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Summary: Uses `fastfs.readWhile` to build the haste map - cuts the time needed to build the haste map in half - we don’t need to allocate memory for all JS files in the tree - we only read in as much as necessary during startup - we only read files completely that are part of the bundle - we will be able to move the transform before dependency extraction public Reviewed By: martinbigio Differential Revision: D2890933 fb-gh-sync-id: 5fef6b53458e8bc95d0251d0bcf16821581a3362