[BUG] trap 'exit 0' SIGINT doesn't work in npm scripts

[rafgraph]

Current Behavior:

trap 'exit 0' SIGINT in an npm script doesn't seem work. I use this to preform clean up after exiting running watch scripts with ctrl c (maybe there's a better way to do this?).

  "scripts": {
    "dev": "npm link && npm run watch && npm unlink -g react-router-hash-link",
    "watch": "trap 'exit 0' SIGINT; babel src -d lib --watch --presets=@babel/preset-env,@babel/preset-react"
  },

In npm v6, npm run dev links the package to global node_modules, then runs the watch script which watches for changes and re-compiles, when I'm done I ctrl c, the watch script stops and npm unlink ... is run to preform cleanup.

In npm v7, after I ctrl c, that's it, nothing runs. I ran it with --loglevel silly but nothing is printed to the terminal after I ctrl c.

Expected Behavior:

For the watch script to exit with 0 after I press ctrl c and npm unlink ... to run.

Steps To Reproduce:

You can reproduce it using my react-router-hash-link repo (the dev setup is pretty simple).

git clone [email protected]:rafgraph/react-router-hash-link.git
cd react-router-hash-link
npm install
npm run dev
# the watch script should be running...
# press ctrl c

Environment:

• OS: MacOS 10.15.7
• Node: 12.8.3
• npm: 7.0.0-rc.4

[nlf]

This is interesting.. I'll do a little research and see if I can figure out what might've broken this.

In the mean time, a workaround that should do what you want would be to make your watch script look like:

"watch": "babel src -d lib --watch --presets=@babel/preset-env,@babel/preset-react || true"

Leaving the suggestion, but after some manual testing the proposed workaround does not work. I'll keep looking!

[rafgraph]

@nlf any update on this? I'm still having this issue in v7.0.3 (it's preventing me from using npm v7 regularly). Thanks.

[nlf]

i've identified the issue and am working on a fix, hopefully we'll have something for you soon!

[nlf]

hi @rafgraph! we published 7.0.6 of npm today that should resolve this for you, can you update with npm install -g npm@7 and let me know how it goes?

[rafgraph]

Yup, works great, thanks @nlf