[BUILD TOOLS]: Replace Bundlesize

[markwhitfeld]

Description

Bundlesize has issues comparing PR bundle sizes to master.
Updating the bundlesize manually in PRs is a real pain, and it doesn't give a comparison to master (because of issue siddharthkp/bundlesize#308). There must be something better!
We are probably also abusing the maxSize threshold prop by keeping it so close to the actual size and updating it all the time.

We need to investigate alternatives!

Some thoughts:

• It would be nice to commit the actual sizes to keep a history
• We really need to be able to compare a PR to master to see the change in size
• It should not interfere with PRs so much, the check and comparison is important, but fiddling values all the time is tedious
• It would be great if there was some easier way to automate the bundle size commits in PRs (potentially a commit from CI - although we would not want this to be recursive!)

We really need 2 different things...

• Report the size difference to master from a PR
• Commit a list of the current bundle sizes so that we can have a history
  Maybe these could come from different tools

[markwhitfeld]

This might be an easy drop-in replacement:
https://bundlewatch.io/#/getting-started/using-bundlewatch
I think it is a fork of the other project

Bundlewatch has an action too
https://github.com/jackyef/bundlewatch-gh-action

We could use something like this to push updates back to the PR... as long as we have a way to save or retrieve the bundle sizes as a json file. I think that we could use one of the internal bundlesize apis to fetch the file details (https://github.com/bundlewatch/bundlewatch/blob/98b7b789d40032b301351d2c0b02a1c443db2b7a/src/app/reporting/BundleWatchService/index.js#L40)
https://github.com/marketplace/actions/git-auto-commit

[markwhitfeld]

Could be useful:
https://brennerm.github.io/posts/trigger-github-actions-on-pr-close.html

[markwhitfeld]

@splincode This looks like a great alternative that was released recently:
https://github.com/LironEr/bundlemon

[splincode]

@markwhitfeld it's really interesting! what about add github action?
https://github.com/LironEr/bundlemon-github-actions

[markwhitfeld]

@splincode Yeah, it looks like great integration!

[arturovt]

@rfprod since you’re a pro at GitHub actions, would you want to take this one also?

[rfprod]

@arturovt @markwhitfeld
I have a question. Do you think it will be possible to contribute to the project via the fork strategy if bumdlemon is used with all possible features instead of bumdlesize?
In particular if GH app will be ebabled https://github.com/LironEr/bundlemon-github-actions#create-bundlemon-project?
Forkes will not have environment variables.

PS:
Or bundlemon jobs can be disabled in forks just as publish jobs.

[rfprod]

@arturovt Yes, I can take this one, but most likely it will require collaboration in terms of creating a bundlemon project and adding secrets to the repo.