import { HttpClient } from "./http-client";
import type { OmnisendOptions } from "./types";
export declare class OmnisendCore<S extends true | false> {
    /**
     * The http client instance
     */
    protected httpClient: HttpClient<unknown, S>;
    /**
     * The Omnisend API Key
     */
    private apiKey;
    /**
     * Debug flag
     */
    private debug;
    constructor(options: OmnisendOptions<S>);
    /**
     * Logger for debug mode
     */
    private log;
}