/**
 * Slack Web API transport for managed channel egress.
 *
 * Uses `fetch` against `https://slack.com/api/*` — no Slack SDK dependency.
 * Credentials stay in process env / constructor args; they never appear on
 * `runtime.channel`.
 */
import type { ChannelTransport } from "../runtime.js";
/** Optional override so tests can point at a local mock Slack Web API. */
export declare const SLACK_API_BASE_ENV = "SLACK_API_BASE";
/** Default status string for Slack Assistants `assistant.threads.setStatus`. */
export declare const DEFAULT_ASSISTANT_STATUS = "is thinking\u2026";
/**
 * Curated rotating loading strings shown by Slack while the indicator is active.
 * Capped at 10 by Slack's API.
 */
export declare const DEFAULT_LOADING_MESSAGES: readonly string[];
export interface SlackWebApiTransportOptions {
    botToken: string;
    /** Slack Web API base URL (default `https://slack.com/api`). */
    apiBase?: string;
    /** Optional fetch override for tests. */
    fetch?: typeof fetch;
}
export interface SetSlackAssistantStatusOptions {
    botToken: string;
    channelId: string;
    threadTs: string;
    /** Status text; empty string clears the indicator. */
    status?: string;
    loadingMessages?: readonly string[];
    apiBase?: string;
    fetch?: typeof fetch;
}
/**
 * Build a {@link ChannelTransport} backed by Slack `chat.postMessage` /
 * `chat.update`.
 */
export declare function createSlackWebApiTransport(options: SlackWebApiTransportOptions): ChannelTransport;
/**
 * Set (or clear) Slack's Assistants thread status indicator.
 *
 * Wraps `assistant.threads.setStatus`. Failures are logged and never thrown —
 * the indicator is a UX nicety, not a correctness requirement. Returns whether
 * Slack accepted the update.
 */
export declare function setSlackAssistantStatus(options: SetSlackAssistantStatusOptions): Promise<boolean>;
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