Here is thereproduction.

I have seen many issues related to this (i.e. same result), but with a different cause.

@valscion any thoughts? I can dig into this more, but a slight point in the right direction would be helpful.

Thanks for the reproduction!

Ah so it's most likelyoutput.module = true that creates a bundle which the acorn parser even fails to start parsing.

Here's the function which probably would need attention to figure this out:

https://github.com/webpack-contrib/webpack-bundle-analyzer/blob/f8d4711d7670ffa9fae11cd34787cc45c538f9bb/src/parseUtils.js#L9-L17

My hunch is that thesourceType: 'script' is what causes this breakage.

I don't know if changing the sourceType would break parsing other, more commonly used output formats, though. The tests should fail if so, though.