facebook/jest — pull request #168 by dalongi (2014-11-05 20:30:41+00:00)
Title: Use the ResourceMap to match test files

Currently, when running tests w/ a file match param, jest is scanning
the filesystem twice: First to match test files, then to build the
resource map. This is quite slow on a large directory structure.

Instead, use the resource map (which contains all file paths) to match
tests.