import { type Ref } from 'vue';
export type UseSetStateAction<S> = S | ((prevState: S) => S);
export type UseSetState<T> = (initialState: T) => void;
export declare function useState<S = undefined>(): [
    Ref<S | undefined>,
    UseSetState<UseSetStateAction<S | undefined>>
];
export declare function useState<S>(initialState: S): [Ref<S>, UseSetState<UseSetStateAction<S>>];