Watches files and records, or triggers actions, when they change.
Watchman exists to watch files and record when they actually change. It can also trigger actions (such as rebuilding assets) when matching files change.
Head on over to https://facebook.github.io/watchman/
Watchman is made available under the terms of the Apache License 2.0. See the LICENSE file that accompanies this distribution for the full text of the license.
Please see the contributing guide.