/**
 * MHub Message class.
 */
/**
 * Headers are key-value pairs that carry meta-information
 * about a message.
 */
export interface Headers {
    [name: string]: string | boolean | number;
}
/**
 * Interface describing what a 'raw' object should look like
 * if it is to be converted to a Message using `Message.fromObject()`.
 */
export interface MessageLike {
    topic: string;
    data?: any;
    headers?: Headers;
}
/**
 * Message to be sent or received over MHub network.
 */
export declare class Message {
    /**
     * Create a Message object from a plain object, by taking its topic, data and
     * headers properties.
     *
     * Note that the data is not deep-cloned.
     *
     * @param o Input object. Must at least contain a `.topic` property.
     * @return New `Message` instance, with given topic, same data, and clone of headers.
     */
    static fromObject(o: MessageLike): Message;
    /**
     * Topic of message.
     * Can be used to determine routing between pubsub Nodes.
     */
    topic: string;
    /**
     * Optional message data, can be null.
     * Must be JSON serializable.
     */
    data: any;
    /**
     * Optional message headers.
     */
    headers: Headers;
    /**
     * Construct message object.
     *
     * Note: headers are cloned, but data is NOT cloned, so don't change data after you've
     * passed it to the pubsub framework!
     */
    constructor(topic: string, data?: any, headers?: Headers);
    /**
     * Perform a shallow clone of the message.
     *
     * I.e. the new message will share the same `data` as the source message,
     * so be careful when the data is an object: making changes to it will be
     * reflected in the old and new message.
     *
     * The headers (if any) are cloned into a new headers object.
     *
     * @return New message with same topic, same data and shallow clone of headers.
     */
    clone(): Message;
    /**
     * Validate correctness of message properties, e.g. that topic is a string,
     * and header is either undefined or key-values.
     */
    validate(): void;
}
export default Message;