The compiler keeps track of how a declaration has been referenced using absolute module imports and from which path the absolute module should be resolved from. There was a bug in how the .d.ts metadata extraction would incorrectly use the .d.ts file itself as resolution context for symbols that had been imported using a relative module specifier. This could result in module resolution failures. For example, when extracting NgModule metadata from `/node_modules/lib/index.d.ts` that looks like ``` import {LibDirective} from './dir'; @NgModule({ declarations: [LibDirective], exports: [LibDirective], }) export class LibModule {} ``` and `/app.module.ts` that contains ``` import {LibModule} from 'lib'; @NgModule({ imports: [LibModule], }) export class AppModule {} ``` then `AppModule` would have recorded a reference to `LibModule` using the `'lib'` module specifier. When extracting the NgModule metadata from the `/node_modules/lib/index.d.ts` file the relative import into `./dir` should also be assumed to be importable from `'lib'` (according to APF where symbols need to be exported from a single entry-point) so the reference to `LibDirective` should have `'lib'` as absolute module specifier, but it would incorrectly have `/node_modules/lib/index.d.ts` as resolution context path. The latter is incorrect as `'lib'` needs to be resolved from `/app.module.ts` and not from within the library itself. Fixes #42810 PR Close #42879
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