lighthouse 8.4.0

on Node.js NPM

Full Changelog

We expect this release to ship in the DevTools of Chrome 95, and to PageSpeed Insights within 2 weeks.

New Contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Emmanouil Zoumpoulakis @emzoumpo
Milutin Kristofic @milutin
Bjørn Erik Pedersen @bep
Jerome Cukier @jckr
Saurav Kumar @svkrclg

New Audits

• Detect when the LCP element is lazy-loaded. Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint. Learn more (#12838)

Core

• network-request: identify filesystem resources as non-network (#12970)
• viewport: add viewport audit as perf diagnostic (#12972)
• csp-evaluator: bump package version (#12990)
• config: keep full-page-screenshot in skipAudits case (#12645)
• large-javascript-libraries: delete (#12941)

⛏️👷 Fraggle Rock

Support for auditing user flows (#11313)

• collect devtoolsLogs on pageLoadError (#12980)
• add config validation (#12945)
• align navigation failure behavior (#12862)
• add protocol timeout to session (#12913)
• parity on Stacks and FullPageSnapshot gatherers (#12907)
• http-status-code: navigation only (#13005)
• add --debugNavigation setting (#12902)
• flow: sidebar mocks (#13002)
• flow: embedded lighthouse report (#12989)
• flow: summary page (#12973)
• flow: navigation sidebar (#12929)
• flow: standalone shell report with preact (#12850)

Report

• accessible n/a icon (#12984)
• split topbar features (#12926)
• prefix all classnames with lh- (#12985)
• isolate type checking (#12953, #12952, #12951)
• use postMessage to open viewer outside devtools (#12927)
• better deduping of warnings (#12355)

Deps

• snyk: update snyk snapshot (#13001, #12982)
• update to typescript 4.4.2 (#12909, #12999)

Clients

• lightrider: use iframe fetcher (#13006)
• treemap: convert to ES modules (#12892)
• viewer: make entire directory use modules (#12975)

Docs

• auth: add missing build step in README (#12911)
• changelog: fix typo in changelog.md (#12997)
• hacking: add links to buildtracker/pr-tracking (#12922)

Tests

• avoid node 16.9.0 (#13012)
• ci: restore ToT Chromium download (#12943, #12950)
• dom: fix node 16 createObjectURL bug (#12935)
• eslint: add import/order rule (#12998)
• fr: convert screenshot expectations (#12912)
• smoke: check for passing robots-txt (#13007)
• smoke: fix dbw console error expectation (#13011)
• smoke: print command to rerun failures (#12924)
• devtools: sync (#12899)
• devtools: tsc type override bug workaround (#12933)
• create faux psi report (#12815)

Misc

• the great sample rebaseline (#12932)
• restructure types to use project references (#12914, #12946, #12940)
• build: sample flow report (#12930)
• build: do not include locales in devtools bundle (#12921)
• build: remove template.html from devtools report resources (#12891)
• build: create UMD bundle build (#12898)
• build: normalize sample-report build naming (#12901)
• build: prefer paths when using gh-pages-app (#12905)
• build: refactor devtools bundle tweaking (#12974)
• tweak folder used for vercel deployment (#12879)
• cli: improve error if invalid value for --output argument is passed (#12836)
• exit collect-strings script with error code on failure (#12971)