/**
 * WhatsAppTransport — outbound via the Cloud API. WhatsApp text can't be edited
 * and (in v1) we don't drive typing, so delivery degrades to `final`; long
 * replies chunk at 4096. `target` is the customer's WhatsApp number.
 */
import type { ChannelTransport } from '../delivery.js';
import { type WhatsAppApi } from './api.js';
export interface WhatsAppSendObserver {
    prepare(target: string, text: string): Promise<string> | string;
    accepted(attemptId: string, providerMessageId: string): Promise<void> | void;
    rejected(attemptId: string, code: string): Promise<void> | void;
    unknown(attemptId: string, code: string): Promise<void> | void;
}
export declare class WhatsAppTransport implements ChannelTransport {
    private readonly api;
    readonly maxChars = 4096;
    readonly supportsEdit = false;
    readonly supportsTyping = false;
    private readonly observers;
    constructor(api: WhatsAppApi);
    withObserver<T>(observer: WhatsAppSendObserver | undefined, work: () => Promise<T>): Promise<T>;
    sendText(target: string, text: string): Promise<string | undefined>;
    editText(): Promise<void>;
    sendTyping(): Promise<void>;
}
//# sourceMappingURL=transport.d.ts.map