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Prior to this change, each invocation of `loadStandardTestFiles` would load the necessary files from disk. This function is typically called at the top-level of a test module in order to share the result across tests. The `//packages/compiler-cli/test/ngtsc` target has 8 modules where this call occurs, each loading their own copy of `node_modules/typescript` which is ~60MB in size, so the memory overhead used to be significant. This commit loads the individual packages into a standalone `Folder` and mounts this folder into the filesystem of standard test files, such that all file contents are no longer duplicated in memory. PR Close #38909