/**
 * Friends command payload definition.
 */
type Friends = {
    /**
     * Friend action to perform.
     */
    action?: 'add' | 'message' | 'joinchat' | 'players' | 'status/away' | 'status/busy' | 'status/invisible' | 'status/trade' | 'status/play' | 'status/offline' | 'status/online';
    /**
     * Friend ID for actions that require it.
     *
     * @example '12345678'
     */
    id?: string;
};
/**
 * Opens Friends window with optional action.
 *
 * @param payload Friends payload.
 * @returns Steam friends URL.
 * @example
 * friends({})
 * // => 'steam://friends/'
 * @example
 * friends({ action: 'add', id: '12345678' })
 * // => 'steam://friends/add/12345678'
 * @example
 * friends({ action: 'message', id: '12345678' })
 * // => 'steam://friends/message/12345678'
 * @example
 * friends({ action: 'status/online' })
 * // => 'steam://friends/status/online'
 * @link https://developer.valvesoftware.com/wiki/Steam_browser_protocol
 */
export declare function friends(payload?: Friends): string;
export {};