web-vitals/dist/web-vitals.iife.js

Easily measure performance metrics in JavaScript

var webVitals=function(e){"use strict";let t=-1;const n=e=>{addEventListener("pageshow",n=>{n.persisted&&(t=n.timeStamp,e(n))},!0)},i=(e,t,n,i)=>{let s,o;return r=>{t.value>=0&&(r||i)&&(o=t.value-(s??0),(o||void 0===s)&&(s=t.value,t.delta=o,t.rating=((e,t)=>e>t[1]?"poor":e>t[0]?"needs-improvement":"good")(t.value,n),e(t)))}},s=e=>{requestAnimationFrame(()=>requestAnimationFrame(e))},o=()=>{const e=performance.getEntriesByType("navigation")[0];if(e&&e.responseStart>0&&e.responseStart<performance.now())return e},r=()=>o()?.activationStart??0,c=(e,n=-1)=>{const i=o();let s="navigate";t>=0?s="back-forward-cache":i&&(document.prerendering||r()>0?s="prerender":document.wasDiscarded?s="restore":i.type&&(s=i.type.replace(/_/g,"-")));return{name:e,value:n,rating:"good",delta:0,entries:[],id:`v5-${Date.now()}-${Math.floor(8999999999999*Math.random())+1e12}`,navigationType:s}},a=new WeakMap;function d(e,t){let n=a.get(t);return n||(n=new WeakMap,a.set(t,n)),n.get(e)||n.set(e,new t),n.get(e)}class h{t;i=0;o=[];h(e){if(e.hadRecentInput)return;const t=this.o[0],n=this.o.at(-1);this.i&&t&&n&&e.startTime-n.startTime<1e3&&e.startTime-t.startTime<5e3?(this.i+=e.value,this.o.push(e)):(this.i=e.value,this.o=[e]),this.t?.(e)}}const f=(e,t,n={})=>{try{if(PerformanceObserver.supportedEntryTypes.includes(e)){const i=new PerformanceObserver(e=>{queueMicrotask(()=>{t(e.getEntries())})});return i.observe({type:e,buffered:!0,...n}),i}}catch{}},l=e=>{let t=!1;return()=>{t||(e(),t=!0)}};let u=-1;const m=new Set,g=()=>"hidden"!==document.visibilityState||document.prerendering?1/0:0,p=e=>{if("hidden"===document.visibilityState){if("visibilitychange"===e.type)for(const e of m)e();isFinite(u)||(u="visibilitychange"===e.type?e.timeStamp:0,removeEventListener("prerenderingchange",p,!0))}},v=()=>{if(u<0){const e=r(),t=document.prerendering?void 0:globalThis.performance.getEntriesByType("visibility-state").find(t=>"hidden"===t.name&&t.startTime>=e)?.startTime;u=t??g(),addEventListener("visibilitychange",p,!0),addEventListener("prerenderingchange",p,!0),n(()=>{setTimeout(()=>{u=g()})})}return{get firstHiddenTime(){return u},onHidden(e){m.add(e)}}},y=e=>{document.prerendering?addEventListener("prerenderingchange",e,!0):e()},T=[1800,3e3],b=(e,t={})=>{y(()=>{const o=v();let a,d=c("FCP");const h=f("paint",e=>{for(const t of e)"first-contentful-paint"===t.name&&(h.disconnect(),t.startTime<o.firstHiddenTime&&(d.value=Math.max(t.startTime-r(),0),d.entries.push(t),a(!0)))});h&&(a=i(e,d,T,t.reportAllChanges),n(n=>{d=c("FCP"),a=i(e,d,T,t.reportAllChanges),s(()=>{d.value=performance.now()-n.timeStamp,a(!0)})}))})},E=[.1,.25];let L=0,P=1/0,_=0;const M=e=>{for(const t of e)t.interactionId&&(P=Math.min(P,t.interactionId),_=Math.max(_,t.interactionId),L=_?