/**
 * @module
 * Deno socket adapter for SMTP connections via Deno.connect and Deno.startTls.
 *
 * @example
 * ```ts
 * import { DenoAdapter } from "sently/adapters/deno";
 * import { createSMTPMailer } from "sently/smtp";
 *
 * const mailer = await createSMTPMailer({
 *   host: "smtp.example.com",
 *   adapter: new DenoAdapter(),
 *   auth: { user: "you@example.com", pass: "secret" },
 * });
 * ```
 */
import type { SocketAdapter, TLSOptions } from "../core/types.js";
/** Configuration options for {@link DenoAdapter}. */
export interface DenoAdapterOptions {
    /** Use implicit TLS on connect (port 465). Default: false. */
    secure?: boolean;
    /** Socket connect timeout in milliseconds. Default: 30_000. */
    connectionTimeout?: number;
    /** TLS options passed to Deno.startTls / Deno.connectTls. */
    tls?: TLSOptions;
}
/**
 * Deno socket adapter using Deno.connect / Deno.startTls.
 */
export declare class DenoAdapter implements SocketAdapter {
    /** Active Deno TCP or TLS connection. */
    private conn;
    /** Whether the connection is currently encrypted. */
    private _secure;
    /** Whether the socket is connected. */
    private _connected;
    /** TLS options for direct TLS and STARTTLS upgrades. */
    private readonly tlsOptions;
    /** Creates a Deno socket adapter (requires the Deno runtime). */
    constructor(options?: DenoAdapterOptions);
    /** Whether the connection uses TLS. */
    get secure(): boolean;
    /** Whether the socket is currently connected. */
    get connected(): boolean;
    /** Opens a TCP or TLS connection to the given host and port. */
    connect(host: string, port: number): Promise<void>;
    /** Upgrades a plain connection to TLS via STARTTLS. */
    startTLS(options?: TLSOptions): Promise<void>;
    /** Writes raw bytes to the socket. */
    write(data: Uint8Array): Promise<void>;
    /** Reads incoming socket data as an async iterable of byte chunks. */
    read(): AsyncGenerator<Uint8Array, void, unknown>;
    /** Closes the socket connection. */
    close(): Promise<void>;
}