ref(browser): Replace vendored web-vitals with web-vitals@6 dependency - #23070
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ref(browser): Replace vendored web-vitals with web-vitals@6 dependency#23070logaretm wants to merge 3 commits into
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Upstream web-vitals v6 covers the metrics we vendored, so consume it as a dependency instead of maintaining a ~1.9k-line in-tree copy. instrument.ts imports the metric functions from the package and observes performance entries with a local PerformanceObserver; the handful of generic browser helpers still needed (getNavigationEntry, getVisibilityWatcher, whenIdleOrHidden, etc.) move to metrics/web-vitals-helpers, and the rest of the vendored code is deleted. No behavior change: browser-utils unit tests and the browser-integration web-vitals suites (LCP/CLS/INP/FCP/TTFB + streamed spans) all pass.
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The vendored `observe` helper wrapped PerformanceObserver callbacks in a microtask to work around a Safari bug where the callback fires synchronously during `observe()` instead of in a separate task (GoogleChrome/web-vitals#277). The local `instrumentPerformanceObserver` dropped that defer, so paint/longtask/event/ element handlers could run synchronously at init on affected Safari versions. Upstream web-vitals@6 still ships this defer, so restore it here to match.
`instrumentInp` returns the `StopListening` cleanup from `onINP`, matching its `instrumentCls`/`instrumentLcp`/`instrumentTtfb` siblings and the `addMetricObserver` `instrumentFn` parameter, but was typed `void`. That silently discarded the cleanup so a future `stopOnCallback` on INP would no-op.
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Replaces the vendored web-vitals fork with
web-vitals@6as a dependency.No behavior change. browser-utils unit tests and the browser-integration web-vitals suites (LCP/CLS/INP/FCP/TTFB + streamed spans) pass, plus we still gate the bfcache web vitals from being sent, so identical behavior as of today.
A couple of concerns we discussed: