An error is reported after executing npm start:
Error watching file for changes: EMFILE
{"code":"EMFILE","errno":"EMFILE","syscall":"Error watching file for changes:","filename":null}
Error: Error watching file for changes: EMFILE
at exports._errnoException (util.js:949:11)
at FSEvent.FSWatcher._handle.onchange (fs.js:1400:11)
Workaround: Reinstall watchman
1. Uninstall all installed watchman: brew uninstall --force watchman
2. Delete watchman related files: rm -rf /usr/local/var/run/watchman/
3. Reinstall watchman: brew install watchman