karma-rollup-preprocessor

karma-rollup-preprocessor

Preprocessor to bundle ES6 modules fly with rollup.

This preprocessor is mainly used to bundle your spec entry point but might be useful in other cases as well.

Installation

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

Configuration

The rollupPreprocessor configuration is optional. (You'll need to install more dependencies). It takes two keys: rollup and bundle.

rollup is the configuration object for rollup (See rollup.rollup for more details).

bundle is the configuration object used when generating the bundle (See bundle.generate for more details) Notice this is preprocessor and does not write a file or return the bundle, only the content of the processed file gets changed. So when adding the sourceMaps options, inline is the only logical value.

Example

module.exports = function (config) {
  config.set({
    preprocessors: {
      'test/main.js': ['rollup']
    },
    rollupPreprocessor: {
      rollup: {
        plugins: [
          require('rollup-plugin-babel')({
            presets: [
              require('babel-preset-es2015-rollup')
            ]
          })
        ]
      },
      bundle: {
        sourceMap: 'inline'
      }
    }
  });
};