v12.6.0

Full Changelog

We expect this release to ship in the DevTools of Chrome 137, and to PageSpeed Insights within a few days.

New contributors

Thanks to our new contributors 👽🐷🐰🐯🐻!

Jack Franklin @jackfranklin
Rob Kodey @rkodey
Clément Barbaza @cba85

Notable Changes

The Performance category in the Lighthouse report now has an option to toggle "insights" - read more here.

Core

• disable invalidationTracking trace event to prevent crash (#16451)
• migrate audits from devtoolsLogs/traces to DevtoolsLog/Trace (#16448)
• modify scoreDisplayMode for insight audits to match Perf panel (#16432)
• use with import attributes for legacy-javascript, bump to node 18.20 (#16415)
• image-size-responsive: use real mimeType to exclude svg (#16443)
• insights: drop slow-css-selector-insight for now (#16457)
• insights: implement duplicated-javascript-insight (#16456)
• insights: add prominent toggle banner to report (#16461)
• insights: implement network-dependency-tree insight (#16407)
• optimized-images: ignore internal encoding errors (#16444)
• preload-fonts: add Stylesheets to required artifacts (#16421)
• stacks: correctly identify angular (#16439)
• third-party-cookies: update description (#16464)
• tracehouse: fixup parent tasks when fudging endTime (#16420)

Report

• add analytics hook for insights state (#16466)
• adjust insights notice banner, localize strings (#16463)
• add insights group description (#16455)
• associate insight audits with stack packs (#16440)
• tweak style of insight tables; use system font (#16434)
• support node inside list detail, use in insight audits (#16433)
• display insights when using toggle, even if hidden (#16431)

Deps

• upgrade trace_engine to 0.0.52 (#16465)
• upgrade trace_engine to 0.0.51 (#16447)
• upgrade deps (#16438)
• upgrade typescript to 5.8.2 (#16414)

Docs

• fix "standalone-template.html" broken link in report README (#16429)

Tests

• disable oopif-scripts smoke for devtools runner (#16446)

Misc

• prepare core/lib/legacy-javascript to be published to npm (#16416)
• treemap: represent sizes using transfer size (#16460)
• treemap: parse options properly from hash params (#16459)
• treemap: update coerceOptions to grab initialView (#16458)
• treemap: move table to right, remove Tabulator (#16428)
• treemap: set initial view mode from options (#16427)
• treemap: vary colors within bundle, update fonts (#16403)