Marc Mintel
5397309103
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60 lines
2.3 KiB
Plaintext
60 lines
2.3 KiB
Plaintext
import type { Metric } from './base';
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/**
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* A TTFB-specific version of the Metric object.
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*/
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export interface TTFBMetric extends Metric {
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name: 'TTFB';
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entries: PerformanceNavigationTiming[];
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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 TTFB 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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* NOTE: these values are primarily useful for page loads not handled via
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* service worker, as browsers differ in what they report when service worker
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* is involved, see: https://github.com/w3c/navigation-timing/issues/199
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*/
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export interface TTFBAttribution {
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/**
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* The total time from when the user initiates loading the page to when the
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* page starts to handle the request. Large values here are typically due
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* to HTTP redirects, though other browser processing contributes to this
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* duration as well (so even without redirect it's generally not zero).
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*/
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waitingDuration: number;
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/**
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* The total time spent checking the HTTP cache for a match. For navigations
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* handled via service worker, this duration usually includes service worker
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* start-up time as well as time processing `fetch` event listeners, with
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* some exceptions, see: https://github.com/w3c/navigation-timing/issues/199
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*/
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cacheDuration: number;
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/**
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* The total time to resolve the DNS for the requested domain.
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*/
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dnsDuration: number;
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/**
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* The total time to create the connection to the requested domain.
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*/
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connectionDuration: number;
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/**
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* The total time from when the request was sent until the first byte of the
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* response was received. This includes network time as well as server
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* processing time.
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*/
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requestDuration: 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
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* example: navigationEntry?.serverTiming
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*/
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navigationEntry?: PerformanceNavigationTiming;
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}
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/**
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* A TTFB-specific version of the Metric object with attribution.
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*/
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export interface TTFBMetricWithAttribution extends TTFBMetric {
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attribution: TTFBAttribution;
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}
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//# sourceMappingURL=ttfb.d.ts.map |