Support ES6 modules about benchpress

[jeffbcross]

Usecase: benchmarks are ES6 modules that are loaded asynchronously and therefore cannot add entries to the global window.benchmarkSteps.

Benchpress doesn't care about the steps until a user starts sampling. There should never be a case where the bp.steps list (aka window.benchmarkSteps) is not available to a script, regardless of loading sync or async. This would just leave a slight possibility that someone could start sampling before all scripts are loaded.

This being the case, couldn't the benchmark that uses ES6 just load the es6-module-loader polyfill in the scripts list before any transpiled ES5 modules? Or am I missing something?

[tbosch]

Yes, you are right. So for using ES6 modules with benchpress we can do the following:

Create a run.js file that is included into the scripts array of the benchpress configuration file that does the following:

System.paths = ... ;
System.import('di/injector_benchmark').then((bm) => {
  window.benchmarkSteps.push({
    name: 'DynamicInjector',
    fn: function() { bm.run(); }
});

Also, all needed polyfills (e.g. traceur runtime and es6 module loader) need to be added to the scripts array of the benchpress configuration file as well.

Closing.