(_-P)/7+1:0)};let w;const C=()=>w?L:performance.interactionCount??0,I=()=>{"interactionCount"in performance||w||(w=f("event",M,{durationThreshold:0}))};let F=0;class k{l=[];u=new Map;m;p;v(){F=C(),this.l.length=0,this.u.clear()}T(){const e=Math.min(this.l.length-1,Math.floor((C()-F)/50));return this.l[e]}h(e){if(this.m?.(e),!e.interactionId&&"first-input"!==e.entryType)return;const t=this.l.at(-1);let n=this.u.get(e.interactionId);if(n||this.l.length<10||e.duration>t.L){if(n?e.duration>n.L?(n.entries=[e],n.L=e.duration):e.duration===n.L&&e.startTime===n.entries[0].startTime&&n.entries.push(e):(n={id:e.interactionId,entries:[e],L:e.duration},this.u.set(n.id,n),this.l.push(n)),this.l.sort((e,t)=>t.L-e.L),this.l.length>10){const e=this.l.splice(10);for(const t of e)this.u.delete(t.id)}this.p?.(n)}}}const A=e=>{const t=globalThis.requestIdleCallback||setTimeout,n=globalThis.cancelIdleCallback||clearTimeout;if("hidden"===document.visibilityState)e();else{const i=l(e);let s=-1;const o=()=>{n(s),i()};addEventListener("visibilitychange",o,{once:!0,capture:!0}),s=t(()=>{removeEventListener("visibilitychange",o,{capture:!0}),i()})}},B=[200,500];class S{m;h(e){this.m?.(e)}}const q=[2500,4e3],N=[800,1800],H=e=>{document.prerendering?y(()=>H(e)):"complete"!==document.readyState?addEventListener("load",()=>H(e),!0):setTimeout(e)};return e.CLSThresholds=E,e.FCPThresholds=T,e.INPThresholds=B,e.LCPThresholds=q,e.TTFBThresholds=N,e.onCLS=(e,t={})=>{const o=v();b(l(()=>{let r,a=c("CLS",0);const l=d(t,h),u=e=>{for(const t of e)l.h(t);l.i>a.value&&(a.value=l.i,a.entries=l.o,r())},m=f("layout-shift",u);m&&(r=i(e,a,E,t.reportAllChanges),o.onHidden(()=>{u(m.takeRecords()),r(!0)}),n(()=>{l.i=0,a=c("CLS",0),r=i(e,a,E,t.reportAllChanges),s(r)}),setTimeout(r))}))},e.onFCP=b,e.onINP=(e,t={})=>{if(!globalThis.PerformanceEventTiming||!("interactionId"in PerformanceEventTiming.prototype))return;const s=v();y(()=>{I();let o,r=c("INP");const a=d(t,k),h=e=>{A(()=>{for(const t of e)a.h(t);const t=a.T();t&&t.L!==r.value&&(r.value=t.L,r.entries=t.entries,o())})},l=f("event",h,{durationThreshold:t.durationThreshold??40});o=i(e,r,B,t.reportAllChanges),l&&(l.observe({type:"first-input",buffered:!0}),s.onHidden(()=>{h(l.takeRecords()),o(!0)}),n(()=>{a.v(),r=c("INP"),o=i(e,r,B,t.reportAllChanges)}))})},e.onLCP=(e,t={})=>{y(()=>{const o=v();let a,h=c("LCP");const u=d(t,S),m=e=>{t.reportAllChanges||(e=e.slice(-1));for(const t of e)u.h(t),t.startTime<o.firstHiddenTime&&(h.value=Math.max(t.startTime-r(),0),h.entries=[t],a())},g=f("largest-contentful-paint",m);if(g){a=i(e,h,q,t.reportAllChanges);const o=l(()=>{m(g.takeRecords()),g.disconnect(),a(!0)}),r=e=>{e.isTrusted&&(A(o),removeEventListener(e.type,r,{capture:!0}))};for(const e of["keydown","click","visibilitychange"])addEventListener(e,r,{capture:!0});n(n=>{h=c("LCP"),a=i(e,h,q,t.reportAllChanges),s(()=>{h.value=performance.now()-n.timeStamp,a(!0)})})}})},e.onTTFB=(e,t={})=>{let s=c("TTFB"),a=i(e,s,N,t.reportAllChanges);H(()=>{const d=o();d&&(s.value=Math.max(d.responseStart-r(),0),s.entries=[d],a(!0),n(()=>{s=c("TTFB",0),a=i(e,s,N,t.reportAllChanges),a(!0)}))})},e}({});