How to use the post-robot/src.markWindowKnown function in post-robot

if (childPayload.version !== __ZOID__.__VERSION__) {
                throw new Error(`Parent window has zoid version ${ childPayload.version }, child window has version ${ __ZOID__.__VERSION__ }`);
            }

            const { parent, parentDomain, exports, context, props } = childPayload;

            this.context = context;
            this.parentComponentWindow = this.getParentComponentWindow(parent);
            this.parentDomain = parentDomain;
            this.parent = deserializeMessage(this.parentComponentWindow, parentDomain, exports);

            this.checkParentDomain(parentDomain);

            const initialProps = this.getPropsByRef(this.parentComponentWindow, parentDomain, props);
            this.setProps(initialProps, parentDomain);
            markWindowKnown(this.parentComponentWindow);
            
            this.watchForClose();

            return this.parent.init(this.buildExports());

        }).then(() => {
            return this.watchForResize();

parent = _parseChildWindowName.parent,
                domain = _parseChildWindowName.domain,
                exports = _parseChildWindowName.exports,
                context = _parseChildWindowName.context,
                props = _parseChildWindowName.props;

            _this.context = context;
            _this.parentComponentWindow = _this.getWindowByRef(parent);
            _this.parentExports = deserializeMessage(_this.parentComponentWindow, domain, exports);

            _this.checkParentDomain(domain);

            window.xchild = _this.component.xchild = _this;
            var initialProps = _this.getPropsByRef(_this.parentComponentWindow, domain, props);
            _this.setProps(initialProps, domain);
            markWindowKnown(_this.parentComponentWindow);

            _this.watchForClose();

            return _this.parentExports.init(_this.buildExports());
        }).then(function () {
            return _this.watchForResize();