Type Alias: AttachmentContent

type AttachmentContent = 
  | File
  | Blob
  | Uint8Array
  | ReadableStream<Uint8Array | string>
  | AsyncIterable<Uint8Array | string>
  | string;

Defined in: src/core/formData/attachmentInput.ts:8

Anything you can hand to an attachment endpoint as file content.

Deliberately spelled with web types only, so the declaration compiles in a browser project that has no @types/node. Nothing is lost by it: Node's Buffer extends Uint8Array, and a Readable stream is structurally an AsyncIterable, so both still fit — they just are not named here.