Add generated source map to Karma's file object

[Lalem001]

Found a solution for the misaligned lines/columns.

Fixes #36

Before:

at UserContext.it (main.spec.js:14:17)

After:

at UserContext.it (src/main.spec.js:7:15 <- main.spec.js:14:17)

[Lalem001]

@jlmakes

I am not sure how to add tests that would actually test this change.

Also, this would obliterate any sourceMap that exists from a prior preprocessor/plugin if any. Taking prior source maps into account would likely require similar logic to what is in karma-coverage. Don't know if you want to add dependencies, and I thought the 1-liner would be an easier pill to swallow.

[jlmakes]

In your estimation @Lalem001, what other use cases would have upstream preprocessors? It seems like a reasonable fix for most cases to me.

[Lalem001]

I cannot think of any. I agree it is a reasonable fix for most cases.

[jlmakes]

Hey @lephyrus thanks for your contributions! I’m going to make sure to cut a new release shortly, but I was hoping you could also share your opinion on this PR as well.

[lephyrus]

@jlmakes @Lalem001 This is wonderful. For our project, it turns

Expected false to be true.
            at UserContext.<anonymous> (src/specs.ts:92368:70)

into

Expected false to be true.
            at UserContext.<anonymous> (src/platform/browser.spec.ts:29:59 <- src/specs.ts:92160:70)

So that can be massively helpful and I was actually missing that mapping. Luckily, it also doesn't screw up other source mappings (for coverage reports, for in-browser debugging). So a clear 👍 from me.

[jlmakes]

Merged! Thank you @Lalem001 6.0.1...6.1.0