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Let's try\nthat next.`})]})}function u(n={}){let{wrapper:e}=n.components||{};return e?(0,t.jsx)(e,{...n,children:(0,t.jsx)(h,{...n})}):h(n)}function b(n,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+n+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return x(j);})();\n;return Component;",[620],"https://www.epicreact.dev/workshops/react-performance/lazy/solution",{"_9":607,"_607":608},{"_9":607,"_611":623,"_235":236},7031,"https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/04.code-splitting/01.solution.lazy?view=both&title=lazy+%28solution%29","problemName",{"_314":329,"_311":627,"_328":636},{"_20":103,"_188":499,"_585":628,"_22":104,"_24":105,"_587":629,"_602":630,"_605":632,"_609":633,"_613":635,"_312":416,"_314":329,"_9":311,"_615":107},"02.problem.eager","var Component=(()=>{var p=Object.create;var a=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var m=Object.getOwnPropertyNames;var f=Object.getPrototypeOf,g=Object.prototype.hasOwnProperty;var w=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),x=(t,e)=>{for(var n in e)a(t,n,{get:e[n],enumerable:!0})},c=(t,e,n,i)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of m(e))!g.call(t,r)&&r!==n&&a(t,r,{get:()=>e[r],enumerable:!(i=u(e,r))||i.enumerable});return t};var y=(t,e,n)=>(n=t!=null?p(f(t)):{},c(e||!t||!t.__esModule?a(n,\"default\",{value:t,enumerable:!0}):n,t)),b=t=>c(a({},\"__esModule\",{value:!0}),t);var h=w((E,d)=>{d.exports=_jsx_runtime});var _={};x(_,{default:()=>l,frontmatter:()=>k});var o=y(h()),k=void 0;function s(t){let e={code:\"code\",h1:\"h1\",p:\"p\",...t.components},{EpicVideo:n}=e;return n||v(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Eager Loading\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-performance/eager-loading\"}),`\n`,(0,o.jsxs)(e.p,{children:[`\\u{1F468}\\u200D\\u{1F4BC} So it's great that the users can get the app loaded faster, but it's annoying\nwhen 99% of the time the reason the users are using the app is so they can\ninteract with our globe. We don't want to have to make them wait first to load\nthe app and then again to load the globe. Wouldn't it be cool if we could have\nglobe start loading as soon as the user hovers over the checkbox? So if they\n`,(0,o.jsx)(e.code,{children:\"pointerOver\"}),\" or \",(0,o.jsx)(e.code,{children:\"focus\"}),\" the \",(0,o.jsx)(e.code,{children:\"\"}),` for the checkbox, we should kick off a\ndynamic import for the globe module.`]}),`\n`,(0,o.jsx)(e.p,{children:\"See if you can make that work.\"}),`\n`,(0,o.jsx)(\"callout-success\",{children:(0,o.jsxs)(e.p,{children:[\"Tip: It doesn't matter how many times you call \",(0,o.jsx)(e.code,{children:\"import('./path-to-module')\"}),`,\nvite will only actually load the module once.`]})})]})}function l(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(s,{...t})}):s(t)}function v(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return b(_);})();\n;return Component;",[631],"https://www.epicreact.dev/workshops/react-performance/eager-loading",{"_9":607,"_607":608},{"_9":607,"_611":634,"_235":236},6032,"https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/04.code-splitting/02.problem.eager?view=both&title=Eager+Loading+%28problem%29",{"_20":107,"_188":499,"_585":637,"_22":108,"_24":109,"_587":638,"_602":639,"_605":641,"_609":642,"_613":644,"_312":416,"_314":329,"_9":328,"_625":-5},"02.solution.eager","var Component=(()=>{var l=Object.create;var i=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var m=Object.getOwnPropertyNames;var w=Object.getPrototypeOf,f=Object.prototype.hasOwnProperty;var g=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),x=(t,e)=>{for(var n in e)i(t,n,{get:e[n],enumerable:!0})},s=(t,e,n,a)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of m(e))!f.call(t,r)&&r!==n&&i(t,r,{get:()=>e[r],enumerable:!(a=u(e,r))||a.enumerable});return t};var y=(t,e,n)=>(n=t!=null?l(w(t)):{},s(e||!t||!t.