Review code format fixes

src/components/Output/custom-els/TwoUp/index.ts

@@ -42,7 +42,7 @@ export default class TwoUp extends HTMLElement {
       .observe(this, { childList: true });
 
     // Watch for element size changes.
-    if (window.hasOwnProperty('ResizeObserver')) {
+    if ('ResizeObserver' in window) {
       new ResizeObserver(() => this._resetPosition())
         .observe(this);
     } else {

src/components/Output/custom-els/TwoUp/missing-types.d.ts

@@ -31,7 +31,6 @@ interface DOMRectReadOnly {
   readonly left: number;
 }
 
-declare global {
 interface ResizeObserverCallback {
   (entries: ResizeObserverEntry[], observer: ResizeObserver): void;
 }
@@ -46,7 +45,6 @@ declare global {
   unobserve(target: Element): void;
   disconnect(): void;
 }
-}
 
 declare var ResizeObserver: {
   prototype: ResizeObserver;