import { SentlyError } from "../core/errors.js";
import type { MailOptions, SendResult, Transport, VerifyResult } from "../core/types.js";
/** Message shape accepted by the Cloudflare Workers `send_email` binding. */
export interface CloudflareEmailMessage {
    /** Envelope sender. */
    from: string;
    /** Primary recipient. */
    to: string;
    /** Message subject. */
    subject?: string;
    /** Reply-To address. */
    reply_to?: string;
    /** Carbon-copy recipients. */
    cc?: string[];
    /** Blind carbon-copy recipients. */
    bcc?: string[];
    /** Additional MIME headers. */
    headers?: Record<string, string>;
    /** Message body parts. */
    content: Array<{
        type: string;
        value: string;
    }>;
    /** Optional attachments (base64 content). */
    attachments?: Array<{
        disposition: "attachment" | "inline";
        filename: string;
        type: string;
        content: string;
    }>;
}
/** Callable Workers `send_email` binding. */
export type CloudflareSendEmailFn = (message: CloudflareEmailMessage) => Promise<void>;
/** Cloudflare Workers Email binding configuration. */
export interface CloudflareEmailConfig {
    /** The Workers `send_email` binding (e.g. `env.SEND_EMAIL`). */
    sendEmail: CloudflareSendEmailFn;
}
/** Error thrown when the Cloudflare Email binding rejects a send. */
export declare class CloudflareEmailError extends SentlyError {
    /** Creates a Cloudflare Email binding error. */
    constructor(message: string, cause?: unknown);
}
/**
 * Cloudflare Workers Email binding transport.
 */
export declare class CloudflareEmailTransport implements Transport {
    readonly provider = "cloudflare-email";
    private readonly sendEmail;
    /** Creates a transport backed by the Workers `send_email` binding. */
    constructor(config: CloudflareEmailConfig);
    /** Sends an email via the Workers `send_email` binding. */
    send(options: MailOptions): Promise<SendResult>;
    /**
     * Confirms the binding is configured — no network validation is available.
     */
    verify(): Promise<VerifyResult>;
}