/**
 * Remove heading and trailing slashes.
 * Examples:
 *  - https://example.com/ -> https://example.com
 *  - /v2/path -> v2/path
 *  - /v2/path/ -> v2/path
 */
export declare function stripSlashes(url: string): string;
/**
 * @see https://stackoverflow.com/a/17415677/1895069
 */
export declare function toIso8601(date: Date): string;