export declare function convertToExpression<T>(payload: T, join: string): string;
/**
 * Generate a random filename with or without an
 * extension depending on the file type
 *
 * **Example**
 * - history.pptx -> history-186dgs.pptx
 * - image.jpg -> image-326gds
 * - video.mp4 -> video-434gas
 * - audio.jpg -> audio-149gds
 *
 * For more information visit: https://cloudinary.com/documentation/image_upload_api_reference#upload_optional_parameters
 */
export declare function CustomFilename(): (target: Object, key: string | symbol, descriptor: PropertyDescriptor) => void;