clean up serializer code

src/collision/shape/BoxShape.ts

@@ -33,6 +33,7 @@ import { PolygonShape } from './PolygonShape';
  * A rectangle polygon which extend PolygonShape.
  */
 export class BoxShape extends PolygonShape {
+  // note that box is serialized/deserialized as polygon
   static TYPE = 'polygon' as const;
 
   constructor(hx: number, hy: number, center?: Vec2Value, angle?: number) {

src/serializer/__test__/Serialize.test.ts

@@ -1,4 +1,4 @@
-// import { util } from 'util';
+// import util from 'util';
 import { describe, it, expect } from 'vitest';
 
 import { Vec2 } from '../../common/Vec2';
@@ -7,24 +7,24 @@ import { BoxShape } from '../../collision/shape/BoxShape';
 import { DistanceJoint } from '../../dynamics/joint/DistanceJoint';
 import { World } from '../../dynamics/World';
 
-import { Serializer } from '../../serializer';
+import { Serializer } from '../../serializer/index';
 
 describe('Serializer', function(): void {
   it('saves and loads to JSON', function(): void {
 
-    var world = new World();
+    const world = new World();
 
-    var circle = new CircleShape(1);
-    var box = new BoxShape(1, 1);
+    const circle = new CircleShape(1);
+    const box = new BoxShape(1, 1);
 
-    var b1 = world.createBody({
+    const b1 = world.createBody({
       position : new Vec2(0, 0),
       type : 'dynamic'
     });
 
     b1.createFixture(circle);
 
-    var b2 = world.createBody({
+    const b2 = world.createBody({
       position : new Vec2(2, 0),
       type : 'dynamic'
     });
@@ -37,16 +37,15 @@ describe('Serializer', function(): void {
       localAnchorB: new Vec2(0, -1)
     }));
 
-    var json = Serializer.toJson(world);
-    var text = JSON.stringify(json, null, ' ');
-    // console.log(util.inspect(json, false, null, true));
+    const json1 = Serializer.toJson(world);
+    const text1 = JSON.stringify(json1, null, ' ');
 
-    world = Serializer.fromJson(json);
-    var json2 = Serializer.toJson(world);
+    const world2 = Serializer.fromJson(json1);
+    const json2 = Serializer.toJson(world2);
 
-    var text2 = JSON.stringify(json, null, ' ');
+    const text2 = JSON.stringify(json2, null, ' ');
 
-    expect(json).to.deep.equal(json2);
-    expect(text.split('\n')).to.deep.equal(text2.split('\n'));
+    expect(json1).to.deep.equal(json2);
+    expect(text1.split('\n')).to.deep.equal(text2.split('\n'));
   });
 });