web-vitals

• Scope the navigation interaction count to each InteractionManager (#783)

• Add Resource Timing buffer for LCP attribution (#776)

• Prevent JavaScript error if PerformanceObserver not available (#772)

v6 introduces Soft Navigation support for the Web Vitals metrics when supported by the browser.

[!NOTE] See the upgrading to v6 guide for a complete list of all API changes in version 6.

• [BREAKING] Remove unneeded modules with tsconfig verbatimModuleSyntax (#741)
• Add source maps (#771)
• Cap RequestIdleCallback to 1 second to ensure metrics report even when busy (#755)
• Flip default for includeProcessedEventEntries to false for v6 (#763)
• Add Soft Navigation support (#308)
• Add bfcache support for reporting small INP interactions (part of #308)

• Remove getFirstHiddenTimePolyfill (#729)
• Fixed issue where the same configuration object to multiple metric functions can result in errors (#731)
• Add more robust interactionTarget setting for INP (#744)

• Replace filter()[0] with find() for better performance (#658)
• Use queueMicrotask for microtask scheduling (#660)
• Simplify the event and LoAF entry clean up logic (#662)
• Remove obsolete FID polyfill types (#675)
• Use LargestContentfulPaint.id as fallback when element is removed from DOM (#676)
• Fix bug for onLCP when attached late (#697)
• FHandle initially hidden pages and onLCP registered on visibility change (#698)
• Ensure we clear idle callbacks in whenIdleOrHidden (#707)
• Limit pending events to conserve memory (#710)
• Add includeProcessedEventEntries option (#714)
• Reduce bundle size by refactoring (#713)

• Register visibility-change early (#637)
• Only finalize LCP on user events (isTrusted=true) (#635)
• Fallback to default getSelector if custom function is null or undefined (#634)

• Remove visibilitychange event listeners when no longer required (#627)

• Handle layout shifts with no sources (#623)

• Fix missing FCP and LCP for prerendered pages (#621)

[!NOTE] See the upgrading to v5 guide for a complete list of all API changes in version 5.

• [BREAKING] Remove the deprecated onFID() function (#519)
• [BREAKING] Change browser support policy to Baseline Widely available (#525)
• [BREAKING] Sort the classes that appear in attribution selectors to reduce cardinality (#518)
• Extend INP attribution with extra LoAF information: longest script and buckets (#592)
• Add support for generating custom targets in the attribution build (#585)
• Support multiple calls to onINP() with different config options (#583)
• Use visibility-state performance entries (#612)
• Ensure idle callbacks don't run twice (#541) and (#548)
• Cap nextPaintTime at processingStart (#540) and (#546)
• Cap INP breakdowns to INP duration (#528)
• Cap LCP load duration to LCP time (#527)

• Fix memory leak in registering new event listeners on every keydown and click (#554)

• Fix missing LoAF entries in INP attribution (#512)

• Fix interaction count after bfcache restore (#505)

• Fix compatibility issues with TypeScript v5.5 (#497)

• Refactor INP attribution code to fix errors on Windows 10 (#495)

• Fix pending LoAF cleanup logic (#493)

• Move the support check to the top of the onINP() function (#490)
• Fix missing LoAF attribution when entries are dispatched before event entries (#487)

• Add the ReportCallback type back but deprecate it (#483)

[!NOTE] See the upgrading to v4 guide for a complete list of all API changes in version 4.

• [BREAKING] Update types to support more generic usage (#471)
• [BREAKING] Split waitingDuration to make it easier to understand redirect delays (#458)
• [BREAKING] Rename TTFBAttribution fields from *Time to *Duration (#453)
• [BREAKING] Rename resourceLoadTime to resourceLoadDuration in LCP attribution (#450)
• [BREAKING] Add INP breakdown timings and LoAF attribution (#442)
• [BREAKING] Deprecate onFID() and remove previously deprecated APIs (#435)
• Expose the target element in INP attribution (#479)
• Save INP target after interactions to reduce null values when removed from the DOM (#477)
• Cap TTFB in attribution (#440)
• Fix reportAllChanges behavior for LCP when library is loaded late (#468)

• Pick the first non-null target for INP attribution (#421)

• Add extra guard for PerformanceEventTiming not existing (#403)

• Run onLCP callback in separate task (#386)
• Fix INP durationThreshold bug when set to 0 (#372)
• Prevent FID entries being emitted as INP for non-supporting browsers (#368)