/**
 * Make sure channel is a public or private channel.
 * DMs are not supported right now.
 *
 * @param id channel ID
 * @return true if the channel is a public channel
 */
export declare function isChannel(id: string): boolean;
/**
 * Determine if the chat system is Slack.
 *
 * This is a simple implementation right now in order to add basic support
 * for Microsoft Teams. In future we prefer not to use the channel id
 * format to determine the chat system, but have Atomist provide us with the
 * type of chat system in the request message.
 *
 * @param id channel ID
 * @return true if the system is Slack
 */
export declare function isSlack(id: string): boolean;