interface SubscribeData {
    email: string;
    [key: string]: string;
}
interface SubscribeConfig {
    publishKey: string;
    token?: string;
    sid?: string;
    f?: string;
}
export declare const API_BASE = "https://api.mailto.foo";
export declare class Mailto {
    private publishKey;
    private _sid?;
    private _hf?;
    constructor(config: SubscribeConfig);
    injectHoneypot(form: HTMLFormElement): Promise<void>;
    subscribe(data: SubscribeData): Promise<void>;
}
export {};