/**
 * Retrieves an image by name from the cached images endpoint.
 * Returns a readable stream for the image data.
 *
 * @param imageName - Name/identifier of the image to retrieve
 * @returns Promise resolving to ReadableStream of image data, or null/undefined on error
 * @throws Image stream on error (legacy behavior)
 *
 * @example
 * const imageStream = await GetImageApi("profile-pic-123.jpg");
 * if (imageStream) {
 *   // Process image stream
 * }
 */
export declare function GetImageApi(imageName: string): Promise<ReadableStream<Uint8Array> | null | undefined>;