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82 lines
1.9 KiB
TypeScript
82 lines
1.9 KiB
TypeScript
3 years ago
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import {
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Stream,
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Writable as WritableStream,
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Readable as ReadableStream,
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Duplex as DuplexStream,
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Transform as TransformStream,
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} from 'node:stream';
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/**
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@returns Whether `stream` is a [`Stream`](https://nodejs.org/api/stream.html#stream_stream).
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@example
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```
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import fs from 'node:fs';
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import {isStream} from 'is-stream';
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isStream(fs.createReadStream('unicorn.png'));
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//=> true
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isStream({});
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//=> false
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```
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*/
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export function isStream(stream: unknown): stream is Stream;
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/**
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@returns Whether `stream` is a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable).
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@example
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```
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import fs from 'node:fs';
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import {isWritableStream} from 'is-stream';
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isWritableStream(fs.createWriteStrem('unicorn.txt'));
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//=> true
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```
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*/
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export function isWritableStream(stream: unknown): stream is WritableStream;
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/**
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@returns Whether `stream` is a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
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@example
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```
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import fs from 'node:fs';
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import {isReadableStream} from 'is-stream';
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isReadableStream(fs.createReadStream('unicorn.png'));
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//=> true
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```
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*/
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export function isReadableStream(stream: unknown): stream is ReadableStream;
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/**
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@returns Whether `stream` is a [`stream.Duplex`](https://nodejs.org/api/stream.html#stream_class_stream_duplex).
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@example
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```
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import {Duplex as DuplexStream} from 'node:stream';
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import {isDuplexStream} from 'is-stream';
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isDuplexStream(new DuplexStream());
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//=> true
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```
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*/
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export function isDuplexStream(stream: unknown): stream is DuplexStream;
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/**
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@returns Whether `stream` is a [`stream.Transform`](https://nodejs.org/api/stream.html#stream_class_stream_transform).
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@example
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```
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import fs from 'node:fs';
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import StringifyStream from 'streaming-json-stringify';
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import {isTransformStream} from 'is-stream';
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isTransformStream(StringifyStream());
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//=> true
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```
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*/
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export function isTransformStream(stream: unknown): stream is TransformStream;
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