refactor

frontend/src/desktop/DesktopWorkspace.tsx

@@ -419,14 +419,7 @@ const DesktopWorkspace: React.FC<DesktopWorkspaceProps> = ({
 
     commitSize();
 
-    if (typeof window.ResizeObserver === 'undefined') {
-      window.addEventListener('resize', commitSize);
-      return () => {
-        window.removeEventListener('resize', commitSize);
-      };
-    }
-
-    const observer = new window.ResizeObserver(commitSize);
+    const observer = new ResizeObserver(commitSize);
     observer.observe(container);
     return () => observer.disconnect();
   }, [engine]);

frontend/src/desktop/db.ts

@@ -10,13 +10,7 @@ const openDatabase = (): Promise<IDBDatabase> => {
   }
 
   currentDbPromise.value = new Promise((resolve, reject) => {
-    const dbApi = typeof window !== 'undefined' ? window.indexedDB : null;
-    if (!dbApi) {
-      reject(new Error('IndexedDB not available'));
-      return;
-    }
-
-    const request = dbApi.open(DB_NAME, DB_VERSION);
+    const request = window.indexedDB.open(DB_NAME, DB_VERSION);
 
     request.onupgradeneeded = () => {
       const db = request.result;

frontend/src/desktop/tags/useDeskTagInteractions.js

@@ -141,7 +141,7 @@ export const useDeskTagInteractions = ({
 
       const { x: pointerX, y: pointerY } = getPointerPosition(event, { fallbackToPage: false });
       const { clone, offsetX, offsetY } = createDragPreview(event.currentTarget, pointerX, pointerY) || {};
-      if (clone && typeof event.dataTransfer.setDragImage === 'function') {
+      if (clone) {
         event.dataTransfer.setDragImage(clone, offsetX || 0, offsetY || 0);
       }
 

frontend/src/desktop/useDocumentDrag.ts

@@ -165,13 +165,9 @@ const getEventTargetElement = (event?: PointerEventLike | null): Element | null
   if (!event) {
     return null;
   }
-  const ElementCtor = typeof window !== 'undefined' ? window.Element : null;
-  if (!ElementCtor) {
-    return null;
-  }
   const nativeEvent = 'nativeEvent' in event ? (event as ReactPointerEvent).nativeEvent : null;
   const candidate = (event.target as Element | null) || (nativeEvent ? (nativeEvent.target as Element | null) : null);
-  return candidate instanceof ElementCtor ? candidate : null;
+  return candidate instanceof Element ? candidate : null;
 };
 
 const useDocumentDrag = (options: UseDocumentDragOptions) => {

frontend/src/desktop/workspaceEngine.ts

@@ -618,7 +618,7 @@ export class WorkspaceEngine {
 
   updateConfig({ allowLayoutPersistence, tenantId, viewId }: WorkspaceEngineOptions): void {
     const allowChanged =
-      typeof allowLayoutPersistence === 'boolean'
+      allowLayoutPersistence !== undefined
       && allowLayoutPersistence !== this.allowLayoutPersistence;
     const tenantChanged = tenantId !== undefined && tenantId !== this.tenantId;
     const viewChanged = viewId !== undefined && viewId !== this.viewId;
@@ -682,15 +682,11 @@ export class WorkspaceEngine {
   }
 
   setEnsureDocumentSize(fn: EnsureDocumentSize): void {
-    if (typeof fn === 'function') {
-      this.ensureDocumentSize = fn;
-    }
+    this.ensureDocumentSize = fn;
   }
 
   setResolveBaseMetrics(fn: ResolveBaseMetrics): void {
-    if (typeof fn === 'function') {
-      this.resolveBaseMetrics = fn;
-    }
+    this.resolveBaseMetrics = fn;
   }
 
   setItemRefs(ref: ItemRefs | null | undefined): void {
@@ -782,18 +778,14 @@ export class WorkspaceEngine {
 
   updateLayoutEntry(
     docId: string | number | null,
-    updater:
-      | LayoutEntry
-      | null
-      | undefined
-      | ((previous: LayoutEntry | null) => LayoutEntry | null | undefined),
+    updater: (previous: LayoutEntry | null) => LayoutEntry | null | undefined,
   ): void {
     if (docId == null) {
       return;
     }
     const key = String(docId);
     const previous = this.layout.get(key) || null;
-    const next = typeof updater === 'function' ? updater(previous) : updater;
+    const next = updater(previous);
     if (!next) {
       this.layout.delete(key);
     } else {
@@ -939,7 +931,9 @@ export class WorkspaceEngine {
     let angularVelocity = simulationState.angularVelocity + torqueAcceleration * dt;
     angularVelocity = clamp(angularVelocity, -MAX_ANGULAR_VELOCITY, MAX_ANGULAR_VELOCITY);
 
-    const dampingConstant = typeof dampingOverride === 'number' ? dampingOverride : ANGULAR_DAMPING;
+    const dampingConstant = Number.isFinite(dampingOverride)
+      ? Number(dampingOverride)
+      : ANGULAR_DAMPING;
     const dampingFactor = Math.exp(-dampingConstant * dt);
     angularVelocity *= dampingFactor;
 
@@ -1154,8 +1148,12 @@ export class WorkspaceEngine {
       if (existing) {
         const defaultCenterX = (minCenterX + maxCenterX) / 2;
         const defaultCenterY = (minCenterY + maxCenterY) / 2;
-        const prevCenterX = typeof existing.centerX === 'number' ? existing.centerX : defaultCenterX;
-        const prevCenterY = typeof existing.centerY === 'number' ? existing.centerY : defaultCenterY;
+        const prevCenterX = Number.isFinite(existing.centerX)
+          ? Number(existing.centerX)
+          : defaultCenterX;
+        const prevCenterY = Number.isFinite(existing.centerY)
+          ? Number(existing.centerY)
+          : defaultCenterY;
         const centerX = clamp(prevCenterX, minCenterX, maxCenterX);
         const centerY = clamp(prevCenterY, minCenterY, maxCenterY);
         const rotation = existing.rotation ?? 0;
@@ -1201,9 +1199,6 @@ export class WorkspaceEngine {
 
   recalcVisibleDocIds(): void {
     const ensureSize = this.ensureDocumentSize;
-    if (typeof ensureSize !== 'function') {
-      return;
-    }
 
     const layoutMap = this.layout;
     const canvasWidth = this.canvasSize.width || DESK_DEFAULT_CANVAS_WIDTH;
@@ -1418,7 +1413,7 @@ export const useWorkspaceSnapshot = (
   useSyncExternalStoreHook: UseSyncExternalStoreHook,
 ): WorkspaceSnapshot => {
   const useSyncExternalStore = useSyncExternalStoreHook;
-  if (typeof useSyncExternalStore !== 'function') {
+  if (!useSyncExternalStore) {
     throw new Error('useWorkspaceSnapshot requires useSyncExternalStore hook');
   }
   return useSyncExternalStore(