import type { Auth } from './auth.js';
/**
 * App transactional email via the platform's Resend integration.
 *
 * Apps don't need their own email provider. The platform sends on behalf
 * of the app using the platform's Resend account.
 *
 * Rate limit: 100 emails/day per app (free tier).
 */
export declare class Email {
    private readonly appId;
    private readonly apiBase;
    private readonly auth;
    constructor(appId: string, apiBase: string, auth: Auth);
    /**
     * Send a transactional email.
     *
     * @param to - recipient email address
     * @param subject - email subject (max 200 chars, auto-prefixed with [appId])
     * @param opts - email body (at least one of html or text required)
     */
    send(to: string, subject: string, opts: {
        html?: string;
        text?: string;
    }): Promise<void>;
}
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