karma-rollup-preprocessor

Karma preprocessor to bundle ES6 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: [
			'src/**/*.js',
			'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!

Changelog

[3.0.0] - 2016-12-02

A special thanks to @klaascuvelier who originally authored this repository, and has passed the torch to @jlmakes to keep things in tidy working order.

Added

• File changes now properly re-bundle all watched dependencies. @brianmhunt #3 #11
• Generated bundles are now cached for faster re-bundling. #10
• Error log output has been improved for readability.

Changed

• Breaking: The 2.0.0 change that split preprocessor options has been reverted.
• Rollup dependency range changed to anything < 1.0.0. #12 #13
• Travis CI now tests in Node 0.12, 4 and 6.
• Updated karma-jasmine to latest major version.

Fixed

• Test script now uses explicit path to Karma binary.

Removed

• Preprocessor no longer sets a default bundle format.