New Contributors!

Thanks to @peterjanes, @stevector, @AkshayIyer12, @manekinekko, @alekseykulikov, @coliff, and @emazzotta.

New Audits

• redirects: avoid page redirects (#3308)
• link-text: descriptive anchor text audit (#3490)
• is-crawlable: page is blocked from indexing (#3657)
• bootup-time: JS bootup time per script (#3563)
• uses-long-cache-ttl: detects savings from leveraging caching (#3531)
• mainthread-work-breakdown: audit for page-execution timings (#3520)

CLI

• do not double quote chromeFlags (#3775)

Core

• aspect-ratio: skip aspect ratio audit for svg (#3722)
• audit: Ignore href=javascript:.* for rel=noopener audit (#3574)
• bootup-time: refactor task/group iteration (33b1574)
• config: add silent seo audits to default config (#3582)
• config: re-weight a11y scores based on severity and frequency (#3515)
• config: add category weight to perf config (#3529)
• critical-request-chains: Remove iframe as Critical Request (#3583)
• dependency-graph: add acyclic check (#3592)
• devtools-model: fix missing Runtime.experiments object (#3514)
• driver: increase default timeout to 45s (#3741)
• driver: use execution context isolation when necessary (#3500)
• emulation: remove use of deprecated Emulation.setVisibleSize (#3536)
• errors-in-console: include runtime exceptions (#3494)
• image-aspect-ratio: pass audit when no images are missized (#3552)
• image-usage: add null check for parentElement (#3779)
• add error reporting (CLI only) (#2420)
• meta tag gatherers: meta tag search should be case-insensitive (#3729)
• predictive-perf: predict FCP (#3730)
• predictive-perf: refactor simulation logic (#3489)
• response-compression: add transferSize sanity check (#3606)
• record top-level warnings in LHR and display in report (#3692)
• remove useless optimalValue (#3774)
• speed-index: only compute perceptual speed index (#3845)
• tags blocking first-paint: exclude script type=module (#3676)

Docs

• changelog-generator: Generate changelogs (#3632)
• scoring: create documentation on scoring (#3436)
• bug-labels.md: Create bug-labels.md (#3522, #3525, #3535)
• contributing: pr title guidelines (#3590)
• correct capitalization of GitHub (#3669)
• add results object explainer (#3495)
• new-audits.md: Principles and guidance for new audits (#3617)
• readme: add MagicLight WebBLE integration (#3613)
• readme: add Treo to the list of integrations (#3484)
• throttling: because comcast throttles the websocket (bedb9a1)

Report

• Add print summary and print expanded options (#3578)
• image-aspect-ratio: fix audit description (#3843)
• redirects: reformat results, incl all requests and wasted time, (#3492)
• render-blocking-stylesheets: improve actionability of helpText (#3544)

Tests

• update eslint (and goog config) to latest (#3396)
• eslint: use --quiet flag rather than --silent (#3491)
• smokehouse: add long task to byte-efficiency tester to deflake appveyor (#3804)
• smokehouse: disable multiple shadow root deprecation test (#3695)
• smokehouse: Passive event listener violation doesn't report on passive:false now (#3498)
• web-inspector: add test for setImmediate polyfill (#3670)

Misc

• codereview: add CODEOWNERS file (#3591)
• Bump chrome-launcher to 0.8.1 (#3479)
• web-inspector: fall back to page's Runtime and queryParam() (#3497)
• use undated Apache 2 LICENSE file (#3700)
• audits: removed unused audit meta.category (#3554)
• changelog: add commitlint config (for commitlintbot) (21e25aa)
• commitizen: new-audit => new_audit (#3534)
• jsconfig: Enable type checking for JavaScript (#3589)
• logos: provide svg logo as png (8b3d7f0)
• Fix minor grammatical error (#3638)
• add cz-customizable to establish a commit message convention (#3499)
• typo: fix typo in image-aspect-ratio audit (#3513)