web-vitals/dist/web-vitals.umd.cjs

Easily measure performance metrics in JavaScript

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n=!1;return()=>{n||(t(),n=!0)}};class E{h}const M=t=>{document.prerendering?addEventListener("prerenderingchange",t,!0):t()},_=[1800,3e3],L=(t,n={})=>{const a=b(n);M(()=>{const c=v(n,E),f=h();let d,l=u("FCP");const g=m(["paint"],t=>{for(const n of t)"first-contentful-paint"===n.name&&(g.disconnect(),n.startTime<f.firstHiddenTime&&(l.value=Math.max(n.startTime-r(),0),l.entries.push(n),l.navigationId=n.navigationId||l.navigationId,d(!0)))});if(g&&(d=o(t,l,_,n.reportAllChanges),i(i=>{l=u("FCP",-1,"back-forward-cache",l.navigationId,l.navigationInteractionId,l.navigationURL,e()),d=o(t,l,_,n.reportAllChanges),s(()=>{l.value=performance.now()-i.timeStamp,d(!0)})})),a){m(["soft-navigation"],e=>{e.forEach(e=>{c.h&&e.navigationId&&y(c.h,e);const i=Math.max((e.presentationTime||e.paintTime||0)-e.startTime,0);l=u("FCP",i,"soft-navigation",e.navigationId,e.interactionId,e.name,e.startTime),d=o(t,l,_,n.reportAllChanges),d(!0)})},n)}})},P=[.1,.25];let w=0,k=1/0,I=0;const C=t=>{for(const n of t)n.interactionId&&(k=Math.min(k,n.interactionId),I=Math.max(I,n.interactionId),w=I?(I-k)/7+1:0)};let F;const B=()=>F?w:performance.interactionCount??0,N=()=>{"interactionCount"in performance||F||(F=m(["event"],C,{durationThreshold:0}))};let S=0;class q{u=[];v=new Map;p;m;T(){S=B(),this.u.length=0,this.v.clear()}M(t){const n=B()-S,e=Math.min(this.u.length-1,Math.floor(n/50));return!n||-1!==e||"soft-navigation"!==t&&"back-forward-cache"!==t?this.u[e]:{_:8,id:-1,entries:[]}}l(t){if(this.p?.(t),!t.interactionId&&"first-input"!==t.entryType)return;const n=this.u.at(-1);let e=this.v.get(t.interactionId);if(e||this.u.length<10||t.duration>n._){if(e?t.duration>e._?(e.entries=[t],e._=t.duration):t.duration===e._&&t.startTime===e.entries[0].startTime&&e.entries.push(t):(e={id:t.interactionId,entries:[t],_:t.duration},this.v.set(e.id,e),this.u.push(e)),this.u.sort((t,n)=>n._-t._),this.u.length>10){const t=this.u.splice(10);for(const n of t)this.v.delete(n.id)}this.m?.(e)}}}const x=t=>{const n="requestIdleCallback"in globalThis?1e3:0,e=globalThis.requestIdleCallback||setTimeout,i=globalThis.cancelIdleCallback||clearTimeout;if("hidden"===document.visibilityState)t();else{const o=T(t);let s=-1;const a=()=>{i(s),o()};addEventListener("visibilitychange",a,{once:!0,capture:!0}),s=e(()=>{removeEventListener("visibilitychange",a,{capture:!0}),o()},{timeout:n})}},A=[200,500];class O{p;h;l(t){this.p?.(t)}}const H=[2500,4e3],U=[800,1800],W=t=>{document.prerendering?M(()=>W(t)):"complete"!==document.readyState?addEventListener("load",()=>W(t),!0):setTimeout(t)};t.CLSThresholds=P,t.FCPThresholds=_,t.INPThresholds=A,t.LCPThresholds=H,t.TTFBThresholds=U,t.onCLS=(t,n={})=>{const a=h();L(T(()=>{let r,c=u("CLS",0);const f=v(n,p),d=(e,i,s,a,d)=>{c=u("CLS",0,e,i,s,a,d),f.i=0,r=o(t,c,P,n.reportAllChanges)},l=(t=!1)=>{f.i>c.value&&(c.value=f.i,c.entries=f.o),r(t)},h=t=>{l(!0),d("soft-navigation",t.navigationId,t.interactionId,t.name,t.startTime)},g=t=>{for(const n of t)"soft-navigation"!==n.entryType?f.l(n):h(n);l()},y=["layout-shift"];b(n)&&y.push("soft-navigation");const T=m(y,g);T&&(r=o(t,c,P,n.reportAllChanges),a.onHidden(()=>{g(T.takeRecords()),r(!0)}),i(()=>{d("back-forward-cache",c.navigationId,c.navigationInteractionId,c.navigationURL,e()),s(r)}),setTimeout(r))}))},t.onFCP=L,t.onINP=(t,n={})=>{if(!globalThis.PerformanceEventTiming||!("interactionId"in PerformanceEventTiming.prototype))return;const s=h();M(()=>{N();let a,r=u("INP");const c=v(n,q),f=(e,i,s,f,d)=>{c.T(),r=u("INP",-1,e,i,s,f,d),a=o(t,r,A,n.reportAllChanges)},d=()=>{const t=c.M(r.navigationType);t&&t._!==r.value&&(r.value=t._,r.entries=t.entries,a())},l=t=>{d(),a(!0),f("soft-navigation",t.navigationId,t.interactionId,t.name,t.startTime)},h=(t,n=!1)=>{x(()=>{for(const n of t)"soft-navigation"!==n.entryType?c.l(n):l(n);d(),n&&a(!0)})},g=["event","first-input"];b(n)&&g.push("soft-navigation");const 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a=d.responseStart;if(c.value=Math.max(a-r(),0),c.entries=[d],f(!0),i(()=>{c=u("TTFB",0,"back-forward-cache",c.navigationId,c.navigationInteractionId,c.navigationURL,e()),f=o(t,c,U,n.reportAllChanges),f(!0)}),s){m(["soft-navigation"],e=>{e.forEach(e=>{e.navigationId&&(c=u("TTFB",0,"soft-navigation",e.navigationId,e.interactionId,e.name,e.startTime),c.entries=[e],f=o(t,c,U,n.reportAllChanges),f(!0))})},n)}}})}});
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