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.
Methods
slice(): Blob
start?: number,
end?: number,
contentType?: string,
stream(): ReadableStream<Uint8Array>
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.
type
{ readonly prototype: Blob; new (blobParts?: BlobPart[], options?: BlobPropertyBag): Blob; }