import type { DeepLResult } from "../types";
export declare class DeepL {
    private apiKey;
    private isPro;
    private headers;
    readonly url: string;
    readonly endpoints: {
        free: string;
        pro: string;
    };
    /**
     * Construcs a new instance of DeepL class
     * @param deepLKey: string - The user's DeepL authentication key
     * @param isPro (optional) - boolean. Specifies if the user is using the pro version api
     */
    constructor(deepLKey: string, isPro?: boolean);
    /**
     * Translate the given text fron one language to another
     * The input is an JavaScript Object
     * @param from (optional): string - Should be one of the supported language.
     * @param to: string - Should be one of the supported language.
     * @param text: string[] | string - The source text(s) to be translated.
     *
     * @returns A Promise that resolves to a DeepLResult containing the translation
     * @throws An error if the API request fails
     */
    translate({ from, to, text, }: {
        from?: string;
        to: string;
        text: string[] | string;
    }): Promise<DeepLResult>;
}