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Currently when the extended type check fails due to an import reference that cannot be generated, the fatal diagnostic is not caught and not properly exposed as a `ts.Diagnostic` that can be gracefully handled. This is inconsistent to non-extended type checking diagnostics. This is problematic because Angular CLI applications currently fail in obscure ways because: - the CLI does not expect `getDiagnosticsForFile` to actually throw runtime errors. - the CLI does not seem to properly print these errors given the parallel workers and build excection, and those errors are especially hard to debug because there is no `stack` for `FatalDiagnosticError`'s. Example: `MyDir` is not exported and the type check block cannot reference it. PR Close #53896