Fix reportAllChanges behavior for LCP when library is loaded late
#468
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Not sure what's gling on with the Firefox test. Unrelated to this PR and seems it's using v127.0a1 instead of v125.0.1 (the last successful run 2 days ago) so a dependency upgrade and seems to be ahead of stable now. Will keep digging... |
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OK I think it's just a case of Firefox Nightly being a bit broken at the mo. Will try rerunning this tomorrow. |
philipwalton
requested changes
Apr 26, 2024
philipwalton
approved these changes
Apr 29, 2024
philipwalton
changed the title
reportAllChanges behavior for LCP when library is loaded late
zemnmez-renovate-bot
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Oct 5, 2024
##### [`v4.2.3](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v423-2024-08-06) - Fix missing LoAF entries in INP attribution ([#512](GoogleChrome/web-vitals#512)) ##### [`v4.2.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v422-2024-07-17) - Fix interaction count after bfcache restore ([#505](GoogleChrome/web-vitals#505)) ##### [`v4.2.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v421-2024-06-30) - Fix compatibility issues with TypeScript v5.5 ([#497](GoogleChrome/web-vitals#497)) ##### [`v4.2.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v420-2024-06-20) - Refactor INP attribution code to fix errors on Windows 10 ([#495](GoogleChrome/web-vitals#495)) ##### [`v4.1.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v411-2024-06-10) - Fix pending LoAF cleanup logic ([#493](GoogleChrome/web-vitals#493)) ##### [`v4.1.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v410-2024-06-06) - Move the support check to the top of the onINP() function ([#490](GoogleChrome/web-vitals#490)) - Fix missing LoAF attribution when entries are dispatched before event entries ([#487](GoogleChrome/web-vitals#487)) ##### [`v4.0.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v401-2024-05-21) - Add the `ReportCallback` type back but deprecate it ([#483](GoogleChrome/web-vitals#483)) ##### [`v4.0.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v400-2024-05-13) - **\[BREAKING]** Update types to support more generic usage ([#471](GoogleChrome/web-vitals#471)) - **\[BREAKING]** Split `waitingDuration` to make it easier to understand redirect delays ([#458](GoogleChrome/web-vitals#458)) - **\[BREAKING]** Rename `TTFBAttribution` fields from `*Time` to `*Duration` ([#453](GoogleChrome/web-vitals#453)) - **\[BREAKING]** Rename `resourceLoadTime` to `resourceLoadDuration` in LCP attribution ([#450](GoogleChrome/web-vitals#450)) - **\[BREAKING]** Add INP breakdown timings and LoAF attribution ([#442](GoogleChrome/web-vitals#442)) - **\[BREAKING]** Deprecate `onFID()` and remove previously deprecated APIs ([#435](GoogleChrome/web-vitals#435)) - Expose the target element in INP attribution ([#479](GoogleChrome/web-vitals#479)) - Save INP target after interactions to reduce null values when removed from the DOM ([#477](GoogleChrome/web-vitals#477)) - Cap TTFB in attribution ([#440](GoogleChrome/web-vitals#440)) - Fix `reportAllChanges` behavior for LCP when library is loaded late ([#468](GoogleChrome/web-vitals#468)) ##### [`v3.5.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v352-2024-01-25) - Pick the first non-null `target` for INP attribution ([#421](GoogleChrome/web-vitals#421)) ##### [`v3.5.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v351-2023-12-27) - Add extra guard for `PerformanceEventTiming` not existing ([#403](GoogleChrome/web-vitals#403)) ##### [`v3.5.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v350-2023-09-28) - Run `onLCP` callback in separate task ([#386](GoogleChrome/web-vitals#386)) - Fix INP durationThreshold bug when set to 0 ([#372](GoogleChrome/web-vitals#372)) - Prevent FID entries being emitted as INP for non-supporting browsers ([#368](GoogleChrome/web-vitals#368)) ##### [`v3.4.