How to run multiple npm scripts in parallel

0 votes

In my package.json I have these two scripts:

  "scripts": {
    "start-watch": "nodemon run-babel index.js",
    "wp-server": "webpack-dev-server",
  }

I have to run these 2 scripts in parallel everytime I start developing in Node.js. The first thing I thought of was adding a third script like this:

"dev": "npm run start-watch && npm run wp-server"

but that will wait for start-watch to finish before running wp-server.

How can I run these in parallel?

Apr 24, 2020 in Java-Script by kartik
• 37,530 points
2,842 views

1 answer to this question.

0 votes

You should use npm-run-all (or concurrently, parallelshell), because it has more control over starting and killing commands. The operators &, | are bad ideas because you'll need to manually stop it after all tests are finished.

This is an example for protractor testing through npm:

scripts: {
  "webdriver-start": "./node_modules/protractor/bin/webdriver-manager update && ./node_modules/protractor/bin/webdriver-manager start",
  "protractor": "./node_modules/protractor/bin/protractor ./tests/protractor.conf.js",
  "http-server": "./node_modules/http-server/bin/http-server -a localhost -p 8000",
  "test": "npm-run-all -p -r webdriver-start http-server protractor"
}

-p = Run commands in parallel.

-r = Kill all commands when one of them finishes with an exit code of zero.

Running npm run test will start Selenium driver, start http server (to serve you files) and run protractor tests.

answered Apr 24, 2020 by Niroj
• 82,860 points

Related Questions In Java-Script

0 votes
1 answer

How do I turn a string to a json in Node.js?

Hello Kartik, Use the JSON function  JSON.parse(theString) ...READ MORE

answered Apr 24, 2020 in Java-Script by Niroj
• 82,860 points
257 views
0 votes
1 answer

How to access PHP session variables from jQuery function in a .js file?

Hello, You can produce the javascript file via ...READ MORE

answered Apr 29, 2020 in Java-Script by Niroj
• 82,860 points
7,894 views
0 votes
1 answer

How to change url after success in ajax without page reload?

Hello @kartik, Use the browser history to change ...READ MORE

answered Apr 29, 2020 in Java-Script by Niroj
• 82,860 points
6,149 views
0 votes
1 answer

How can I update NodeJS and NPM to the next versions?

Hello @kartik, First check your NPM version npm -v 1).Update ...READ MORE

answered May 5, 2020 in Java-Script by Niroj
• 82,860 points
240 views
0 votes
1 answer

Why it is necessary to refresh CSRF token per form request?

Hello, Generating a new CSRF token for each ...READ MORE

answered Mar 19, 2020 in Laravel by Niroj
• 82,860 points
2,322 views
0 votes
1 answer

What is meant by passing the variable by value and reference in PHP?

Hello, When the variable is passed as value ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,860 points
855 views
0 votes
1 answer

Connection with MySQL server using PHP. How can we do that?

Hey @kartik, You have to provide MySQL hostname, ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,860 points
262 views
0 votes
1 answer

How to retrieve or obtain data from the MySQL database using PHP?

Hello kartik,  Actually there are many functions that  ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,860 points
842 views
+1 vote
1 answer

How can we send message multiple time to a specific person or group in whatsapp using loop?

Hii @kartik,  This is simple task to send single ...READ MORE

answered Feb 28, 2020 in Java-Script by Niroj
• 82,860 points
3,288 views
0 votes
1 answer

How to print a circular structure in a JSON-like format?

Hello, You can use util.inspect(object) in node.js. It automatically ...READ MORE

answered Apr 24, 2020 in Java-Script by Niroj
• 82,860 points
1,057 views