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Generating sourcemaps for app code using karma and webpack

Asked By: Anonymous

I have an ES6 (Aurelia) app that I’m running unit tests for using karma with webpack and babel. I am able to generate source maps for the test files, but not for the application files. My karma.config contains something like this:

module.exports = function (config) {

    basePath: __dirname,

    frameworks: ['jasmine'],

    exclude: [],

    files: [
      { pattern: 'spec-bundle.js', watched: false }

    preprocessors: {
      'spec-bundle.js': ['webpack', 'sourcemap']

    webpack: require('../webpack.config.babel'),

    webpackServer: { noInfo: true },


My spec files are pulled into spec-bundle which looks something like this:

Error.stackTraceLimit = Infinity;


var testContext = require.context('./unit', true, /.spec.(ts|js)$/);

function requireAll(requireContext) {
  return requireContext.keys().map(requireContext);

var modules = requireAll(testContext);

The source maps for my tests are loaded fine, but I can’t get source maps for the application files to load. Further, I can’t get the source maps for the test files to not load, so I’m not even sure what is turning them on (removing the sourcemaps reference from the preprocessors does nothing).

How can I load these source maps?


Answered By: Anonymous

This is a bug in istanbul, and this is how I fixed it:

Updated my npm tasks in package.json from:

"test": "cross-env BABEL_ENV=node NODE_ENV=test ./node_modules/karma/bin/karma start test/karma.conf.js",
"test:debug": "npm test -- --single-run=false --debug"


"test": "cross-env BABEL_ENV=node NODE_ENV=test ./node_modules/karma/bin/karma start test/karma.conf.js",
"test:debug": "set mode=debug&&npm test -- --single-run=false --debug"

Then, in my webpack.config.babel, changed it from:

...(ENV === 'production' || ENV === 'development'
    ? [commonChunksOptimize({ appChunkName: 'app', firstChunk: 'aurelia-bootstrap' })]
    /* ENV === 'test' */
    : [generateCoverage({ options: { 'force-sourcemap': true, esModules: true } })]


...(ENV === 'production' || ENV === 'development'
    ? [commonChunksOptimize({ appChunkName: 'app', firstChunk: 'aurelia-bootstrap' })]
    /* ENV === 'test' */
    : process.env.mode === "debug" ? [] /* coverage breaks inline source maps */
        : [generateCoverage({ options: { 'force-sourcemap': true, esModules: true } })]

Where generateCoverage is defined up top as import generateCoverage from '@easy-webpack/config-test-coverage-istanbul'

I didn’t make any changes to karma.config or spec-bundle


I upgraded this project to Webpack version 2, which no longer supports yargs so I was not able to pass my debug arg to it. To workaround I instead turned off istanbul at the karma level. In my karma.conf.js

webpack: require('../webpack.config')({ coverage: !config.debug }),

and my updated script:

karma start test/karma.conf.js --single-run=false --debug=true

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