool. Especially since with TypeScript 4.3 issues with export aliases appeared that would require us to extend TS API guardian to support such exports. This is not as straightforward as it sounds, given it requires rewriting of declarations to show-case the proper name in the API golden. Microsoft's API extractor has integrated support for this. As of TypeScript 4.3, we want to start using the new `override` keyword. We are not able to use that keyword currently because an old version of API extractor is used in the `ng_module` rule to flatten the types into a single file. To fix this, we need to update `api-extractor`, but this unveils the issue with TS API guardian because the most recent version of api-extractor uses alias exports to avoid potential conflicts with globals available through the TypeScript default libraries (e.g. `dom.d.ts`). PR Close #42688
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