Marc Mintel
5397309103
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75 lines
2.8 KiB
Plaintext
75 lines
2.8 KiB
Plaintext
import { Metric } from './base.js';
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/**
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* An LCP-specific version of the Metric object.
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*/
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export interface LCPMetric extends Metric {
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name: 'LCP';
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entries: LargestContentfulPaint[];
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}
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/**
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* An object containing potentially-helpful debugging information that
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* can be sent along with the LCP value for the current page visit in order
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* to help identify issues happening to real-users in the field.
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*/
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export interface LCPAttribution {
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/**
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* By default, a selector identifying the element corresponding to the
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* largest contentful paint for the page. If the `generateTarget`
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* configuration option was passed, then this will instead be the return
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* value of that function, falling back to the default if that returns null
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* or undefined.
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*/
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target?: string;
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/**
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* The URL (if applicable) of the LCP image resource. If the LCP element
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* is a text node, this value will not be set.
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*/
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url?: string;
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/**
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* The time from when the user initiates loading the page until when the
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* browser receives the first byte of the response (a.k.a. TTFB). See
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* [Optimize LCP](https://web.dev/articles/optimize-lcp) for details.
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*/
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timeToFirstByte: number;
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/**
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* The delta between TTFB and when the browser starts loading the LCP
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* resource (if there is one, otherwise 0). See [Optimize
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* LCP](https://web.dev/articles/optimize-lcp) for details.
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*/
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resourceLoadDelay: number;
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/**
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* The total time it takes to load the LCP resource itself (if there is one,
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* otherwise 0). See [Optimize LCP](https://web.dev/articles/optimize-lcp) for
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* details.
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*/
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resourceLoadDuration: number;
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/**
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* The delta between when the LCP resource finishes loading until the LCP
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* element is fully rendered. See [Optimize
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* LCP](https://web.dev/articles/optimize-lcp) for details.
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*/
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elementRenderDelay: number;
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/**
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* The `navigation` entry of the current page, which is useful for diagnosing
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* general page load issues. This can be used to access `serverTiming` for example:
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* navigationEntry?.serverTiming
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*/
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navigationEntry?: PerformanceNavigationTiming;
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/**
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* The `resource` entry for the LCP resource (if applicable), which is useful
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* for diagnosing resource load issues.
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*/
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lcpResourceEntry?: PerformanceResourceTiming;
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/**
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* The `LargestContentfulPaint` entry corresponding to LCP.
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*/
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lcpEntry?: LargestContentfulPaint;
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}
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/**
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* An LCP-specific version of the Metric object with attribution.
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*/
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export interface LCPMetricWithAttribution extends LCPMetric {
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attribution: LCPAttribution;
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}
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//# sourceMappingURL=lcp.d.ts.map
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