Incubator-superset: Broken webfonts: ‘url([object Module])’ in @font-face

[Clockmaker]

Hi,
I was updating superset to 0.37 and I noticed that all the webfonts are broken

On firefox 78 there is also this warning:
Unknown descriptor ‘url([object Module])’ in @font-face rule. Skipped to next declaration.

I gave a look at the css generated by less-loader and indeed all the font-face are broken starting from 0.37 onwards.

How to reproduce the bug

bash docker run -it preset/superset:0.37 /bin/bash
inside the container:
bash grep -r "object Module" /app/superset/static/assets/ --color="auto"
I also pulled the 38da552a57b9be999fb36b2cf7ae1c9231a010eb (14 days old) with the same result.

Checklist

• [ ] I have checked the superset logs for python stacktraces and included it here as text if there are any.
• [x] I have reproduced the issue with at least the latest released version of superset.
• [x] I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

I compared webpack.config, package.json and Dockerfile with the 0.36 but I fail to see any possible breaking change.

Possible solution

I tried to add esModule: false to less-loader and it seems to solve the issue (partially, because I still have some warnings).

Thanks.

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[junlincc]

@rusackas

[rusackas]

This was resolved with #11718 and #11724