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v340-2023-07-11) - Make `bindReporter` generic over metric type ([#359](GoogleChrome/web-vitals#359)) - Update INP status in README ([#362](GoogleChrome/web-vitals#362)) - Fix Metric types for better TypeScript support ([#356](GoogleChrome/web-vitals#356)) - Fix selector for SVGs for attribution build ([#354](GoogleChrome/web-vitals#354)) ##### [`v3.3.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v332-2023-05-29) - Fix attribution types ([#348](GoogleChrome/web-vitals#348)) - Safe access navigation entry type ([#290](GoogleChrome/web-vitals#290)) ##### [`v3.3.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v331-2023-04-04) - Export metric rating thresholds in attribution build as well. ##### [`v3.3.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v330-2023-03-09) - Export metric rating thresholds, add explicit `MetricRatingThresholds` type ([#323](GoogleChrome/web-vitals#323)) - Trim classname selector ([#328](GoogleChrome/web-vitals#328)) - Add link to CrUX versus RUM blog post ([#327](GoogleChrome/web-vitals#327)) - Prevent LCP being reported for hidden prerendered pages ([#326](GoogleChrome/web-vitals#326)) - Add Server Timing information to docs ([#324](GoogleChrome/web-vitals#324)) - Fix link in `onINP()` thresholds comment ([#318](GoogleChrome/web-vitals#318)) - Update web.dev link for `onINP()` ([#307](GoogleChrome/web-vitals#307)) - Add a note about when to load the library ([#305](GoogleChrome/web-vitals#305)) ##### [`v3.1.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v311-2023-01-10) - Defer CLS logic until after `onFCP()` callback ([#297](GoogleChrome/web-vitals#297)) ##### [`v3.1.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v310-2022-11-15) - Add support for `'restore'` as a `navigationType` ([#284](GoogleChrome/web-vitals#284)) - Report initial CLS value when `reportAllChanges` is true ([#283](GoogleChrome/web-vitals#283)) - Defer all observers until after activation ([#282](GoogleChrome/web-vitals#282)) - Ignore TTFB for loads where responseStart is zero ([#281](GoogleChrome/web-vitals#281)) - Defer execution of observer callbacks ([#278](GoogleChrome/web-vitals#278)) ##### [`v3.0.4](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v304-2022-10-18) - Clamp LCP and FCP to 0 for prerendered pages ([#270](GoogleChrome/web-vitals#270)) ##### [`v3.0.3](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v303-2022-10-04) - Ensure `attribution` object is always present in attribution build ([#265](GoogleChrome/web-vitals#265)) ##### [`v3.0.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v302-2022-09-14) - Set an explicit unpkg dist file ([#261](GoogleChrome/web-vitals#261)) ##### [`v3.0.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v301-2022-08-31) - Use the cjs extension for all UMD builds ([#257](GoogleChrome/web-vitals#257)) ##### [`v3.0.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v300-2022-08-24) - **\[BREAKING]** Add a config object param to all metric functions ([#225](GoogleChrome/web-vitals#225)) - **\[BREAKING]** Report TTFB after a bfcache restore ([#220](GoogleChrome/web-vitals#220)) - **\[BREAKING]** Only include last LCP entry in metric entries ([#218](GoogleChrome/web-vitals#218)) - Update the metric ID prefix for v3 ([#251](GoogleChrome/web-vitals#251)) - Move the Navigation Timing API polyfill to the base+polyfill build ([#248](GoogleChrome/web-vitals#248)) - Add a metric rating property ([#246](GoogleChrome/web-vitals#246)) - Add deprecation notices for base+polyfill builds ([#242](GoogleChrome/web-vitals#242)) - Add a new attribution build for debugging issues in the field ([#237](GoogleChrome/web-vitals#237), [#244](GoogleChrome/web-vitals#244)) - Add support for prerendered pages ([#233](GoogleChrome/web-vitals#233)) - Rename the `ReportHandler` type to `ReportCallback`, with alias for back-compat ([#225](GoogleChrome/web-vitals#225), [#227](GoogleChrome/web-vitals#227)) - Add support for the new INP metric ([#221](GoogleChrome/web-vitals#221), [#232](GoogleChrome/web-vitals#232)) - Rename `getXXX()` functions to `onXXX()` ([#222](GoogleChrome/web-vitals#222)) - Add a `navigationType` property to the Metric object ([#219](GoogleChrome/web-vitals#219))
github-merge-queue bot
