/**
 * emailSender.ts
 *
 * Sends transactional email via the Resend API using native fetch.
 * No extra SDK dependency — uses the same fetch-everywhere pattern as the
 * rest of the codebase.
 *
 * Required env var: RESEND_API_KEY
 * Optional env vars:
 *   DIGEST_FROM_EMAIL   (default: "digest@usebrains.app")
 *   DIGEST_FROM_NAME    (default: "brains Weekly Digest")
 */
export interface EmailPayload {
    to: string;
    subject: string;
    html: string;
    text: string;
}
export declare function sendDigestEmail(apiKey: string, fromEmail: string, fromName: string, payload: EmailPayload): Promise<void>;
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