export declare class FMPClient {
    private readonly apiKey?;
    private readonly baseUrl;
    private readonly client;
    private static getErrorMessage;
    constructor(apiKey?: string);
    private getApiKey;
    protected get<T>(endpoint: string, params?: Record<string, any>, options?: {
        signal?: AbortSignal;
        context?: {
            config?: {
                FMP_ACCESS_TOKEN?: string;
            };
        };
    }): Promise<T>;
    protected getCSV(endpoint: string, params?: Record<string, any>, options?: {
        signal?: AbortSignal;
        context?: {
            config?: {
                FMP_ACCESS_TOKEN?: string;
            };
        };
    }): Promise<string>;
    protected post<T>(endpoint: string, data: any, params?: Record<string, any>, options?: {
        signal?: AbortSignal;
        context?: {
            config?: {
                FMP_ACCESS_TOKEN?: string;
            };
        };
    }): Promise<T>;
}