karma-webpack-with-fast-source-maps

karma-webpack-with-fast-source-maps

This is a fork of karma-webpack which enables file source maps

Installation

npm install --save-dev karma-webpack

Usage

// Karma configuration

module.exports = function(config) {
	config.set({
		// ... normal karma configuration

		files: [
			// all files ending in "_test"
			'test/*_test.js',
			'test/**/*_test.js'
			// each file acts as entry point for the webpack configuration
		],

		preprocessors: {
			// add webpack as preprocessor
			'test/*_test.js': ['webpack'],
			'test/**/*_test.js': ['webpack']
		},

		webpack: {
			// karma watches the test entry points
			// (you don't need to specify the entry option)
			// webpack watches dependencies

			// webpack configuration
		},

		webpackMiddleware: {
			// webpack-dev-middleware configuration
			// i. e.
			noInfo: true
		},

		plugins: [
			require("karma-webpack")
		]

	});
};

Alternative usage

This configuration is more performant, but you cannot run single test anymore (only the complete suite).

The above configuration generate a webpack bundle for each test. For many testcases this can result in many big files. The alterative configuration creates a single bundle with all testcases.

		files: [
			// only specify one entry point
			// and require all tests in there
			'test/test_index.js'
		],

		preprocessors: {
			// add webpack as preprocessor
			'test/test_index.js': ['webpack']
		},

// test/test_index.js

// require all modules ending in "_test" from the
// current directory and all subdirectories
var testsContext = require.context(".", true, /_test$/);
testsContext.keys().forEach(testsContext);

Every test file is required using the require.context and compiled with webpack into one test bundle.

Source Maps

File (Faster)

File source maps are faster and work out of the box. Use:

webpack: {
  // ...
	devtool: 'cheap-module-source-map'
}

Inline

Or, if you want inline source maps, you can use the karma-sourcemap-loader:

npm install --save-dev karma-sourcemap-loader

And then add it to your preprocessors

preprocessors: {
	'test/test_index.js': ['webpack', 'sourcemap']
}

And tell webpack to generate sourcemaps

webpack: {
  // ...
	devtool: 'inline-source-map'
}

Options

This is the full list of options you can specify in your Karma config.

webpack

Webpack configuration.

webpackMiddleware

Configuration for webpack-dev-middleware.

License

Copyright 2014-2015 Tobias Koppers

MIT