Introduction to npm-run-all

npm-run-all is a powerful Node.js tool that allows you to manage and run multiple npm scripts concurrently or sequentially. By using npm-run-all, you can simplify and speed up your development workflow, ensuring that tasks are executed as expected.

Key Features and APIs

Here are some of the most useful APIs provided by npm-run-all:

Running Scripts Concurrently

To run multiple npm scripts concurrently, you can use the run-p command.

  
  "scripts": {
    "start:app": "node app.js",
    "start:server": "node server.js",
    "start:all": "run-p start:app start:server"
  }
  

This example demonstrates how to run both app.js and server.js at the same time using npm-run-all.

Running Scripts Sequentially

To run multiple npm scripts in a specific order, you can use the run-s command.

  
  "scripts": {
    "clean": "rimraf dist",
    "build": "webpack --config webpack.config.js",
    "start": "node server.js",
    "deploy": "run-s clean build start"
  }
  

This sequence ensures that the project is cleaned, built, and then started in the correct order.

Advanced Usage

npm-run-all also supports glob patterns, npm pre/post hooks, and parallel/sequential execution modes:

  
  "scripts": {
    "lint": "eslint src/ tests/",
    "test": "mocha tests/",
    "build": "babel src/ -d dist/",
    "start": "run-s lint test build"
  }
  

Example Application

Let’s create an example application that uses npm-run-all to manage tasks efficiently.

  
  "scripts": {
    "clean": "rimraf dist",
    "compile": "babel src/ -d dist/",
    "lint": "eslint src/",
    "test": "mocha tests/",
    "build": "run-s clean lint compile",
    "watch": "onchange 'src/**/*.js' -- run-s lint compile",
    "start": "node dist/app.js",
    "dev": "run-p watch start"
  }
  

In this example, npm-run-all helps to streamline the development process by cleaning the project, linting source code, compiling JavaScript files, running tests, and starting the application in development mode.

By incorporating npm-run-all into your workflow, you can significantly enhance productivity and maintain cleaner and more manageable npm scripts.

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