cleanup

frontend/src/preview/useViewerLayoutMode.js

@@ -4,10 +4,6 @@ export const DOCUMENT_VIEWER_PORTRAIT_HEIGHT_RATIO = 0.4;
 const PORTRAIT_RATIO_STYLE_ID = 'document-viewer-portrait-ratio-style';
 
 const ensurePortraitRatioStyle = () => {
-  if (typeof document === 'undefined') {
-    return;
-  }
-
   const cssValue = String(DOCUMENT_VIEWER_PORTRAIT_HEIGHT_RATIO);
   const cssText = `:root { --document-viewer-portrait-height-ratio: ${cssValue}; }`;
 
@@ -23,12 +19,7 @@ const ensurePortraitRatioStyle = () => {
   }
 };
 
-const computeStackedLayoutBreakpoint = () => {
-  if (typeof window === 'undefined') {
-    return 900;
-  }
-  return window.innerWidth / 2;
-};
+const computeStackedLayoutBreakpoint = () => window.innerWidth / 2;
 
 export const useViewerLayoutMode = (ref, dependency) => {
   const [isStacked, setIsStacked] = useState(false);
@@ -61,7 +52,7 @@ export const useViewerLayoutMode = (ref, dependency) => {
 
     measure();
 
-    if (typeof ResizeObserver === 'undefined') {
+    if (!('ResizeObserver' in window)) {
       window.addEventListener('resize', measure);
       return () => {
         if (frame) {