import { Parameter } from './interfaces/parameter';
export declare class Client {
    private readonly POKEMONTCG_API_BASE_URL;
    private readonly POKEMONTCG_API_VERSION;
    private readonly POKEMONTCG_API_URL;
    private readonly POKEMONTCG_API_KEY?;
    private static instance;
    private constructor();
    static getInstance(): Client;
    get<T>(resource: string, params?: Parameter | string): Promise<T>;
    private stringify;
}