/**
 * Sends a message to a Slack channel.
 *
 * @param channel - The channel to send the message to.
 * @param message - The message to send.
 * @param slackBotToken - The slack bot token to use. If not provided, the SLACK_BOT_TOKEN environment variable will be used.
 * @returns A promise that resolves to true if the message is sent successfully.
 * @throws {Error} If the Slack API request fails or returns an error status.
 */
export declare const sendMessageToSlack: (channel: string, message: string, slackBotToken?: string) => Promise<boolean>;