fix some ts errors

engine/structures/Grid.ts

@@ -1,5 +1,5 @@
 import type { Coord2D, Dimension2D } from "../interfaces";
-import type { RefreshingCollisionFinderBehavior } from ".";
+import type { BoxedEntry, RefreshingCollisionFinderBehavior } from ".";
 
 export class Grid implements RefreshingCollisionFinderBehavior {
   private cellEntities: Map<number, string[]>;
@@ -11,7 +11,7 @@ export class Grid implements RefreshingCollisionFinderBehavior {
   constructor(
     gridDimension: Dimension2D,
     cellDimension: Dimension2D,
-    topLeft = { x: 0, y: 0 },
+    topLeft = { x: 0, y: 0 }
   ) {
     this.gridDimension = gridDimension;
     this.cellDimension = cellDimension;
@@ -25,7 +25,7 @@ export class Grid implements RefreshingCollisionFinderBehavior {
       if (!this.cellEntities.has(gridIdx)) {
         this.cellEntities.set(gridIdx, []);
       }
-      this.cellEntities.get(gridIdx).push(boxedEntry.id);
+      this.cellEntities.get(gridIdx)!.push(boxedEntry.id);
     });
   }
 
@@ -33,7 +33,7 @@ export class Grid implements RefreshingCollisionFinderBehavior {
     const neighborIds: Set<string> = new Set();
     this.getOverlappingCells(boxedEntry).forEach((gridIdx) => {
       if (this.cellEntities.has(gridIdx)) {
-        this.cellEntities.get(gridIdx).forEach((id) => neighborIds.add(id));
+        this.cellEntities.get(gridIdx)!.forEach((id) => neighborIds.add(id));
       }
     });
     return neighborIds;
@@ -58,10 +58,10 @@ export class Grid implements RefreshingCollisionFinderBehavior {
   private getOverlappingCells(boxedEntry: BoxedEntry): number[] {
     const { center, dimension } = boxedEntry;
     const yBoxes = Math.ceil(
-      this.gridDimension.height / this.cellDimension.height,
+      this.gridDimension.height / this.cellDimension.height
     );
     const xBoxes = Math.ceil(
-      this.gridDimension.width / this.cellDimension.width,
+      this.gridDimension.width / this.cellDimension.width
     );
 
     const translated: Coord2D = {
@@ -71,18 +71,18 @@ export class Grid implements RefreshingCollisionFinderBehavior {
 
     const topLeftBox = {
       x: Math.floor(
-        (translated.x - dimension.width / 2) / this.cellDimension.width,
+        (translated.x - dimension.width / 2) / this.cellDimension.width
       ),
       y: Math.floor(
-        (translated.y - dimension.height / 2) / this.cellDimension.height,
+        (translated.y - dimension.height / 2) / this.cellDimension.height
       ),
     };
     const bottomRightBox = {
       x: Math.floor(
-        (translated.x + dimension.width / 2) / this.cellDimension.width,
+        (translated.x + dimension.width / 2) / this.cellDimension.width
       ),
       y: Math.floor(
-        (translated.y + dimension.height / 2) / this.cellDimension.height,
+        (translated.y + dimension.height / 2) / this.cellDimension.height
       ),
     };
 

engine/structures/QuadTree.ts

@@ -30,7 +30,7 @@ export class QuadTree implements RefreshingCollisionFinderBehavior {
     dimension: Dimension2D,
     maxLevels: number = QuadTree.QUADTREE_MAX_LEVELS,
     splitThreshold: number = QuadTree.QUADTREE_SPLIT_THRESHOLD,
-    level: number = 0,
+    level: number = 0
   ) {
     this.children = new Map<Quadrant, QuadTree>();
     this.objects = [];
@@ -74,9 +74,9 @@ export class QuadTree implements RefreshingCollisionFinderBehavior {
     }
   }
 
-  public getNeighborIds(boxedEntry: BoxedEntry): string[] {
+  public getNeighborIds(boxedEntry: BoxedEntry): Set<string> {
     const neighbors = new Set<string>(
-      this.objects.map(({ id }) => id).filter((id) => id != boxedEntry.id),
+      this.objects.map(({ id }) => id).filter((id) => id != boxedEntry.id)
     );
 
     if (this.hasChildren()) {
@@ -104,7 +104,7 @@ export class QuadTree implements RefreshingCollisionFinderBehavior {
           Quadrant.IV,
           { x: this.topLeft.x + halfWidth, y: this.topLeft.y + halfHeight },
         ],
-      ] as [[Quadrant, Coord2D]]
+      ] as [Quadrant, Coord2D][]
     ).forEach(([quadrant, pos]) => {
       this.children.set(
         quadrant,
@@ -113,8 +113,8 @@ export class QuadTree implements RefreshingCollisionFinderBehavior {
           { width: halfWidth, height: halfHeight },
           this.maxLevels,
           this.splitThreshold,
-          this.level + 1,
+          this.level + 1
-        ),
+        )
       );
     });
   }
@@ -143,18 +143,18 @@ export class QuadTree implements RefreshingCollisionFinderBehavior {
           Quadrant.IV,
           (x: number, y: number) => x >= treeCenter.x && y >= treeCenter.y,
         ],
-      ] as [[Quadrant, (x: number, y: number) => boolean]]
+      ] as [Quadrant, (x: number, y: number) => boolean][]
     )
       .filter(
         ([_quadrant, condition]) =>
           condition(
             boxedEntry.center.x + boxedEntry.dimension.width / 2,
-            boxedEntry.center.y + boxedEntry.dimension.height / 2,
+            boxedEntry.center.y + boxedEntry.dimension.height / 2
           ) ||
           condition(
             boxedEntry.center.x - boxedEntry.dimension.width / 2,
-            boxedEntry.center.y - boxedEntry.dimension.height / 2,
+            boxedEntry.center.y - boxedEntry.dimension.height / 2
-          ),
+          )
       )
       .map(([quadrant]) => quadrant);
   }