WIP: drop parallel-webpack in favor of using webpack directly

[floryst]

Goal: speed up examples building

Could revisit this with vite instead (but would need to work with #3255)

Things that need to be addressed:

• npm run example runner
• markdown/documentation site entry generation

[daker]

I think it’d be great if we switched to Vite and phased out the UMD build.

[floryst]

Agreed. I'm mostly pushing this for reference, but vite would be the way to go down the road.

[daker]

not related to this PR but to webpack when trying to run the examples

Browserslist: browsers data (caniuse-lite) is 7 months old. Please run:
  npx update-browserslist-db@latest
  Why you should do it regularly: https://github.com/browserslist/update-db#readme
[webpack-cli] Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
 - options has an unknown property '_assetEmittingPreviousFiles'. These properties are valid:
   object { allowedHosts?, bonjour?, client?, compress?, devMiddleware?, headers?, historyApiFallback?, host?, hot?, ipc?, liveReload?, onListening?, open?, port?, proxy?, server?, app?, setupExitSignals?, setupMiddlewares?, static?, watchFiles?, webSocketServer? } 

[daker]

it's related to this commit: 3953b55#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519R125-R128

i switched back to webpack-dev-server: 4.9.0

[jourdain]

@sankhesh