__esModule?i(n,\"default\",{value:t,enumerable:!0}):n,t)),_=t=>s(i({},\"__esModule\",{value:!0}),t);var d=g((M,c)=>{c.exports=_jsx_runtime});var b={};x(b,{default:()=>p,frontmatter:()=>j});var o=y(d()),j=void 0;function h(t){let e={h1:\"h1\",p:\"p\",...t.components},{EpicVideo:n}=e;return n||E(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Eager Loading\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-performance/eager-loading/solution\"}),`\n`,(0,o.jsx)(e.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} Great. Now we're loading it a bit sooner. In general, this is a helpful\npractice to reduce the amount of time between when the user indicates they want\nto see something and when they actually see it.`}),`\n`,(0,o.jsx)(e.p,{children:\"The key is knowing when to load things eagerly.\"})]})}function p(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(h,{...t})}):h(t)}function E(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return _(b);})();\n;return Component;",[640],"https://www.epicreact.dev/workshops/react-performance/eager-loading/solution",{"_9":607,"_607":608},{"_9":607,"_611":643,"_235":236},7032,"https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/04.code-splitting/02.solution.eager?view=both&title=Eager+Loading+%28solution%29",{"_314":315,"_311":646,"_328":655},{"_20":111,"_188":501,"_585":647,"_22":112,"_24":113,"_587":648,"_602":649,"_605":651,"_609":652,"_613":654,"_312":416,"_314":315,"_9":311,"_615":115},"03.problem.transition","var Component=(()=>{var p=Object.create;var a=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var w=Object.getPrototypeOf,m=Object.prototype.hasOwnProperty;var y=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),b=(t,e)=>{for(var o in e)a(t,o,{get:e[o],enumerable:!0})},s=(t,e,o,r)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let i of f(e))!m.call(t,i)&&i!==o&&a(t,i,{get:()=>e[i],enumerable:!(r=u(e,i))||r.enumerable});return t};var g=(t,e,o)=>(o=t!=null?p(w(t)):{},s(e||!t||!t.__esModule?a(o,\"default\",{value:t,enumerable:!0}):o,t)),x=t=>s(a({},\"__esModule\",{value:!0}),t);var c=y((T,d)=>{d.exports=_jsx_runtime});var _={};b(_,{default:()=>h,frontmatter:()=>k});var n=g(c()),k=void 0;function l(t){let e={a:\"a\",code:\"code\",h1:\"h1\",p:\"p\",...t.components},{EpicVideo:o}=e;return o||v(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Transitions\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/react-performance/transitions\"}),`\n`,(0,n.jsxs)(e.p,{children:[\"\\u{1F468}\\u200D\\u{1F4BC} By default, when a component suspends (like our \",(0,n.jsx)(e.code,{children:\"lazy\"}),` component is while\nwe're lazy-loading some code), React will render the fallback of our suspense\nboundary immediately. Go ahead and try it now. Hover over the checkbox for long\nenough for the code to load and then check it. You'll notice even though the\ncode is ready to go, it still shows our fallback UI.`]}),`\n`,(0,n.jsx)(e.p,{children:`The reason this happens is React wants to help us avoid a flash of loading\nstate because it doesn't know whether our content will be ready immediately or\nnot. So React shows the fallback immediately, then when it sees the content is\nalready ready, it will actually wait a little bit before switching from the\nfallback to the real content. This is a good default, but it's definitely not\nthe best user experience for our situation.`}),`\n`,(0,n.jsxs)(e.p,{children:[\"So instead, we can wrap our state update \",(0,n.jsx)(e.code,{children:\"setShowGlobe\"}),` in a transition so React\ndoesn't go to the suspense fallback and instead we can show a pending UI if we\nso decide.`]}),`\n`,(0,n.jsxs)(e.p,{children:[`This is similar to what we've done in the past, so if you'd like you can add\n`,(0,n.jsx)(e.code,{children:\"useSpinDelay\"}),\" from \",(0,n.jsx)(e.a,{href:\"https://npm.im/spin-delay\",children:(0,n.jsx)(e.code,{children:\"spin-delay\"})}),` to prevent pushing\nthe flash of loading state to later if the globe's code isn't quite ready yet.`]}),`\n`,(0,n.jsx)(e.p,{children:(0,n.jsxs)(e.a,{href:\"https://react.dev/reference/react/useTransition\",children:[\"\\u{1F4DC} \",(0,n.jsx)(e.code,{children:\"useTransition\"})]})})]})}function h(t={}){let{wrapper:e}=t.components||{};return e?