The method `ts.CompilerHost.directoryExists` is optional, and was not previously handled by our ts.CompilerHost wrapper for factory and summary shims (GeneratedShimsHostWrapper). TypeScript checks for the existence of this method and silently ignores things like typeRoots if it's not found. This commit adds proper handling of directoryExists() to the shim. A test is also added which verifies typeRoots behavior works when shims are enabled. PR Close #27470
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