function

fs.openAsBlob

): Promise<Blob>;

Returns a Blob whose data is backed by the given file.

The file must not be modified after the Blob is created. Any modifications will cause reading the Blob data to fail with a DOMException error. Synchronous stat operations on the file when the Blob is created, and before each read in order to detect whether the file data has been modified on disk.

import { openAsBlob } from 'node:fs';

const blob = await openAsBlob('the.file.txt');
const ab = await blob.arrayBuffer();
blob.stream();

Referenced types

class Blob

A file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.

MDN Reference

readonly size: number
MDN Reference
readonly type: string
MDN Reference
arrayBuffer(): Promise<ArrayBuffer>;
Returns a promise that resolves to the contents of the blob as an ArrayBuffer
bytes(): Promise<Uint8Array<ArrayBufferLike>>;
Returns a promise that resolves to the contents of the blob as a Uint8Array (array of bytes) its the same as new Uint8Array(await blob.arrayBuffer())
formData(): Promise<FormData>;
Read the data from the blob as a FormData object.
This first decodes the data from UTF-8, then parses it as a multipart/form-data body or a application/x-www-form-urlencoded body.
The type property of the blob is used to determine the format of the body.
This is a non-standard addition to the Blob API, to make it conform more closely to the BodyMixin API.
json(): Promise<any>;
Read the data from the blob as a JSON object.
This first decodes the data from UTF-8, then parses it as JSON.
slice(
start?: number,
end?: number,
contentType?: string
): Blob;
MDN Reference
stream(): ReadableStream<Uint8Array<ArrayBufferLike>>;
Returns a readable stream of the blob's contents
text(): Promise<string>;
Returns a promise that resolves to the contents of the blob as a string