SystemJS Angular 2 Karma Coverage Won't Run - Need to Change To CommonJS

I have to change change my module definition in the typescript compiler to commonjs to get karma coverage to work with my project.

How can I get Karma Coverage to run against SystemJS files.

Start by reproducing the reported Karma coverage failure with SystemJS and Angular 2, then compare it with the TypeScript CommonJS configuration that currently works. Identify the missing compatibility path and verify that coverage runs against SystemJS files without requiring the module definition to change to CommonJS.

Written by the indexing model from the issue text.