Error: Error watching file for changes: EMFILE

Hello, Extension shows error at output:

pure node --harmony project, no babel anywhere, npm test = node --harmony node_modules/.bin/jest

[ntwb]

Looks like I’ve solved this for myself, for now, after reading many of the conflicting reports that watchman or fb-watchman being installed, or not installed I’ve not touched any of that for fear of perpetuating that side of things.

Anyways, I had tried removing node_modules and reinstalling, that worked once or twice, I restarted the Finder app, because, open files, again this issue kept reappearing

Next I thought that Jest was trying to watch all the files in /node_modules, wondering if like much of these tools they will inherit the ignore path from the .gitignore, went looking at the docs and no mention of Jest doing that.

Side Note: I believe testPathIgnorePatterns ignores /node_modules by default

Thus I tried adding /node_modules to watchPathIgnorePatterns

Yup, this now works for me, consistently, with this not set Jest fails to start in watch mode, setting this Jest will start and restart in watch mode successfully

"jest": {
	"watchPathIgnorePatterns": [
		"/node_modules/"
	]
}

The above is in my package.json file, I’ll try updating it in some Jest config files and shared configs a bit later

There’s a few Jest issues that state the above works as a workaround but not the ideal solution, it was supposedly fixed in Jest 24.8.0, but not for everyone and the above workaround is still required

So whilst the above works, the consensus appears to be that this is not the “right” solution, if you’ve complex projects this wouldn’t be ideal, so for now, this will work for me and I’ll keep an eye on the above linked Jest issue

[itaisir]

The easiest thing would be to install Watchman:

$ brew update
$ brew install watchman

If you don’t have brew, do this first:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"