/**
 * SmsTransport — outbound SMS via Twilio. SMS can't edit or show typing, so
 * every delivery mode degrades to `final`; long replies are chunked. The
 * shuttle's fixed Twilio number is the `from`; `target` is the customer's number.
 */
import type { ChannelTransport } from '../delivery.js';
import type { TwilioApi } from './api.js';
export declare class SmsTransport implements ChannelTransport {
    private readonly api;
    private readonly from;
    readonly maxChars = 1600;
    readonly supportsEdit = false;
    readonly supportsTyping = false;
    constructor(api: TwilioApi, from: string);
    sendText(target: string, text: string): Promise<string | undefined>;
    editText(): Promise<void>;
    sendTyping(): Promise<void>;
}
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