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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. PR Close #39967