pushed a commit
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that referenced
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Oct 5, 2024
##### [`v4.2.3](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v423-2024-08-06) - Fix missing LoAF entries in INP attribution ([#512](GoogleChrome/web-vitals#512)) ##### [`v4.2.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v422-2024-07-17) - Fix interaction count after bfcache restore ([#505](GoogleChrome/web-vitals#505)) ##### [`v4.2.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v421-2024-06-30) - Fix compatibility issues with TypeScript v5.5 ([#497](GoogleChrome/web-vitals#497)) ##### [`v4.2.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v420-2024-06-20) - Refactor INP attribution code to fix errors on Windows 10 ([#495](GoogleChrome/web-vitals#495)) ##### [`v4.1.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v411-2024-06-10) - Fix pending LoAF cleanup logic ([#493](GoogleChrome/web-vitals#493)) ##### [`v4.1.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v410-2024-06-06) - Move the support check to the top of the onINP() function ([#490](GoogleChrome/web-vitals#490)) - Fix missing LoAF attribution when entries are dispatched before event entries ([#487](GoogleChrome/web-vitals#487)) ##### [`v4.0.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v401-2024-05-21) - Add the `ReportCallback` type back but deprecate it ([#483](GoogleChrome/web-vitals#483)) ##### [`v4.0.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v400-2024-05-13) - **\[BREAKING]** Update types to support more generic usage ([#471](GoogleChrome/web-vitals#471)) - **\[BREAKING]** Split `waitingDuration` to make it easier to understand redirect delays ([#458](GoogleChrome/web-vitals#458)) - **\[BREAKING]** Rename `TTFBAttribution` fields from `*Time` to `*Duration` ([#453](GoogleChrome/web-vitals#453)) - **\[BREAKING]** Rename `resourceLoadTime` to `resourceLoadDuration` in LCP attribution ([#450](GoogleChrome/web-vitals#450)) - **\[BREAKING]** Add INP breakdown timings and LoAF attribution ([#442](GoogleChrome/web-vitals#442)) - **\[BREAKING]** Deprecate `onFID()` and remove previously deprecated APIs ([#435](GoogleChrome/web-vitals#435)) - Expose the target element in INP attribution ([#479](GoogleChrome/web-vitals#479)) - Save INP target after interactions to reduce null values when removed from the DOM ([#477](GoogleChrome/web-vitals#477)) - Cap TTFB in attribution ([#440](GoogleChrome/web-vitals#440)) - Fix `reportAllChanges` behavior for LCP when library is loaded late ([#468](GoogleChrome/web-vitals#468)) ##### [`v3.5.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v352-2024-01-25) - Pick the first non-null `target` for INP attribution ([#421](GoogleChrome/web-vitals#421)) ##### [`v3.5.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v351-2023-12-27) - Add extra guard for `PerformanceEventTiming` not existing ([#403](GoogleChrome/web-vitals#403)) ##### [`v3.5.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v350-2023-09-28) - Run `onLCP` callback in separate task ([#386](GoogleChrome/web-vitals#386)) - Fix INP durationThreshold bug when set to 0 ([#372](GoogleChrome/web-vitals#372)) - Prevent FID entries being emitted as INP for non-supporting browsers ([#368](GoogleChrome/web-vitals#368)) ##### [`v3.4.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v340-2023-07-11) - Make `bindReporter` generic over metric type ([#359](GoogleChrome/web-vitals#359)) - Update INP status in README ([#362](GoogleChrome/web-vitals#362)) - Fix Metric types for better TypeScript support ([#356](GoogleChrome/web-vitals#356)) - Fix selector for SVGs for attribution build ([#354](GoogleChrome/web-vitals#354)) ##### [`v3.3.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v332-2023-05-29) - Fix attribution types ([#348](GoogleChrome/web-vitals#348)) - Safe access navigation entry type ([#290](GoogleChrome/web-vitals#290)) ##### [`v3.3.