feat(build): webpack visualizer

[rusackas]

SUMMARY

Some updates to the bundle analyzer in honor of @kgabryje's recent efforts. This PR does several things:

• Adds a new npm run bundle-stats script to run package bundle analysis
• Makes webpack's production build process (a.k.a. npm run build) exits when complete.
• Removes the earlier webpack-bundle-analyzer flag in favor of the new npm script
• Sets webpack-bundle-analyzer to static mode rather than server mode.
• Adds a new bundle analyzer with a sunburst chart, which makes some aspects easier
• Has BOTH bundle analyzers open at the end of the build process in your browser.

Here's what the new bundle analyzer looks like:

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[kgabryje]

Nice! I wonder if we should run the plugin only if a flag is passed, like we do with bundle analyzer

[rusackas]

@kgabryje check out the updated PR description, it all works pretty smoothly now.

[kgabryje]

LGTM!

[michael-s-molina]

Given that we removed --analyzeBundle parameter, should we add something to UPDATING.md?

[rusackas]

Given that we removed --analyzeBundle parameter, should we add something to UPDATING.md?

Happy to if you want. I only skipped it since neither Kamil nor I could get the --analyzeBundle parameter to actually WORK. We both just tweak the code to run the analyzer, it turns out. I figured this basically takes a broken tool and makes it work, and it's a dev tool rather than user-facing, so I wasn't sure how much value there is.

What might cover this would actually be a Wiki page explaining what all our scripts do, since there are a TON of them, and there's not really any real documentation on the whole lot.