Commits on Feb 14, 2023

1. TreeFS: Symlink-enabled, prefix-tree implementation of FileSystem (f… …

   …acebook#926)
   
   Summary:
   Pull Request resolved: facebook#926
   
   Currently, `HasteFS` is the only implementation of the `FileSystem` interface, used by Metro to check for file existence during resolution, and to retrieve metadata (file hashes, etc) during transformation. `HasteFS` is based on a simple, performant `Map` of  real paths to metadata.
   
   This diff introduces `TreeFS`, which is based on an in-memory prefix tree representation, split on path separators, of all watched files.
   
   By using a prefix tree, we can lookup files whose paths segments are directory symlinks or files which are themselves links to other files.
   
   We use `TreeFS` in preference to `HasteFS` when `config.resolver.unstable_enableSymlinks` (default: `false`) is `true`.
   
   Reviewed By: motiz88
   
   Differential Revision: D42552999
   
   fbshipit-source-id: 2705f34436d549831b51e4773bce39094a6ec507

   

   robhogan authored and facebook-github-bot committed Feb 14, 2023
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