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<!DOCTYPE html><html class="default" lang="en"><head><meta charSet="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>default | wretch</title><meta name="description" content="Documentation for wretch"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/search.js" id="tsd-search-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os"</script><header class="tsd-page-toolbar">
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<h1>Function default</h1></div>
<section class="tsd-panel">
<ul class="tsd-signatures">
<li class="tsd-signature tsd-anchor-link" id="default"><span class="tsd-kind-call-signature">default</span><span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="../types/index.WretchAddon.html" class="tsd-signature-type tsd-kind-type-alias">WretchAddon</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">, </span><a href="../interfaces/addons_perfs.PerfsAddon.html" class="tsd-signature-type tsd-kind-interface">PerfsAddon</a><span class="tsd-signature-symbol">></span><a href="#default" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><g stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round" id="icon-anchor"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M10 14a3.5 3.5 0 0 0 5 0l4 -4a3.5 3.5 0 0 0 -5 -5l-.5 .5"></path><path d="M14 10a3.5 3.5 0 0 0 -5 0l-4 4a3.5 3.5 0 0 0 5 5l.5 -.5"></path></g></svg></a></li>
<li class="tsd-description">
<div class="tsd-comment tsd-typography"><p>Adds the ability to measure requests using the Performance Timings API.</p>
<p>Uses the Performance API
(<a href="https://developer.mozilla.org/en-US/docs/Web/API/Performance_API">browsers</a> &
<a href="https://nodejs.org/api/perf_hooks.html">node.js</a>) to expose timings related to
the underlying request.</p>
<p>Browser timings are very accurate, node.js only contains raw measures.</p>
<pre><code class="language-js"><span class="hl-8">import</span><span class="hl-2"> </span><span class="hl-6">PerfsAddon</span><span class="hl-2"> </span><span class="hl-8">from</span><span class="hl-2"> </span><span class="hl-5">"wretch/addons/perfs"</span><br/><br/><span class="hl-0">// Use perfs() before the response types (text, json, ...)</span><br/><span class="hl-4">wretch</span><span class="hl-2">(</span><span class="hl-5">"..."</span><span class="hl-2">)</span><br/><span class="hl-2"> .</span><span class="hl-4">addon</span><span class="hl-2">(</span><span class="hl-4">PerfsAddon</span><span class="hl-2">())</span><br/><span class="hl-2"> .</span><span class="hl-4">get</span><span class="hl-2">()</span><br/><span class="hl-2"> .</span><span class="hl-4">perfs</span><span class="hl-2">((</span><span class="hl-6">timings</span><span class="hl-2">) </span><span class="hl-1">=></span><span class="hl-2"> {</span><br/><span class="hl-2"> </span><span class="hl-0">// Will be called when the timings are ready.</span><br/><span class="hl-6">console</span><span class="hl-2">.</span><span class="hl-4">log</span><span class="hl-2">(</span><span class="hl-6">timings</span><span class="hl-2">.</span><span class="hl-6">startTime</span><span class="hl-2">);</span><br/><span class="hl-2"> })</span><br/><span class="hl-2"> .</span><span class="hl-4">res</span><span class="hl-2">();</span><br/>
</code><button>Copy</button></pre>
<p>For node.js, there is a little extra work to do :</p>
<pre><code class="language-js"><span class="hl-0">// Node.js only</span><br/><span class="hl-1">const</span><span class="hl-2"> { </span><span class="hl-3">performance</span><span class="hl-2">, </span><span class="hl-3">PerformanceObserver</span><span class="hl-2"> } = </span><span class="hl-4">require</span><span class="hl-2">(</span><span class="hl-5">"perf_hooks"</span><span class="hl-2">);</span><br/><br/><span class="hl-6">wretch</span><span class="hl-2">.</span><span class="hl-4">polyfills</span><span class="hl-2">({</span><br/><span class="hl-2"> </span><span class="hl-4">fetch</span><span class="hl-6">:</span><span class="hl-2"> </span><span class="hl-1">function</span><span class="hl-2"> (</span><span class="hl-6">url</span><span class="hl-2">, </span><span class="hl-6">opts</span><span class="hl-2">) {</span><br/><span class="hl-2"> </span><span class="hl-6">performance</span><span class="hl-2">.</span><span class="hl-4">mark</span><span class="hl-2">(</span><span class="hl-6">url</span><span class="hl-2"> + </span><span class="hl-5">" - begin"</span><span class="hl-2">);</span><br/><span class="hl-2"> </span><span class="hl-8">return</span><span class="hl-2"> </span><span class="hl-4">fetch</span><span class="hl-2">(</span><span class="hl-6">url</span><span class="hl-2">, </span><span class="hl-6">opts</span><span class="hl-2">).</span><span class="hl-4">then</span><span class="hl-2">(</span><span class="hl-6">res</span><span class="hl-2"> </span><span class="hl-1">=></span><span class="hl-2"> {</span><br/><span class="hl-2"> </span><span class="hl-6">performance</span><span class="hl-2">.</span><span class="hl-4">mark</span><span class="hl-2">(</span><span class="hl-6">url</span><span class="hl-2"> + </span><span class="hl-5">" - end"</span><span class="hl-2">);</span><br/><span class="hl-2"> </span><span class="hl-4">setTimeout</span><span class="hl-2">(() </span><span class="hl-1">=></span><span class="hl-2"> </span><span class="hl-6">performance</span><span class="hl-2">.</span><span class="hl-4">measure</span><span class="hl-2">(</span><span class="hl-6">res</span><span class="hl-2">.</span><span class="hl-6">url</span><span class="hl-2">, </span><span class="hl-6">url</span><span class="hl-2"> + </span><span class="hl-5">" - begin"</span><span class="hl-2">, </span><span class="hl-6">url</span><span class="hl-2"> + </span><span class="hl-5">" - end"</span><span class="hl-2">), </span><span class="hl-7">0</span><span class="hl-2">);</span><br/><span class="hl-2"> </span><span class="hl-8">return</span><span class="hl-2"> </span><span class="hl-6">res</span><span class="hl-2">;</span><br/><span class="hl-2"> });</span><br/><span class="hl-2"> },</span><br/><span class="hl-2"> </span><span class="hl-0">// other polyfills…</span><br/><span class="hl-2"> </span><span class="hl-6">performance:</span><span class="hl-2"> </span><span class="hl-6">performance</span><span class="hl-2">,</span><br/><span class="hl-2"> </span><span class="hl-6">PerformanceObserver:</span><span class="hl-2"> </span><span class="hl-6">PerformanceObserver</span><span class="hl-2">,</span><br/><span class="hl-2">});</span>
</code><button>Copy</button></pre>
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<h4 class="tsd-returns-title">Returns <a href="../types/index.WretchAddon.html" class="tsd-signature-type tsd-kind-type-alias">WretchAddon</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">unknown</span><span class="tsd-signature-symbol">, </span><a href="../interfaces/addons_perfs.PerfsAddon.html" class="tsd-signature-type tsd-kind-interface">PerfsAddon</a><span class="tsd-signature-symbol">></span></h4>
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<ul>
<li>Defined in <a href="https://github.com/elbywan/wretch/blob/b183cf7/src/addons/perfs.ts#L58">src/addons/perfs.ts:58</a></li></ul></aside></li></ul></section></div>
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