Add pint to PHPStorm File Watchers

Open your settings in PHPStorm and go to Tools > File Watchers

Add a new Custom File Watcher and use the following information:

Name: pint
File type: PHP
Program: $ProjectFileDir$/vendor/bin/pint
Arguments: $FileRelativePath$
Output paths to refresh: $FileRelativePath$
Working directory: $ProjectFileDir$