isabella232 / karma-rollup-preprocessor

Karma preprocessor to bundle ES2015 modules using Rollup.

Karma preprocessor to bundle ES2015 modules using Rollup.

Features

• Rebundles your files when watched dependencies change
• Caches bundle output for improved performance
• Maintained with by @jlmakes

Installation

npm install karma-rollup-preprocessor --save-dev

Configuration

All the options detailed in the Rollup Documentation can be passed to rollupPreprocessor.

Example

Below is a well-founded recommendation using the Bublé ES2015 transpiler:

// karma.conf.js
module.exports = function (config) {
	config.set({

		files: [
			// watch src files for changes but
			// don't load them into the browser.
			{ pattern: 'src/**/*.js', included: false },
			'test/**/*.spec.js',
		],

		preprocessors: {
			'src/**/*.js': ['rollup'],
			'test/**/*.spec.js': ['rollup'],
		},

		rollupPreprocessor: {
			plugins: [
				require('rollup-plugin-buble')(),
			],
			format: 'iife',               // helps prevent naming collisions
			moduleName: '<your_project>', // required for 'iife' format
			sourceMap: 'inline',          // sensible for testing
		},
	});
};

Support

Supports all Rollup plug-ins, and works on Node 0.12.x and up. Happy bundling!