Use try/catch instead of checking if element is registered

Author: manuelpuyol

src/register.ts

@@ -12,10 +12,13 @@ export function register(classObject: CustomElement): void {
     .replace(/([A-Z]($|[a-z]))/g, '-$1')
     .replace(/(^-|-Element$)/g, '')
     .toLowerCase()
-  if (!window.customElements.get(name)) {
+
+  try {
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore
     window[classObject.name] = classObject
     window.customElements.define(name, classObject)
+  } catch {
+    // silently ignore
   }
 }