/**
 * SlackTransport — outbound via the Web API. Slack supports editing
 * (`chat.update`), so `edit-stream` gives a live-typing feel; no bot typing
 * indicator, so `typing+final` degrades to `final`. `target` is the channel id;
 * the message id used for edits is the message `ts`.
 */
import type { ChannelTransport } from '../delivery.js';
import type { SlackApi } from './api.js';
export declare class SlackTransport implements ChannelTransport {
    private readonly api;
    readonly maxChars = 3900;
    readonly supportsEdit = true;
    readonly supportsTyping = false;
    constructor(api: SlackApi);
    sendText(target: string, text: string): Promise<string | undefined>;
    editText(target: string, messageId: string, text: string): Promise<void>;
    sendTyping(): Promise<void>;
}
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