@embrace-io/web-sdk
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JavaScript
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
let web_vitals_attribution = require("web-vitals/attribution");
//#region src/instrumentations/web-vitals/WebVitalsInstrumentation/constants.ts
const WEB_VITAL_EVENT_NAME = "browser.web_vital";
const MAX_LOAF_SCRIPT_URL_LENGTH = 2048;
const MAX_LOAF_SCRIPT_ENTRIES = 250;
const MAX_CLS_LAYOUT_SHIFTS = 50;
const ALL_WEB_VITALS = [
"CLS",
"INP",
"LCP",
"FCP",
"TTFB"
];
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
*/
CLS: web_vitals_attribution.onCLS,
/**
* 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
*/
FCP: web_vitals_attribution.onFCP,
/**
* 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
*/
LCP: web_vitals_attribution.onLCP,
/**
* 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.
*/
INP: web_vitals_attribution.onINP,
/**
* 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.
*/
TTFB: web_vitals_attribution.onTTFB,
FID: void 0
};
//#endregion
exports.ALL_WEB_VITALS = ALL_WEB_VITALS;
exports.MAX_CLS_LAYOUT_SHIFTS = MAX_CLS_LAYOUT_SHIFTS;
exports.MAX_LOAF_SCRIPT_ENTRIES = MAX_LOAF_SCRIPT_ENTRIES;
exports.MAX_LOAF_SCRIPT_URL_LENGTH = MAX_LOAF_SCRIPT_URL_LENGTH;
exports.WEB_VITALS_ID_TO_LISTENER = WEB_VITALS_ID_TO_LISTENER;
exports.WEB_VITAL_EVENT_NAME = WEB_VITAL_EVENT_NAME;
//# sourceMappingURL=constants.cjs.map