import type { AnyMessage, IMessageValidator, IOwnMessageEvent } from './types';
export declare class MessageValidator implements IMessageValidator {
    protected acceptedSource: Window;
    protected acceptedOrigin: string;
    constructor(acceptedSource: Window, acceptedOrigin: string);
    /**
     * Validates the identity of the message's sender and the format of the message's data.
     *
     * Checks whether the remoteOrigin location matches any allowed origins.
     * Separate assertion of the remoteOrigin allows for cross-domain navigation
     * within this.frame, and still treating inbound messages from the
     * frame as being equal.
     *
     * Checks whether the source Window object equals the remoteWindow object.
     * This check allows for implementation of multiple i-frames that share the
     * same remoteOrigin, and still being able to distinguish between messages from
     * such frames.
     */
    validate(message: MessageEvent): message is IOwnMessageEvent<AnyMessage>;
    /**
     * Tests whether the data sent through postMessage is a well-formed message
     * object. This serves as runtime data format validation. If messages do not
     * comply to the AnyMessage compound interface, the entire event is ignored.
     *
     * @param {*} message
     * @return {boolean}
     */
    isWellFormedMessage(message: any): message is AnyMessage;
}