javascript - Sending command line arguments to npm script

Javascript - Sending command line arguments to npm script

You can send command-line arguments to npm scripts by accessing them through the process.argv array within your script. Here's how you can do it:

Let's say you have an npm script defined in your package.json like this:

{ "scripts": { "myScript": "node myScript.js" } }

And you want to pass command-line arguments to myScript.js. You can access these arguments using process.argv. Here's how you can modify your myScript.js to handle command-line arguments:

// myScript.js // Accessing command-line arguments using process.argv // The first two elements of process.argv are the node executable and the script file, // so the actual command-line arguments start from index 2 const args = process.argv.slice(2); // Now you can use the 'args' array to access the command-line arguments console.log('Command-line arguments:', args);

Now, when you run npm run myScript arg1 arg2, the arg1 and arg2 will be passed as command-line arguments to your script, and you can access them within myScript.js.

Here's how you run it:

npm run myScript arg1 arg2

This will output:

Command-line arguments: [ 'arg1', 'arg2' ]

You can then parse and use these arguments in your script as needed.

Examples

  1. Passing Command Line Arguments to NPM Scripts in JavaScript: Description: Developers often need to pass command line arguments to NPM scripts for customizing behavior. This is a common requirement for automation and build processes.

    "scripts": { "myScript": "node myScript.js" }

  2. Using Process.argv to Access Command Line Arguments in JavaScript: Description: This query focuses on accessing command line arguments within a JavaScript file using the process.argv array, which contains the command line arguments passed to the Node.js process.

    const args = process.argv.slice(2);

  3. Parsing Command Line Arguments in JavaScript NPM Scripts: Description: Developers often search for methods to parse and handle command line arguments within NPM scripts, enabling dynamic behavior based on user input.

    const args = process.argv.slice(2); // Parse and handle args accordingly

  4. Creating Flexible NPM Scripts with Dynamic Arguments: Description: This query revolves around making NPM scripts more flexible by accepting dynamic arguments from the command line, enabling customization without modifying the script.

    "scripts": { "myScript": "node myScript.js" }

  5. Handling Command Line Flags in JavaScript NPM Scripts: Description: Developers seek methods to handle command line flags (e.g., --flag) within NPM scripts for enabling or disabling certain features or behaviors.

    const args = process.argv.slice(2); const flagIndex = args.indexOf('--flag'); const flagValue = flagIndex !== -1 ? args[flagIndex + 1] : null;

  6. Passing Environment Variables to NPM Scripts in JavaScript: Description: Sometimes, developers prefer passing environment variables rather than command line arguments to NPM scripts for configuration and customization.

    "scripts": { "myScript": "NODE_ENV=production node myScript.js" }

  7. Using yargs for Command Line Argument Parsing in JavaScript: Description: Developers interested in a more sophisticated command line argument parsing solution often turn to libraries like yargs for handling complex scenarios.

    const argv = require('yargs').argv;

  8. Automating Tasks with NPM Scripts and Command Line Inputs: Description: This query involves automating tasks using NPM scripts and accepting command line inputs, enabling streamlined workflows and greater efficiency.

    "scripts": { "build": "node build.js" }

  9. Dynamic Configuration of NPM Scripts Using Command Line Arguments: Description: Developers search for ways to dynamically configure NPM scripts based on command line arguments, allowing for versatile and adaptable workflows.

    "scripts": { "start": "node server.js" }

  10. Customizing NPM Script Behavior with User Input: Description: Users often look for ways to customize the behavior of NPM scripts through command line input, enabling tailored execution without modifying the script itself.

    "scripts": { "deploy": "node deploy.js" }

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