Grunt Command Line Parameters

Question

I have a Grunt build file. My build file has a task that looks like the following:

myTask: {   options: {     configFile: "config/default.js",     args: {   }   },   dev: {     configFile: 'config/local.js',     options: { args: {} },   },   test: {     configFile: 'config/remote.js',     options: { args: {} }   } } 

...

grunt.registerTask('customTask', ['myTask:dev']); grunt.registerTask('customTask-Test', ['myTask:test']); 

Currently, I can run the following from the command line:

> grunt customTask 

Everything works fine. However, I need to add the ability to do something like this:

> grunt customTask --myParam=myValue 

I need to look at the value of myParam in my "dev" task target. However, I can't figure out how to do it. I would be happy if I could just print out the value of myParam when myTask:dev is ran. In other words, I'd like to see the following when run

> grunt customTask  > grunt customTask --myParam=hello You entered hello  > grunt customTask-Test  > grunt customTask-Test --myParam=hello 

How do I do something like this?

Answer 1

This is all explained in the grunt.option page.

In your case, you could get the value of myParam with:

var target = grunt.option('myParam'); 

Answer 2

I made an example of use, where i can pass the module where i want my css.min to be created through this command line:

> grunt cssmin --target=my_module  

Gruntfile.js

module.exports = function(grunt) {      var module = grunt.option('target'); //get value of target, my_module  var cssminPath = 'assets/' + module + '/css/all.css';   grunt.initConfig({     pkg: grunt.file.readJSON('package.json'),      cssmin:{         css: {             files: [{                     src: [                         'bower_components/bootstrap/dist/css/bootstrap.min.css',                     ],                     dest: cssminPath                 }]         }     },   });   grunt.loadNpmTasks('grunt-contrib-cssmin');   grunt.registerTask('default', ['cssmin']); }