Files in pyrolint/ (and its subdirectories) are released under the Apache 2 licence.
This matches Arcanist: https://github.com/phacility/arcanist

Some files are modified from Pinterest/arcanist-linters (also Apache 2), see https://github.com/pinterest/arcanist-linters. The original copyright header has been retained to identify them.

All other files are released under GPL version 2 or later.