/**
 *  Checks to see if a given string is a valid url.
 *  Accepts http:// or https://.
 *  May start also with www (Not mandatory).
 * @type {RegExp}
 */
export declare const validUrl: RegExp;
/**
 * Check to see if a given string is a valid
 * base64 image
 */
export declare const validBase64Image: RegExp;
/**
 * Check to see if a given string is a valid
 * url or valid base64.
 * @param mediaLink
 */
export declare const isValidMediaLink: (mediaLink: string) => boolean;