server.js: Enable webpack filesystem caching

[kazarmy]

As per #4446 (comment). This does seem to be an easy performance win if server.js is invoked multiple times, and it complements #4452.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.15 ⚠️

Comparison is base (f9a5b4e) 88.63% compared to head (1771f32) 88.48%.

❗ Current head 1771f32 differs from pull request most recent head a86dc16. Consider uploading reports for the commit a86dc16 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4523      +/-   ##
==========================================
- Coverage   88.63%   88.48%   -0.15%     
==========================================
  Files         293      287       -6     
  Lines       25981    25805     -176     
  Branches     6996     6944      -52     
==========================================
- Hits        23027    22834     -193     
- Misses       2748     2765      +17     
  Partials      206      206              

see 22 files with indirect coverage changes

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[canova]

Thanks for the PR! That looks pretty interesting.

I had a similar use case with Julien. I usually start it once and don't stop until I close my laptop (which is like never? :)).
But this would definitely help some people, so I think it's definitely worth landing it.

My main concern was around cache invalidation problems, but we can always revert if it becomes a real problem in the future. Chatted about this a bit on Matrix channel too, Julien was also in favor of landing it.

[kazarmy]

Chatted about this a bit on Matrix channel too, Julien was also in favor of landing it.

Yeah I noticed, thanks! :)