wg-runtime Status Update 2020-05-11

[jridgewell]

Recap

• Justin

  • Auto link stacktrace frames to code in bug reports

  • Added support for module/nomodule script pairs

  • Fixed devAssert/userAssert for closure's type narrowing

  • Persistent browserify caching!

  • Helped remove AmpPass, various fixes to infra builds

  • Added linting to chai assertions, fixed tests

  • Added a few missing unresolved element CSS styles

  • Made blurry-image non-interactable when it's opacity: 0.

  • Fixed CEv1 in Safari 9 and Yandex

  • Made getMode().test and friends DCE in prod (again)

• Jake

  • documentHeight bugfix, unit test, and integration test.

  • amp-script worker exceptions caught as user errors instead of dev errors. 

  • Protocol Adapters unit tests and manual e2e test.

  • Small improvements to the e2e testing flow (--extensions and --fast options)

• Will

  • “intersect-resources” experiment

    • Fixed ads regression

    • Looks like 1-2% LCP, 5-6% FID improvement

  • Reviewed to-date progress on code mauve in CSI data


Learned

• Persistent module state in unit tests is tricky

• Old browsers still get a small (but noticeable) percentage in traffic

  • Does this effectively constrain our true browser support set?


Next

• Justin

  • Hoping to add persistent file transform cache to Babel

  • Deferring buildCallback (should be easier, now that I've looked into it)

    • See if any elements expect really early buildCallback

• Jake

  • New metric for in-viewport but not rendered latency

  • worker-dom Protocol Adapters PRs

  • IE11 Minimum support explorations

• Will

  • Figure out and run a manual QA plan and start prod rollout 🤞