/**
 * Logging to slack
 */
export declare class Logger {
    accessToken: string;
    channel: string;
    /**
     * @param accessToken A oauth access token
     * @param channel A channel id
     */
    constructor(accessToken: string, channel: string);
    /**
     * Post message to `https://slack.com/api/chat.postMessage`
     */
    postMessage(json: object): Promise<void>;
    /**
     * Format value for the text param of chat.postMessage
     */
    formatValue(value: unknown): string;
    log(value: unknown): Promise<void>;
    info(value: unknown): Promise<void>;
    error(value: unknown): Promise<void>;
}