npm script command to run a script command from another package.json

You should use --prefix.

npm run [command] --prefix path/to/your/other/folder

And for yarn:

yarn --cwd path/to/your/other/folder [command]

well it turns out to be quite simple:

"scripts": {
  test_projectA:"cd ../projectA && npm run-script test"
}

I ended up using:

"scripts": {
   "job": "cd ./sub && \"$npm_execpath\" run subjob",
   ...
}

because this also works with yarn.

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