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+---
+title: WritableStreamDefaultWriter.desiredSize
+slug: Web/API/WritableStreamDefaultWriter/desiredSize
+tags:
+  - API
+  - Experimental
+  - Property
+  - Reference
+  - Streams
+  - WritableStreamDefaultWriter
+  - desiredSize
+translation_of: Web/API/WritableStreamDefaultWriter/desiredSize
+---
+<div>{{draft}}{{SeeCompatTable}}{{APIRef("Streams")}}</div>
+
+<p class="summary"><span class="seoSummary">{{domxref("WritableStreamDefaultWriter")}} インターフェイスの <strong><code>desiredSize</code></strong> 読み取り専用プロパティは、ストリームの内部キューを埋めるために必要な希望サイズを返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var><code>var <em>desiredSize</em> = </code>writableStreamDefaultWriter</var>.desiredSize;</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>整数。 キューがいっぱいになった場合、これは負になる可能性があることに注意してください。</p>
+
+<p>値は、（エラーが発生したか、中止がキューに入れられたために）ストリームに正常に書き込むことができない場合、<code>null</code> になり、ストリームが閉じられると <code>0</code> になります。</p>
+
+<h3 id="Exceptions" name="Exceptions">例外</h3>
+
+<dl>
+ <dt>TypeError</dt>
+ <dd>ライターのロックが解除されています。</dd>
+</dl>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js line-numbers  language-js"><code class="language-js"><span class="keyword token">const</span> writableStream <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">WritableStream</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
+  <span class="function token">write</span><span class="punctuation token">(</span>chunk<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">close</span><span class="punctuation token">(</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span><span class="punctuation token">,</span>
+  <span class="function token">abort</span><span class="punctuation token">(</span>err<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    <span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.</span>
+  <span class="punctuation token">}</span>
+<span class="punctuation token">}</span><span class="punctuation token">,</span> queuingStrategy<span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+<span class="punctuation token">.</span><span class="punctuation token">.</span><span class="punctuation token">.
+
+</span></code><code class="language-js"><span class="punctuation token">const writer = writableStream.getWriter();
+
+...</span></code><code class="language-js">
+
+<span class="comment token">// ストリームの希望サイズを返します</span>
+let size = writer<span class="punctuation token">.</span>desiredSize;</code></pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("Streams","#default-writer-desired-size","desiredSize")}}</td>
+   <td>{{Spec2('Streams')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.WritableStreamDefaultWriter.desiredSize")}}</p>