import DataLoader from 'dataloader';
import { DBProvider } from '../../app-providers/db.provider.js';
import type { IGetExchangeRatesByDateResult, IGetExchangeRatesByDatesResult } from '../types.js';
export declare class FiatExchangeProvider {
    private dbProvider;
    cache: {
        get: <T>(key: import("node-cache").Key) => T | undefined;
        set: {
            <T>(key: import("node-cache").Key, value: T, ttl: number | string): boolean;
            <T>(key: import("node-cache").Key, value: T): boolean;
        };
        delete: (keys: import("node-cache").Key | import("node-cache").Key[]) => number;
        clear: () => void;
    };
    constructor(dbProvider: DBProvider);
    getExchangeRates(date: Date): Promise<IGetExchangeRatesByDateResult | IGetExchangeRatesByDateResult[]>;
    private batchExchangeRatesByDates;
    getExchangeRatesByDatesLoader: DataLoader<Date, IGetExchangeRatesByDatesResult, import("node-cache").Key | import("node-cache").Key[]>;
    clearCache(): void;
}