c7c5b2fc1e
When the compiler is invoked via ngc or the Angular CLI, its APIs are used under the assumption that Angular analysis/diagnostics are only requested if the program has no TypeScript-level errors. A result of this assumption is that the incremental engine has not needed to resolve changes via its dependency graph when the program contained broken imports, since broken imports are a TypeScript error. The Angular Language Service for Ivy is using the compiler as a backend, and exercising its incremental compilation APIs without enforcing this assumption. As a result, the Language Service has run into issues where broken imports cause incremental compilation to fail and produce incorrect results. This commit introduces a mechanism within the compiler to keep track of files for which dependency analysis has failed, and to always treat such files as potentially affected by future incremental steps. This is tested via the Language Service infrastructure to ensure that the compiler is doing the right thing in the case of invalid imports. PR Close #39923
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