/**
* Build a `File` from any byte-bearing source. Useful for multipart
* uploads (vision, audio, files endpoints) where the source might be a
* string, Uint8Array, ArrayBuffer, Blob, ReadableStream, or async
* iterable (Node fs.ReadStream, generators, etc.).
*
* The result is a real `File` with a working `arrayBuffer()` /
* `stream()` / `text()` so it can be appended to FormData and read by
* fetch implementations across runtimes.
*/
export type FileSource = string | Uint8Array | ArrayBuffer | Blob | ReadableStream<Uint8Array> | AsyncIterable<Uint8Array | string>;
export interface ToFileOptions {
	/** MIME type. Default: 'application/octet-stream'. */
	type?: string;
	/** lastModified epoch ms. Default: now. */
	lastModified?: number;
}
export declare function toFile(name: string, source: FileSource, options?: ToFileOptions): Promise<File>;