promises.FileHandle.read - fs - Node

method promises.FileHandle.read

Usage in Deno

import { type promises } from "node:fs";



FileHandle.read<T extends ArrayBufferView>(buffer: T,
offset?: number | null,
length?: number | null,
position?: number | null,
): Promise<FileReadResult<T>>

Reads data from the file and stores that in the given buffer.

If the file is not modified concurrently, the end-of-file is reached when the number of bytes read is zero.

Type Parameters



T extends ArrayBufferView

Parameters



buffer: T

A buffer that will be filled with the file data read.

optional



offset: number | null

The location in the buffer at which to start filling.

optional



length: number | null

The number of bytes to read.

optional



position: number | null

The location where to begin reading data from the file. If null, data will be read from the current file position, and the position will be updated. If position is an integer, the current file position will remain unchanged.

Return Type

Promise<FileReadResult<T>>

Fulfills upon success with an object with two properties:



FileHandle.read<T extends ArrayBufferView = Buffer>(options?: FileReadOptions<T>): Promise<FileReadResult<T>>

Type Parameters



T extends ArrayBufferView = Buffer

Parameters

optional



options: FileReadOptions<T>

Return Type

Promise<FileReadResult<T>>