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Troubleshooting: Fatal error: watch ENOSPC on grunt watch

  The Problem When running your nodejs application, if you have a file watcher, like grunt watch or webpack watch, sometimes you may get the following error message

Fatal error: watch ENOSPC
The reason is that there are probably too many files being watched by your user. The Resolution
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
Reference http://stackoverflow.com/a/17437601

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