type BufferLike = ArrayBuffer | string | ArrayBufferView | Blob
type StreamLike = ReadableStream<Uint8Array> | AsyncIterable<BufferLike>

/** The file name, modification date and size will be read from the input;
 * extra arguments can be given to override the input’s metadata. */
 type InputWithMeta = File | Response | { input: File | Response, name?: any, lastModified?: any, size?: number | bigint, mode?: number }

 /** Intrinsic size, but the file name must be provided and modification date can’t be guessed. */
 type InputWithSizeMeta = { input: BufferLike, name: any, lastModified?: any, size?: number | bigint, mode?: number }
 
 /** The file name must be provided ; modification date and content length can’t be guessed. */
 type InputWithoutMeta = { input: StreamLike, name: any, lastModified?: any, size?: number | bigint, mode?: number }
 
/** The folder name must be provided ; modification date can’t be guessed. */
type InputFolder = { name: any, lastModified?: any, input?: never, size?: never, mode?: number }

 /** Both filename and size must be provided ; input is not helpful here. */
 type JustMeta = { input?: StreamLike | undefined, name: any, lastModified?: any, size: number | bigint, mode?: number }
 
 type ForAwaitable<T> = AsyncIterable<T> | Iterable<T>
 
 type Options = {
  /** If provided, the returned Response will have its `Content-Length` header set to this value.
  * It can be computed accurately with the `predictLength` function. */
  length?: number | bigint
  /** If provided, the returned Response will have its `Content-Length` header set to the result of
  * calling `predictLength` on that metadata. Overrides the `length` option. */
  metadata?: Iterable<InputWithMeta | InputWithSizeMeta | JustMeta>
  /** The ZIP *language encoding flag* will always be set when a filename was given as a string,
   * but when it is given as an ArrayView or ArrayBuffer, it depends on this option :
   * - `true`: always on (ArrayBuffers will *always* be flagged as UTF-8) — recommended,
   * - `false`: always off (ArrayBuffers will *never* be flagged as UTF-8),
   * - `undefined`: each ArrayBuffer will be tested and flagged if it is valid UTF-8. */
  buffersAreUTF8?: boolean
} 

/** Given an iterable of file metadata (or equivalent),
 * @returns the exact byte length of the Zip file that would be generated by `downloadZip`. */
export declare function predictLength(files: Iterable<InputWithMeta | InputWithSizeMeta | JustMeta | InputFolder>): bigint

export declare function downloadZip(files: ForAwaitable<InputWithMeta | InputWithSizeMeta | InputWithoutMeta | InputFolder>, options?: Options): Response

export declare function makeZip(files: ForAwaitable<InputWithMeta | InputWithSizeMeta | InputWithoutMeta | InputFolder>, options?: Options): ReadableStream<Uint8Array>