export { useEffect, useRef, useState };
declare type Ref<T> = {
    current: T;
};
declare type StateUpdater<T> = (value: T) => T;
declare function useRef<T>(value: T): Ref<T>;
declare function useRef<T>(): Ref<T | null>;
declare function useState<T>(value: T): [value: T, setter: (updater: StateUpdater<T>) => void];
declare function useEffect<T extends any[]>(action: () => void, deps?: T | null): void;