/**
 * Returns a new array with unique items by the given key
 */
export declare function uniqBy<T>(array: T[], key: keyof T): T[];
/**
 * Convert Record of attributes to a valid HTML string
 */
export declare function makeAttributes(attributes: Record<string, string | boolean>): string;
/**
 * Add a trailing slash if missing
 */
export declare const addTrailingSlash: (url: string) => string;