Dedup custom elements

dedup-custom-elements.js

let _define = customElements.define;
let registered = [];
customElements.define = function() {
	const componentName = arguments[0];

	if(registered.includes(componentName)) {
		console.error(`Trying to register ${componentName} more than once`);
		return;
	}

	registered.push(componentName);
	return _define.apply(this, arguments);
};

Use this to fix duplicate component errors:

(index):18 Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': this name has already been used with this registry
    at CustomElementRegistry.customElements.define