Pass arguments to “node” executable when running “

Question

node can be started with various options. Especially interesting is the --inspect flag:

node --inspect node_modules/.bin/jest some.spec.js

Is it possible to pass the --inspect flag somehow to yarn run? For example:

yarn run test --inspect some.spec.js 

There is a similar question for npm run, where it seems to be not possible.

Answer 1

I don't know that yarn run ... supports passing arguments to NodeJS, however, there are a couple of other options.

You can use the NODE_OPTIONS environment variable to pass arguments to NodeJS. For example,

export NODE_OPTIONS="--inspect"
yarn run test some.spec.js

In the package.json, you can define a script to take advantage of this:

"scripts": {
  "test": "jest",
  "test:inspect": "NODE_OPTIONS='--inspect' yarn run test"
}

And as you mentioned, you can use NodeJS directly,

node --inspect ./node_modules/jest-cli/bin/jest.js some.spec.js

As far as I know, those may be your only two options. However, both options work for both NPM and Yarn.