21 lines
449 B
Markdown
21 lines
449 B
Markdown
---
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title: isStream
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tags: node,type,intermediate
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---
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Checks if the given argument is a stream.
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- Check if the value is different from `null`.
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- Use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.
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```js
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const isStream = val =>
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val !== null && typeof val === 'object' && typeof val.pipe === 'function';
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```
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```js
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const fs = require('fs');
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isStream(fs.createReadStream('test.txt')); // true
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```
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