/**
 * NOTE: ex. If type is TResult | ((...args: TArgs) => TResult), return "the only" function that returns the TResult.
 */
declare function toCallable<TArgs extends any[] = [], TResult = boolean>(maybeFn: undefined | TResult | ((...args: TArgs) => TResult)): (...args: TArgs) => TResult;
export declare const functionUtil: {
    throttle: <TArgs extends any[]>({ interval }: {
        interval: number;
    }, func: (...args: TArgs) => any) => {
        (...args: TArgs): void;
        isThrottled(): boolean;
    };
    debounce: <TArgs extends any[]>({ delay }: {
        delay: number;
    }, func: (...args: TArgs) => any) => {
        (...args: TArgs): void;
        cancel(): void;
        isPending(): boolean;
        flush(...args: TArgs): void;
    };
    toCallable: typeof toCallable;
};
export {};