/**
 * This is a utility class for interacting with a framed document using `postMessage`.
 */
import { AlBehaviorPromise } from "../promises";
export declare class AlFrameMessageStream {
    frameURI: string;
    waitForMessage?: boolean;
    messagePrefix?: string;
    protected isReady: AlBehaviorPromise<boolean>;
    protected container: HTMLElement;
    protected handlers: {
        [messageType: string]: {
            (data: any, rawEvent?: any, stream?: AlFrameMessageStream): void;
        };
    };
    /**
     * Constructor
     *
     * @param frameURI: where the iframe should be pointed to
     * @param waitForMessage: if truthy, the `start()` method will not resolve until the first message is received from the frame.
     * @param messagePrefix: if provided, only messages whose bodies include a `type` property starting with this value will be handled.
     */
    constructor(frameURI: string, waitForMessage?: boolean, messagePrefix?: string);
    start(): Promise<void>;
    ready(): Promise<void>;
    stop(): void;
    on(messageType: string, handler: {
        (data: any, rawEvent?: any, stream?: AlFrameMessageStream): void;
    }): AlFrameMessageStream;
    private onReceiveMessage;
    private render;
}