Nyc with multiple file extensions option generates no coverage

[Songworks]

I've got a project with a mix of .jsx and .js files and have been using nyc by calling nyc -e .jsx _mocha, all working well enough so far.

Now however I tried to use this good plugin to get better branch coverage on the .jsx files. I've setup my project based on the plugins readme and when I call NODE_ENV=test nyc -e .jsx _mocha, the mocha tests run through fine but I get no coverage at all (or at least it just outputs All files|UNKNOWN|UNKNOWN|UKNOWN|UNKNOWN in the terminal).

Here's an interesting part: If I remove the nyc argument -e .jsx I do get coverage, but only for .jsx files. With that information, I've also tried to add a include option to nyc with src/**/*.@(jsx|js) (thinking the plugin might disregard .js files by default) but still only got coverage for .jsx file.

Any idea what I'm doing wrong or how I get the plugin and nyc together to instrument/cover both file extensions?

Possibly relevant information:

Versions: node: 8.9.4 babel-core: 6.26.0 babel-plugin-istanbul: 4.1.5 nyc: 11.4.1

Babel presets: env, stage-2, react No further nyc configuration beyond what's required from your readme and the -e argument.

Any other information required?

Thanks in advance!