import { MessageBus } from './message-bus.service';
/**
 * Manages the lifecycle of this workbench application module to communicate with the workbench application platform.
 */
export declare class PlatformActivator {
    /**
     * Starts this module to communicate with workbench application platform.
     *
     * Optionally, you can provide a custom {MessageBus} implementation used for communication with workbench application platform.
     * Default message bus communication is based on `postMessage` and `onmessage` to safely communicate cross-origin with the window parent.
     */
    static start(messageBus?: MessageBus): void;
    /**
     * Stops this module and releases resources allocated.
     */
    static stop(): void;
}