/**
 * Dispatcher that can post messages across process boundaries.
 */
export interface IDispatcher {
    /**
     * Posts a message to the target process.
     * @param message The message object.
     * @param targetOrigin The target origin, or "*" if any origin is allowed.
     */
    postMessage(message: unknown, targetOrigin: string): void;
}
/**
 * Handler that processes the incoming messages.
 */
export interface IMessageHandler {
    /**
     * Handles an event.
     * @param dispatcher The event source dispatcher.
     * @param origin The event source origin.
     * @param event The event identifier.
     * @param data The event data.
     */
    event?: (dispatcher: IDispatcher, origin: string, event: string, data: unknown) => void;
    /**
     * Handles an API request.
     * @param dispatcher The request source dispatcher.
     * @param origin The request source origin.
     * @param api The requested API entry point.
     * @param args The request arguments.
     * @returns A promise that resolves into a result, or nothing if the handler cannot handle the request.
     */
    request?: (dispatcher: IDispatcher, origin: string, api: string, args: unknown[]) => Promise<unknown> | undefined;
}
/**
 * Callback for stopping a listener.
 */
export declare type StopListening = () => void;
/**
 * Begins listening for incoming messages.
 * @param handler The message handler.
 * @returns A callback that stops the listener.
 */
export declare function listen(handler: IMessageHandler): StopListening;
/**
 * Sends a request through a dispatcher and returns a promise that resolves into a result.
 * @param dispatcher The dispatcher.
 * @param origin The expected target origin. Use "*" to allow any origin.
 * @param api The requested API entry point.
 * @param args The request arguments.
 * @param timeout The optional timeout in milliseconds. Zero disables the timeout completely.
 */
export declare function sendRequest(dispatcher: IDispatcher, origin: string, api: string, args: unknown[], timeout?: number): Promise<unknown>;
/**
 * Sends an event through the dispatcher.
 * @param dispatcher The dispatcher.
 * @param origin The expected target origin. Use "*" to allow any origin.
 * @param event The event identifier.
 * @param data The event data.
 */
export declare function sendEvent(dispatcher: IDispatcher, origin: string, event: string, data: unknown): void;
export declare function dispatcherEventListener(e: MessageEvent): Promise<void>;