import type { Accessor } from '../model';
/**
 * @param <S> The snapshot of the state.
 */
export interface AccessorOptions<S = any> {
    /**
     *  Whether the accessor should revalidate data when the user refocuses the page.
     */
    revalidateOnFocus?: boolean;
    /**
     * Whether the accessor should revalidate data when the user reconnects to the network.
     */
    revalidateOnReconnect?: boolean;
    /**
     * Whether it should revalidate when the `accessor` changes.
     */
    revalidateOnMount?: boolean;
    /**
     * Whether it should revalidate when the data, for which the `accessor` is responsible for fetching, is stale.
     */
    revalidateIfStale?: boolean;
    /**
     * A function to determine whether the returned data from the `getSnapshot` function is what you want. If it isn't, then it will revalidate.
     */
    checkHasData?: (snapshot: S) => boolean;
    /**
     * The number of retry attempts for errors.
     */
    retryCount?: number;
    /**
     * The interval in milliseconds between retry attempts for errors.
     */
    retryInterval?: number;
    /**
     * The time span in milliseconds to deduplicate requests with the same accessor.
     */
    dedupeInterval?: number;
    /**
     * The interval in milliseconds for polling data. If the value is less than or equal to 0, polling is disabled.
     */
    pollingInterval?: number;
    /**
     * Return the previous data until the new data has been fetched.
     */
    keepPreviousData?: boolean;
}
export type RequiredAccessorOptions<S = unknown> = Required<AccessorOptions<S>>;
export type UseAccessorReturn<S, E, ACC extends Accessor<any, any, E> | null> = {
    /**
     * Whether the accessor is currently fetching data.
     */
    readonly isFetching: boolean;
    /**
     * `true` if the `checkHasData` return `false` and the accessor is fetching data.
     */
    readonly isLoading: boolean;
    /**
     * The error thrown by the `fetchData` defined in the accessor. It is set when all retry attempts fail.
     */
    readonly error: E | null;
    /**
     * The snapshot returned by the `getSnapshot` function.
     */
    readonly data: S;
    /**
     * The accessor passed to the `useAccessor`.
     */
    accessor: ACC;
};