import { Client } from 'haystack-nclient';
import { HGrid, HRef, HList } from 'haystack-core';
/**
 * The grid result.
 */
export interface GridResult {
    /**
     * The grid result.
     */
    grid: HGrid;
    /**
     * True if the grid's data is loading.
     */
    isLoading: boolean;
    /**
     * The number of times a grid has been loaded.
     */
    loads: number;
    /**
     * Truthy if the grid's data didn't load properly and threw an error.
     */
    error?: Error;
}
/**
 * A grid result that can be refreshed.
 */
export interface GridRefreshResult extends GridResult {
    /**
     * Called to refresh any backing data queries.
     */
    refresh: () => void;
}
/**
 * A hook that asynchronously resolves to a grid.
 *
 * @param options.getGrid An asynchronous method that resolves to a grid.
 * @param options.dependencies The dependencies that cause the grid to be refetched.
 * @returns A result that wraps the data.
 */
export declare function useGrid({ getGrid, dependencies, }: {
    getGrid: () => Promise<HGrid>;
    dependencies: ReadonlyArray<unknown>;
}): GridResult;
/**
 * The client context to be used.
 */
export declare const ClientContext: import("react").Context<Client>;
/**
 * @returns The client to use for network communication.
 */
export declare function useClient(): Client;
/**
 * A hook that restricts network communcations only to ops.
 */
export declare const OnlyOpsContext: import("react").Context<boolean>;
/**
 * @returns true if only ops should be used for network communication.
 */
export declare function useOnlyOps(): boolean;
/**
 * A hook that resolves a some ids into a grid.
 *
 * @param ids The ids to read from the server.
 * @returns A result that wraps the grid.
 */
export declare function useReadByIds(ids: string[] | HRef[] | HList<HRef>): GridRefreshResult;
/**
 * A hook that resolves an id into a grid.
 *
 * @param id The id to read to read from the server.
 * @returns A result that wraps the grid.
 */
export declare function useReadById(id: string | HRef): GridRefreshResult;
/**
 * A hook that resolves a haystack filter into a grid.
 *
 * @param filter The haystack filter to query from the server.
 * @returns A result that wraps the grid.
 */
export declare function useReadByFilter(filter: string): GridRefreshResult;
/**
 * A hook that responses an expression into a grid.
 *
 * @param expr The expression to evalulate.
 * @returns The result that wraps the grid.
 */
export declare function useEval(expr: string): GridRefreshResult;