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

Question

I have two separate projects that use npm - so I have both :
some_base_folder/projectA/package.json and some_base_folder/projectB/package.json

Answer 1

I ended up using:

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

because this also works with yarn.