express-route.html

<script>
    class ExpressRouteComponent extends HTMLElement {
        constructor() {
            super();

            this.path = null;
        }

        static get observedAttributes() {
            return [
                'path'
            ];
        }

        attributeChangedCallback(name, oldValue, newValue) {
            switch (name) {
                case 'path': {
                    this.path = newValue;
                    break;
                }
            }
        }

        expressReadyCallback(app, express, router, route) {
            const parent = getParent(app, router);
            const newRoute = parent.route(this.path);

            this.route = newRoute;

            function getParent(app, router) {
                if (router) {
                    return router;
                }
                else {
                    return app;
                }
            }
        }
    }

    window.customElements.define('express-route', ExpressRoute);
</script>