vue-loader is incompatible with remap-istanbul because of missing "file" property on sourcemap.

[Ross-Esmond]

Version

14.2.1

Reproduction link

https://github.com/scry/VueCoverage

Steps to reproduce

clone the repo, yarn install, karma start.

Karma will break because of these lines in remap-istanbul.

remap-istanbul expects sourcemaps to have the "file" property, but vue-loader isn't setting it.

What is expected?

parser.js should be passing the file option to SourceMapGenerator, as per SourceMapGenerator docs.

Link to line in vue-loader.

What is actually happening?

parser.js skips the file property, which results in a map being exported without file specified.

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This causes an issue specifically with remap-istanbul. I thought the bug was theirs for a while but it looks like it's a saner fix in vue-loader.

[Ross-Esmond]

I added a pull for reference. #1190 It's almost a one-liner.

[yyx990803]

Thanks for the PR!