7.0.8 • Published 2 years ago
karma-rollup-preprocessor v7.0.8
karma-rollup-preprocessor
Karma preprocessor to bundle ES modules using Rollup.
Installation
npm install karma-rollup-preprocessor
Configuration
All the options detailed in the Rollup Documentation can be passed to rollupPreprocessor
.
Standard
Below is a well-founded recommendation using the Bublé ES2015 transpiler:
// karma.conf.js
module.exports = function (config) {
config.set({
files: [
/**
* Make sure to disable Karma’s file watcher
* because the preprocessor will use its own.
*/
{ pattern: 'test/**/*.spec.js', watched: false },
],
preprocessors: {
'test/**/*.spec.js': ['rollup'],
},
rollupPreprocessor: {
/**
* This is just a normal Rollup config object,
* except that `input` is handled for you.
*/
plugins: [require('rollup-plugin-buble')()],
output: {
format: 'iife', // Helps prevent naming collisions.
name: '<your_project>', // Required for 'iife' format.
sourcemap: 'inline', // Sensible for testing.
},
},
})
}
Configured Preprocessors
Below shows an example where configured preprocessors can be very helpful:
// karma.conf.js
module.exports = function (config) {
config.set({
files: [{ pattern: 'test/**/*.spec.js', watched: false }],
preprocessors: {
'test/buble/**/*.spec.js': ['rollup'],
'test/babel/**/*.spec.js': ['rollupBabel'],
},
rollupPreprocessor: {
plugins: [require('rollup-plugin-buble')()],
output: {
format: 'iife',
name: '<your_project>',
sourcemap: 'inline',
},
},
customPreprocessors: {
/**
* Clones the base preprocessor, but overwrites
* its options with those defined below...
*/
rollupBabel: {
base: 'rollup',
options: {
// In this case, to use a different transpiler:
plugins: [require('rollup-plugin-babel')()],
},
},
},
})
}
Happy bundling!
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