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+---
+title: WritableStreamDefaultWriter.closed
+slug: Web/API/WritableStreamDefaultWriter/closed
+tags:
+  - API
+  - Experimental
+  - Property
+  - Reference
+  - Streams
+  - WritableStreamDefaultWriter
+  - closed
+translation_of: Web/API/WritableStreamDefaultWriter/closed
+---
+<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>closed</code></strong> 読み取り専用プロパティは、ストリームが閉じられた場合、またはライターのロックが解除された場合に満たし、ストリームがエラーの場合に拒否する promise を返します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var><code>var <em>closed</em> = </code>writableStreamDefaultWriter</var>.closed;</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>{{jsxref("Promise")}}。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<pre class="brush: js">const writableStream = new WritableStream({
+  start(controller) {
+  },
+  write(chunk, controller) {
+    ...
+  },
+  close(controller) {
+    ...
+  },
+  abort(err) {
+    ...
+  }
+}, queuingStrategy);
+
+...
+
+const writer = writableStream.getWriter();
+
+..
+
+// ストリームが閉じているかどうかを確認します
+writer.closed.then(() =&gt; {
+  console.log('writer closed');
+})</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-closed","closed")}}</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.closed")}}</p>