v12.1.0

Thanks to our new contributors 👽🐷🐰🐯🐻!

• Hamir Mahal @hamirmahal
• angad-sethi @angad-sethi
• Junaid Ramzan @ajuni880

Notable Changes

• remove first-meaningful-paint metric (#16047)

Core

• move simulator creation and network analysis to lib/lantern (#16003)
• handle target crash at any point (#15985)
• aria-allowed-role: fix title and description (#16042)
• inspector-issues: add shared dictionary issue (#15993)
• lantern: refactor to DevTools modules convention (#16071)
• lantern: rename files to PascalCase (#16068)
• lantern: remove last usages of Lighthouse NetworkRequest (#16067)
• lantern: remove usage of Lighthouse constants module (#16062)
• lantern: remove all LH types (#16061)
• lantern: move tbt-util.js to lib/lantern (#16058)
• lantern: separate TraceEngine specific code (#16051)
• lantern: extract main thread events w/o TraceProcessor (#16049)
• lantern: remove usage of Lighthouse's ProcessedNavigation (#16048)
• lantern: use LCP instead of FMP for TTI simulation bounds (#16046)
• lantern: use computed artifact to create graph using trace (#16040)
• lantern: rename NetworkRequest record to rawRequest (#16037)
• lantern: resolve some differences when using trace (#16033)
• lantern: create network graph from trace (experimental) (#16026)
• network: align headers end time with send when no data received (#16044)
• network: fix time units in network quiet calc (#16013)
• test: add generatable squoosh trace (#15997)
• test: add generatable trace for paint metrics (#15994)
• test: add generatable iframe trace (#15995)
• types: add missing fields to Result.Category and NodeDetails (#16006)

CLI

• stop treating chrome launcher kill() as async (#15998)

Deps

• upgrade puppeteer to 22.11.1 (#16070)
• upgrade chrome-launcher to 1.1.2 (#16069)
• upgrade puppeteer to 22.10.0 (#16054)
• upgrade third-party-web to 0.24.3 (#16055)
• upgrade axe-core to 4.9.1 (#16056)

I18n

• import (#16080)

Docs

• remove await from chrome.kill() (#15982)

Tests

• use newer traces in network-analyzer-test.js (#16043)
• default to 0 for network trace data length (#16041)
• update remaining old traces for Lantern (#16039)
• use new trace in metrics-test for pwa (#16025)
• update many test traces, support .json.gz (#16007)
• add timeout to runSmokeTest (#16017)
• fix devtools e2e test runner (#16018)
• reduce expected value of render-blocking-requests smoke (#16011)
• update interactive test trace (#16001)
• use new button class name for devtools run script (#15999)
• ci: remove reference to deleted smoke test (#16010)
• lantern: fix some tests not running (#16073)
• lantern: refactor to DevTools test convention (#16072)
• lantern: remove usage of devtoolsLog in simulator tests (#16065)
• lantern: remove usage of computed SpeedIndex (#16064)
• lantern: remove usage of computed PageDependencyGraph (#16063)
• lantern: use TraceEngine directly in test fixtures (#16057)
• lantern: remove Speedline from Lantern unit test for now (#16060)
• lantern: remove devtools log from tests (#16050)

Misc

• change connectionId from string to number (#15983)
• ci: fix deprecated node usage in checkout@v3 (#16022)
• strings: fix WebAuthetication typo (#16028)