114 lines
2.8 KiB
Markdown
114 lines
2.8 KiB
Markdown
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# `karma-rollup-preprocessor`
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Karma preprocessor to bundle ES modules using Rollup.
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<p>
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<a href="https://travis-ci.org/jlmakes/karma-rollup-preprocessor">
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<img src="https://img.shields.io/travis/jlmakes/karma-rollup-preprocessor?color=black&style=for-the-badge" alt="Build Status">
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</a>
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<a href="https://www.npmjs.com/package/karma-rollup-preprocessor">
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<img src="https://img.shields.io/npm/dm/karma-rollup-preprocessor?color=black&style=for-the-badge" alt="Downloads">
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</a>
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<a href="https://www.npmjs.com/package/karma-rollup-preprocessor">
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<img src="https://img.shields.io/npm/v/karma-rollup-preprocessor?color=black&style=for-the-badge" alt="Version">
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</a>
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<a href="https://opensource.org/licenses/MIT">
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<img src="https://img.shields.io/badge/license-MIT-blue?color=black&style=for-the-badge" alt="MIT License">
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</a>
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</p>
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<br>
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## Installation
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```bash
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npm install karma-rollup-preprocessor
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```
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<br>
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## Configuration
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All the options detailed in the [Rollup Documentation](https://github.com/rollup/rollup/wiki/JavaScript-API) can be passed to `rollupPreprocessor`.
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### Standard
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Below is a well-founded recommendation using the [Bublé](https://buble.surge.sh) ES2015 transpiler:
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```js
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// karma.conf.js
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module.exports = function (config) {
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config.set({
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files: [
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/**
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* Make sure to disable Karma’s file watcher
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* because the preprocessor will use its own.
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*/
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{ pattern: 'test/**/*.spec.js', watched: false },
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],
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preprocessors: {
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'test/**/*.spec.js': ['rollup'],
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},
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rollupPreprocessor: {
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/**
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* This is just a normal Rollup config object,
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* except that `input` is handled for you.
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*/
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plugins: [require('rollup-plugin-buble')()],
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output: {
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format: 'iife', // Helps prevent naming collisions.
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name: '<your_project>', // Required for 'iife' format.
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sourcemap: 'inline', // Sensible for testing.
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},
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},
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})
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}
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```
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<br>
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### Configured Preprocessors
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Below shows an example where [configured preprocessors](http://karma-runner.github.io/1.0/config/preprocessors.html) can be very helpful:
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```js
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// karma.conf.js
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module.exports = function (config) {
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config.set({
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files: [{ pattern: 'test/**/*.spec.js', watched: false }],
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preprocessors: {
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'test/buble/**/*.spec.js': ['rollup'],
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'test/babel/**/*.spec.js': ['rollupBabel'],
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},
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rollupPreprocessor: {
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plugins: [require('rollup-plugin-buble')()],
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output: {
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format: 'iife',
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name: '<your_project>',
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sourcemap: 'inline',
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},
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},
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customPreprocessors: {
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/**
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* Clones the base preprocessor, but overwrites
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* its options with those defined below...
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*/
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rollupBabel: {
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base: 'rollup',
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options: {
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// In this case, to use a different transpiler:
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plugins: [require('rollup-plugin-babel')()],
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},
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},
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},
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})
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}
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```
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Happy bundling! 
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