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javascript/snippets/is-stream.md

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+---
+title: Value is stream
+type: snippet
+tags: [node,type]
+cover: mountain-lake-cottage-2
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+Checks if the given argument is a stream.
+
+- Check if the value is different from `null`.
+- Use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.
+
+```js
+const isStream = val =>
+  val !== null && typeof val === 'object' && typeof val.pipe === 'function';
+```
+
+```js
+const fs = require('fs');
+
+isStream(fs.createReadStream('test.txt')); // true
+```