lighthouse 12.5.0

v12.5.0

on Node.js NPM

Full Changelog

We expect this release to ship in the DevTools of Chrome 136, and to PageSpeed Insights within 2 weeks.

Notable Changes

• legacy-javascript has been updated to target Baseline instead of esmodules for determining what code is considered "legacy" (#16366).

Core

• enable enhanced traces, pass source maps to trace engine (#16396)
• pass lantern settings to trace engine and add logging (#16377)
• adapt trace engine i18n functions to LH i18n model (#16365)
• computed-artifacts: disallow undefined properties (#16397)
• duplicated-javascript: increase threshold from 1 to 10 KiB (#16368)
• image-delivery-insight: use strings without savings (#16364)
• insights: implement use-cache-insight (#16401)
• insights: upgrade and implement forced reflow (#16395)
• insights: move to hidden group by default (#16391)
• insights: implement font display insight (#16369)
• legacy-javascript: rework/revert some unminified bundle detection (#16394)
• legacy-javascript: support rollup bundles (#16389)
• legacy-javascript: support esbuild bundles (#16385)
• legacy-javascript: support unminified code (#16384)
• legacy-javascript: improve transform detection (#16381)
• script-treemap-data: keep duplicate info when collapsing nodes (#16379)

Deps

• upgrade deps (#16408)
• upgrade trace_engine to 0.0.47 (#16376)
• upgrade trace_engine, reuse cdt bf-cache/deprecation strings (#16362)

I18n

• import (#16409)

Tests

• fix local mocha tests not properly setting isUnderTest (#16399)
• fix i18n format in Node 20.19 (#16398)
• trace-engine: fix expectations (#16380)

Misc

• move support files to core/lib/legacy-javascript (#16393)
• extract legacy javascript detection to core/lib (#16392)
• build: use current year for bundle license copyright header (#16375)
• treemap: restructure header to match new design (#16402)