How to execute npm script using grunt-run?

Question

I have a npm task in my package.json file as follows to execute jest testing:

  "scripts": {
    "test-jest": "jest",
    "jest-coverage": "jest --coverage"
  },
  "jest": {
    "testEnvironment": "jsdom"
  },

I want to execute this task npm run test-jest using grunt. I installed grunt-run for the same and added the run task, but how do I invoke this npm task there?

    run: {
        options: {
          // Task-specific options go here.
        },
        your_target: {
          cmd: 'node'
        }
      }

Answer 1

Configure your Gruntfile.js similar to the example shown in the docs.

1. Set the value for the cmd to npm.
2. Set run and test-jest in the args Array.

Gruntfile.js

module.exports = function (grunt) {

  grunt.loadNpmTasks('grunt-run');

  grunt.initConfig({
    run: {
      options: {
        // ...
      },
      npm_test_jest: {
        cmd: 'npm',
        args: [
          'run',
          'test-jest',
          '--silent'
        ]
      }
    }
  });

  grunt.registerTask('default', [ 'run:npm_test_jest' ]);

};

Running

Running $ grunt via your CLI using the configuration shown above will invoke the npm run test-jest command.

Note: Adding --silent (or it's shorthand equivalent -s) to the args Array simply helps avoids the additional npm log to the console.

---

EDIT:

Cross Platform

Using the grunt-run solution shown above failed on Windows OS when running via cmd.exe. The following error was thrown:

Error: spawn npm ENOENT Warning: non-zero exit code -4058 Use --force to continue.

For a cross-platform solution consider installing and utlizing grunt-shell to invoke the npm run test-jest instead.

npm i -D grunt-shell

Gruntfile.js

module.exports = function (grunt) {

  require('load-grunt-tasks')(grunt); // <-- uses `load-grunt-tasks`

  grunt.initConfig({
    shell: {
      npm_test_jest: {
        command: 'npm run test-jest --silent',
      }
    }
  });

  grunt.registerTask('default', [ 'shell:npm_test_jest' ]);

};

Notes

1. grunt-shell requires load-grunt-tasks for loading the Task instead of the typical grunt.loadNpmTasks(...), so you'll need to install that too:

npm i -D load-grunt-tasks

2. For older version of Windows I had to install an older version of grunt-shell, namely version 1.3.0, so I recommend installing an earlier version.

npm i -D grunt-shell@1.3.0

---

EDIT 2

grunt-run does seem to work on Windows if you use the exec key instead of the cmd and args keys...

For cross platform purposes... I found it necessary to specify the command as a single string using the exec key as per the documentation that reads:

If you would like to specify your command as a single string, useful for specifying multiple commands in one task, use the exec: key

Gruntfile.js

module.exports = function (grunt) {

  grunt.loadNpmTasks('grunt-run');

  grunt.initConfig({
    run: {
      options: {
        // ...
      },
      npm_test_jest: {
        exec: 'npm run test-jest --silent' // <-- use the exec key.
      }
    }
  });

  grunt.registerTask('default', [ 'run:npm_test_jest' ]);

};