export declare function originFromWidgetHost(widgetHost: string): string;
export declare function targetOriginForIframe(iframe: HTMLIFrameElement, widgetHost?: string): string;
export declare function registerIframe(iframe: HTMLIFrameElement, widgetHost: string): void;
export declare function unregisterIframe(iframe: HTMLIFrameElement): void;
/** Snapshot of currently registered agent iframes. */
export declare function getRegisteredIframes(): Array<{
    iframe: HTMLIFrameElement;
    widgetHost: string;
}>;
export declare function isRegisteredIframeSource(source: MessageEventSource | null): source is Window;
export declare function hasRegisteredIframeOrigin(origin: string): boolean;
/** @internal Test helper */
export declare function resetIframeRegistry(): void;