import { Pool, ClientBase, QueryResult, QueryConfig } from "pg";
import DataLoader from "dataloader";
import { StrategyCollection } from "./StrategyCollection";
export declare class DataLoaderExecutor<T extends ClientBase | Pool = ClientBase | Pool> {
    connection: T;
    readonly strategies: StrategyCollection;
    constructor(connection: T, strategies: StrategyCollection);
}
export declare type ReadonlyDataLoaderExecutor<T extends ClientBase | Pool = ClientBase | Pool> = DataLoaderExecutor<T> & {
    readonly connection: T;
};
export declare type Reader<M> = (executor: DataLoaderExecutor, ids: readonly string[]) => Promise<M[]>;
export declare class DataLoaderCache<M extends {
    id: string;
}> {
    private _map;
    private readonly _read;
    constructor(read: Reader<M>);
    get(executor: DataLoaderExecutor): DataLoader<string, M>;
}
export declare class QueryCache<T> {
    private _map;
    query(tx: Pool | ClientBase | DataLoaderExecutor, query: string | QueryConfig<unknown[]>, parameters: unknown[]): Promise<QueryResult<T>>;
}