Paul Gschwendtner
d4d76ead80
Currently when application source code references e.g. an NgModule that points to references that aren't available, the compiler will break at runtime without any actionable/reasonable error. This could happen for example when a library is referenced in code, but the library is simply not available in the `node_modules`. Clearly, TypeScript would issue import diagnostics here, but the Angular compiler shouldn't break fatally. This is useful for migrations which may run against projects which aren't fully compilable. The compiler handles this fine in all cases, except when processing `.d.ts` currently... and the runtime exception invalides all other information of the program etc. This commit fixes this by degrading such unexpected cases for `.d.ts` metadata reading to be handled gracefully. This matches existing logic where the `.d.ts` doesn't necessarily match the "expecation"/"expected format". The worst case is that the Angular compiler will not have type information for some directives of e.g. a library that just isn't installed in local `node_modules`; compared to magical errors and unexpected runtime behavior. PR Close #58515
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