/**
 * Minimal Slack API client (fetch-based, zero deps): the Web API methods a
 * shuttle needs + Socket Mode connection open. Socket Mode means NO public
 * webhook / app review — the bot dials out over a WebSocket.
 */
export interface SlackApiOptions {
    /** Bot token `xoxb-…` (Web API calls). */
    readonly botToken: string;
    /** App-level token `xapp-…` (Socket Mode). */
    readonly appToken?: string;
    readonly fetch?: typeof fetch;
    readonly baseUrl?: string;
}
export declare class SlackApi {
    private readonly base;
    private readonly botToken;
    private readonly appToken;
    private readonly doFetch;
    constructor(opts: SlackApiOptions);
    private call;
    authTest(): Promise<{
        user_id: string;
        team_id: string;
    }>;
    openConnection(): Promise<{
        url: string;
    }>;
    postMessage(channel: string, text: string, opts?: {
        threadTs?: string;
    }): Promise<{
        ts: string;
    }>;
    updateMessage(channel: string, ts: string, text: string): Promise<{
        ts: string;
    }>;
}
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