fix crashes during SSR

Author: RJWadley

src/Viewport.ts

@@ -112,8 +112,8 @@ export interface IViewportTransformState
 }
 
 const DEFAULT_VIEWPORT_OPTIONS: Partial<ICompleteViewportOptions> = {
-    screenWidth: window.innerWidth,
-    screenHeight: window.innerHeight,
+    screenWidth: typeof window === 'undefined' ? 0 : window.innerWidth,
+    screenHeight: typeof window === 'undefined' ? 0 : window.innerHeight,
     worldWidth: null,
     worldHeight: null,
     threshold: 5,
@@ -326,8 +326,8 @@ export class Viewport extends Container
      * @param {number} [worldHeight]
      */
     resize(
-        screenWidth: number = window.innerWidth,
-        screenHeight: number = window.innerHeight,
+        screenWidth: number = typeof window === 'undefined' ? 0 : window.innerWidth,
+        screenHeight: number = typeof window === 'undefined' ? 0 : window.innerHeight,
         worldWidth?: number,
         worldHeight?: number
     ): void

src/plugins/Drag.ts

@@ -212,12 +212,14 @@ export class Drag extends Plugin
 
     private addWindowEventHandler(event: string, handler: (e: any) => void): void
     {
+        if (typeof window === 'undefined') return;
         window.addEventListener(event, handler);
         this.windowEventHandlers.push({ event, handler });
     }
 
     public override destroy(): void
     {
+        if (typeof window === 'undefined') return;
         this.windowEventHandlers.forEach(({ event, handler }) =>
         {
             window.removeEventListener(event, handler);

src/plugins/Wheel.ts

@@ -125,6 +125,7 @@ export class Wheel extends Plugin
      */
     protected handleKeyPresses(codes: string[]): void
     {
+        if (typeof window === 'undefined') return;
         window.addEventListener('keydown', (e) =>
         {
             if (codes.includes(e.code))