karma-commonjs-alias

This is a clone of karma-commonjs with additional features

Here is a link to the original repo karma-commonjs . Go there for a full list of features.

Module aliasing

Added the ability to alias modules for testing. This is useful for mocking and specifying environment. It works the same way as file aliasing in grunt-browserify. Also can alias directories, below is an example.

Here is an example karma.conf configuration

module.exports = function (config) {
    config.set({
       ...
       commonjsPreprocessor: {
          alias : {
            './config/dev.js': 'config',
            
            // Core folder alias, can be used as 'core/util/dom' instead of './js/core/util/dom'
            './js/core': 'core'
          }
       }
       ...
  });
}

In another file, you can specify the following and it will be resolve to ./config/dev.js

require('config');

NPM Module Support

Just add NPM modules to the files array and they will be available in the tests

module.exports = function (config) {
    config.set({
       ...
       files: [
          '**/*.js'
          'promise-polyfill', // NPM module used in JS files
          'observable-lite' // Another NPM module
       ]
       ...
  });
}

Transform Support

You can create transforms for other file types, for instance handlebars.

module.exports = function (config) {
    config.set({
       ...
       commonjsPreprocessor: {
          ...
          transform: {
             // Send .hbs extension to karma-commonjs-handlebars node module
             'hbs': 'karma-commonjs-handlebars'
          }
       }
       ...
  });
}

Here is an example of a transform plugin karma-commonjs-handlebars

Node/NPM Installation

npm install karma-commonjs-alias