Add webpack_done event.

[Backfighter]

This PR contains a:

• [ ] bugfix
• [x] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

This allows to perform certain actions once a compilation is done, when using the karma api. Example use case: Run tests every time a compilation has finished.

const { Server, runner } = require('karma');
const karma = new Server(config);
karma.start();
karma.on(
  'webpack_done', 
  () => runner.run(config, () => {})
);

Breaking Changes

None.

Additional Info

There is currently a workaround to still allow running test on every webpack compile, with webpack-karma:

const { Server, runner } = require('karma');

const karma = new Server(config);
karma.start();

let ready = false;
karma.once('browsers_ready', () => (ready = true));
executeWhenReady = func =>
  ready ? func() : emitter.once('browsers_ready', func);

executeWhenReady(startKarmaAutoRun.bind(null, config, karma));

function startKarmaAutoRun(config, emitter) {
  // We need to use once and reregister the event,
  // because the run itself triggers the file_list_modified
  // event.
  // Note that the file_list_modified event is not part of karmas public api, 
  // but it's the only way to detect the webpack rebuild until
  // https://github.com/webpack-contrib/karma-webpack/pull/430 is merged.
  KarmaRunner.run(config, () =>
    emitter.once(
      'file_list_modified',
      startKarmaAutoRun.bind(null, config, emitter)
    )
  );
}

[jsf-clabot]

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[codecov[bot]]

Codecov Report

Merging #430 into master will decrease coverage by 0.19%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
- Coverage   42.46%   42.27%   -0.20%     
==========================================
  Files           3        3              
  Lines         219      220       +1     
  Branches       48       48              
==========================================
  Hits           93       93              
- Misses        103      104       +1     
  Partials       23       23              

Impacted Files	Coverage Δ
src/karma-webpack.js	46.73% <0.00%> (-0.24%)	:arrow_down:

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[codymikol]

Are you still interested in this?

[Backfighter]

Personally no. I have moved on from the project this would have been beneficial for. Nonetheless I still consider it to potentially provide value to others.