npm - Pass arguments from CLI through multiple scripts

Question

Let's say I have the following in a file called print-last-arg.js:

console.log(process.argv[process.argv.length-1])

And the following scripts in my package.json:

"scripts": {
  "print_a": "node print-last-arg.js",
  "print_b": "npm run print_a"
}

When I run npm run print_a -- --foo=bar, I get --foo=bar as expected.

However, npm run print_b -- --foo=bar gives me no output.

How do I pass the CLI arguments from print_b to print_a?

Possible duplicate of How to pass a command line argument to a nested script? — RobC
– RobC, Commented Nov 22, 2018 at 9:03

ethan.roday · Accepted Answer · 2018-11-22 00:15:44Z

2

It turns out that you just have to add an extra -- on the end of print_b, which will tell npm to pass whatever arguments print_b got to print_a. So,

"scripts": {
  "print_a": "node print-last-arg.js",
  "print_b": "npm run print_a"
}

becomes

"scripts": {
  "print_a": "node print-last-arg.js",
  "print_b": "npm run print_a -- "
}

Voilà! Now npm run print_b -- --foo=bar prints --foo=bar as expected.

answered Nov 22, 2018 at 0:15

ethan.roday

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