import { Metric, ReportCallback } from './base.js'; import { NavigationTimingPolyfillEntry } from './polyfills.js'; /** * A TTFB-specific version of the Metric object. */ export interface TTFBMetric extends Metric { name: 'TTFB'; entries: PerformanceNavigationTiming[] | NavigationTimingPolyfillEntry[]; } /** * An object containing potentially-helpful debugging information that * can be sent along with the TTFB value for the current page visit in order * to help identify issues happening to real-users in the field. */ export interface TTFBAttribution { /** * The total time from when the user initiates loading the page to when the * DNS lookup begins. This includes redirects, service worker startup, and * HTTP cache lookup times. */ waitingTime: number; /** * The total time to resolve the DNS for the current request. */ dnsTime: number; /** * The total time to create the connection to the requested domain. */ connectionTime: number; /** * The time time from when the request was sent until the first byte of the * response was received. This includes network time as well as server * processing time. */ requestTime: number; /** * The `PerformanceNavigationTiming` entry used to determine TTFB (or the * polyfill entry in browsers that don't support Navigation Timing). */ navigationEntry?: PerformanceNavigationTiming | NavigationTimingPolyfillEntry; } /** * A TTFB-specific version of the Metric object with attribution. */ export interface TTFBMetricWithAttribution extends TTFBMetric { attribution: TTFBAttribution; } /** * A TTFB-specific version of the ReportCallback function. */ export interface TTFBReportCallback extends ReportCallback { (metric: TTFBMetric): void; } /** * A TTFB-specific version of the ReportCallback function with attribution. */ export interface TTFBReportCallbackWithAttribution extends TTFBReportCallback { (metric: TTFBMetricWithAttribution): void; }