fix: Chunks is not iterable when using source maps with ProfilingPlugin

[byzyk]

What kind of change does this PR introduce?

bugfix

Did you add tests for your changes?

yes, for configCases

If relevant, link to documentation update:
N/A

Summary

Fixes #6779

Does this PR introduce a breaking change?

no

Other information

[byzyk]

The problem is that in SourceMapDevToolPlugin when used with ProfilingPlugin, chunks are being passed instead of context inside compilation.hooks.afterOptimizeChunkAssets.tap callback for some reason. So the context = chunks, chunks = undefined, thus throws not iterable.

I tried to fix it by defaulting chunks to context when no context is specified but it feels like a dirty fix to me and something for sure is not working smoothly. Any thoughts on this?

cc @sokra @TheLarkInn

[sokra]

That looks like a bug in webpack/tapable...

[webpack-bot]

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[sokra]

Could you add a test?

[byzyk]

@sokra added a test case for configCases/source-map. Passing well with my dirty hack but I still haven't figured out why it happens.

[sokra]

Thanks for the test case.

I removed your hack and fixed the bug, which was in the implementation of the ProfilingPlugin. I was not a bug in tapable.