(0,n.jsx)(e,{...t,children:(0,n.jsx)(l,{...t})}):l(t)}function v(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return x(_);})();\n;return Component;",[650],"https://www.epicreact.dev/workshops/react-performance/transitions",{"_9":607,"_607":608},{"_9":607,"_611":653,"_235":236},6033,"https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/04.code-splitting/03.problem.transition?view=both&title=Transitions+%28problem%29",{"_20":115,"_188":501,"_585":656,"_22":116,"_24":117,"_587":657,"_602":658,"_605":660,"_609":661,"_613":663,"_312":416,"_314":315,"_9":328,"_625":-5},"03.solution.transition","var Component=(()=>{var m=Object.create;var i=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var h=Object.getOwnPropertyNames;var l=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var w=(e,t)=>()=>(t||e((t={exports:{}}).exports,t),t.exports),_=(e,t)=>{for(var n in t)i(e,n,{get:t[n],enumerable:!0})},c=(e,t,n,s)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of h(t))!x.call(e,r)&&r!==n&&i(e,r,{get:()=>t[r],enumerable:!(s=u(t,r))||s.enumerable});return e};var g=(e,t,n)=>(n=e!=null?m(l(e)):{},c(t||!e||!e.__esModule?i(n,\"default\",{value:e,enumerable:!0}):n,e)),j=e=>c(i({},\"__esModule\",{value:!0}),e);var p=w((y,a)=>{a.exports=_jsx_runtime});var k={};_(k,{default:()=>f,frontmatter:()=>E});var o=g(p()),E=void 0;function d(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:n}=t;return n||M(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(t.h1,{children:\"Transitions\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-performance/transitions/solution\"}),`\n`,(0,o.jsx)(t.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} React gives us lots of options to control the user experience we're after\nwhile also optimizing things for performance. Great work on this one!`})]})}function f(e={}){let{wrapper:t}=e.components||{};return t?(0,o.jsx)(t,{...e,children:(0,o.jsx)(d,{...e})}):d(e)}function M(e,t){throw new Error(\"Expected \"+(t?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return j(k);})();\n;return Component;",[659],"https://www.epicreact.dev/workshops/react-performance/transitions/solution",{"_9":607,"_607":608},{"_9":607,"_611":662,"_235":236},7033,"https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/04.code-splitting/03.solution.transition?view=both&title=Transitions+%28solution%29",[665,669,673],{"_20":95,"_188":497,"_585":600,"_22":96,"_24":97,"_587":601,"_602":666,"_605":667,"_609":668,"_613":614,"_312":416,"_314":390,"_9":311,"_615":99},[604],{"_9":607,"_607":608},{"_9":607,"_611":612,"_235":236},{"_20":103,"_188":499,"_585":628,"_22":104,"_24":105,"_587":629,"_602":670,"_605":671,"_609":672,"_613":635,"_312":416,"_314":329,"_9":311,"_615":107},[631],{"_9":607,"_607":608},{"_9":607,"_611":634,"_235":236},{"_20":111,"_188":501,"_585":647,"_22":112,"_24":113,"_587":648,"_602":674,"_605":675,"_609":676,"_613":654,"_312":416,"_314":315,"_9":311,"_615":115},[650],{"_9":607,"_607":608},{"_9":607,"_611":653,"_235":236},[678,682,686],{"_20":99,"_188":497,"_585":617,"_22":100,"_24":101,"_587":618,"_602":679,"_605":680,"_609":681,"_613":624,"_312":416,"_314":390,"_9":328,"_625":-5},[620],{"_9":607,"_607":608},{"_9":607,"_611":623,"_235":236},{"_20":107,"_188":499,"_585":637,"_22":108,"_24":109,"_587":638,"_602":683,"_605":684,"_609":685,"_613":644,"_312":416,"_314":329,"_9":328,"_625":-5},[640],{"_9":607,"_607":608},{"_9":607,"_611":643,"_235":236},{"_20":115,"_188":501,"_585":656,"_22":116,"_24":117,"_587":657,"_602":687,"_605":688,"_609":689,"_613":663,"_312":416,"_314":315,"_9":328,"_625":-5},[659],{"_9":607,"_607":608},{"_9":607,"_611":662,"_235":236},"exerciseFormEmbedUrl","https://docs.google.com/forms/d/e/1FAIpQLSf3o9xyjQepTlOTH5Z7ZwkeSTdXh6YWI_RGc9KiyD3oUN0p6w/viewform?hl=en&embedded=true&entry.1836176234=React%20Performance%20%E2%9A%A1&entry.428900931=Code%20Splitting","epicVideoInfosPromise",["P",693],"exerciseFinished",{"_696":697,"_24":698},"file","/myapp/workshop-content/exercises/04.code-splitting/FINISHED.mdx","exercises/04.code-splitting/FINISHED.mdx","prevStepLink",{"_701":702,"_703":704},"to","/exercise/04/03/solution","aria-label","Transitions (solution)","nextStepLink",{"_701":707,"_703":517},"/exercise/05","actionData","errors"]

04. Code Splitting/Elaboration