import * as _$web_vitals0 from "web-vitals";

//#region src/instrumentations/web-vitals/WebVitalsInstrumentation/constants.d.ts
declare const EMB_WEB_VITALS_PREFIX = "emb-web-vitals";
declare const MAX_LOAF_SCRIPT_URL_LENGTH = 2048;
declare const MAX_LOAF_SCRIPT_ENTRIES = 250;
declare const CORE_WEB_VITALS: readonly ["CLS", "INP", "LCP"];
declare const ALL_WEB_VITALS: readonly ["CLS", "INP", "LCP", "FCP", "TTFB"];
declare const WEB_VITALS_ID_TO_LISTENER: {
  /**
   *  Cumulative Layout Shift (CLS)
   *  https://web.dev/articles/cls
   *
   *  Measures _unexpected_ layout shifts throughout the lifespan of a page load. User-initiated shifts, e.g. showing
   *  a loading indicator after a user clicked a button that triggered a network request, are excluded since these are
   *  expected.
   *
   *  onCLS is always called when the page's visibility state changes to hidden and may be called multiple times for
   *  a single page load.
   *
   *  SPA Note: Since this is cumulative it could be misleading in a SPA, e.g. you might cross the threshold from
   *  good -> bad on Page 3 but the largest contributor to your score might have actually occurred on Page 1
   */
  readonly CLS: (onReport: (metric: _$web_vitals0.CLSMetricWithAttribution) => void, opts?: _$web_vitals0.AttributionReportOpts) => void;
  /**
   * First Contentful Paint (FCP)
   * https://web.dev/articles/fcp
   *
   * Measures from first hard page load to when the first "content" (text, image, svg elements, etc.) is rendered
   *
   * Only measured once per page load
   */
  readonly FCP: (onReport: (metric: _$web_vitals0.FCPMetricWithAttribution) => void, opts?: _$web_vitals0.AttributionReportOpts) => void;
  /**
   * Largest Contentful Paint (LCP)
   * https://web.dev/articles/lcp
   *
   * Uses heuristics to try and measure when the "main" content has been rendered on the page. Size is a factor, but
   * certain elements that likely represent backgrounds or splash screens are excluded.
   *
   * As the page loads the element considered the largest could change, once the user interacts with the page these
   * entries stop getting reported and the metric is ready
   *
   * Only measured once per page load
   */
  readonly LCP: (onReport: (metric: _$web_vitals0.LCPMetricWithAttribution) => void, opts?: _$web_vitals0.AttributionReportOpts) => void;
  /**
   * Interaction to Next Paint (INP)
   * https://web.dev/articles/inp
   *
   * Measures how long it takes from a user interaction until the next paint. The final INP value is the longest
   * interaction observed, ignoring outliers.
   *
   * onINP is always called when the page's visibility state changes to hidden and may be called multiple times for
   * a single page load.
   *
   * Each interaction is not reported even when setting reportAllChanges=true, just when an interaction causes an
   * increase to INP.
   */
  readonly INP: (onReport: (metric: _$web_vitals0.INPMetricWithAttribution) => void, opts?: _$web_vitals0.INPAttributionReportOpts) => void;
  /**
   * Time to First Byte (TTFB)
   * https://web.dev/articles/ttfb
   *
   * Measures the time between the request for a resource and when the first byte of a response begins to arrive.
   */
  readonly TTFB: (onReport: (metric: _$web_vitals0.TTFBMetricWithAttribution) => void, opts?: _$web_vitals0.AttributionReportOpts) => void;
  readonly FID: undefined;
};
//#endregion
export { ALL_WEB_VITALS, CORE_WEB_VITALS, EMB_WEB_VITALS_PREFIX, MAX_LOAF_SCRIPT_ENTRIES, MAX_LOAF_SCRIPT_URL_LENGTH, WEB_VITALS_ID_TO_LISTENER };
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