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v331-2023-04-04) - Export metric rating thresholds in attribution build as well. ##### [`v3.3.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v330-2023-03-09) - Export metric rating thresholds, add explicit `MetricRatingThresholds` type ([#323](GoogleChrome/web-vitals#323)) - Trim classname selector ([#328](GoogleChrome/web-vitals#328)) - Add link to CrUX versus RUM blog post ([#327](GoogleChrome/web-vitals#327)) - Prevent LCP being reported for hidden prerendered pages ([#326](GoogleChrome/web-vitals#326)) - Add Server Timing information to docs ([#324](GoogleChrome/web-vitals#324)) - Fix link in `onINP()` thresholds comment ([#318](GoogleChrome/web-vitals#318)) - Update web.dev link for `onINP()` ([#307](GoogleChrome/web-vitals#307)) - Add a note about when to load the library ([#305](GoogleChrome/web-vitals#305)) ##### [`v3.1.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v311-2023-01-10) - Defer CLS logic until after `onFCP()` callback ([#297](GoogleChrome/web-vitals#297)) ##### [`v3.1.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v310-2022-11-15) - Add support for `'restore'` as a `navigationType` ([#284](GoogleChrome/web-vitals#284)) - Report initial CLS value when `reportAllChanges` is true ([#283](GoogleChrome/web-vitals#283)) - Defer all observers until after activation ([#282](GoogleChrome/web-vitals#282)) - Ignore TTFB for loads where responseStart is zero ([#281](GoogleChrome/web-vitals#281)) - Defer execution of observer callbacks ([#278](GoogleChrome/web-vitals#278)) ##### [`v3.0.4](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v304-2022-10-18) - Clamp LCP and FCP to 0 for prerendered pages ([#270](GoogleChrome/web-vitals#270)) ##### [`v3.0.3](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v303-2022-10-04) - Ensure `attribution` object is always present in attribution build ([#265](GoogleChrome/web-vitals#265)) ##### [`v3.0.2](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v302-2022-09-14) - Set an explicit unpkg dist file ([#261](GoogleChrome/web-vitals#261)) ##### [`v3.0.1](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v301-2022-08-31) - Use the cjs extension for all UMD builds ([#257](GoogleChrome/web-vitals#257)) ##### [`v3.0.0](https://github.com/GoogleChrome/web-vitals/blob/HEAD/CHANGELOG.md#v300-2022-08-24) - **\[BREAKING]** Add a config object param to all metric functions ([#225](GoogleChrome/web-vitals#225)) - **\[BREAKING]** Report TTFB after a bfcache restore ([#220](GoogleChrome/web-vitals#220)) - **\[BREAKING]** Only include last LCP entry in metric entries ([#218](GoogleChrome/web-vitals#218)) - Update the metric ID prefix for v3 ([#251](GoogleChrome/web-vitals#251)) - Move the Navigation Timing API polyfill to the base+polyfill build ([#248](GoogleChrome/web-vitals#248)) - Add a metric rating property ([#246](GoogleChrome/web-vitals#246)) - Add deprecation notices for base+polyfill builds ([#242](GoogleChrome/web-vitals#242)) - Add a new attribution build for debugging issues in the field ([#237](GoogleChrome/web-vitals#237), [#244](GoogleChrome/web-vitals#244)) - Add support for prerendered pages ([#233](GoogleChrome/web-vitals#233)) - Rename the `ReportHandler` type to `ReportCallback`, with alias for back-compat ([#225](GoogleChrome/web-vitals#225), [#227](GoogleChrome/web-vitals#227)) - Add support for the new INP metric ([#221](GoogleChrome/web-vitals#221), [#232](GoogleChrome/web-vitals#232)) - Rename `getXXX()` functions to `onXXX()` ([#222](GoogleChrome/web-vitals#222)) - Add a `navigationType` property to the Metric object ([#219](GoogleChrome/web-vitals#219))
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Currently if
reportAllChanges=truebut web-vitals is loaded late, then it doesn't report all LCP changes as we take the last one.This can be confusing and make you think only one LCP entry was emitted when multiple ones were. It can be useful to know that multiple entries are emitted and this works for all the other metrics.
I also removed some "// Greater than the image load delay." comments that weren't true.