refactor: inline fromJSON for resources

packages/resource/index.js

@@ -12,8 +12,7 @@ export class Resource extends decorate(class {}) {
 
   static load(uri) {
     return this.read(uri).then((json) => {
-      const instance = new this();
-      return instance.fromJSON(json);
+      return new this(json);
     });
   }
 

packages/sound/index.js

@@ -19,8 +19,7 @@ export class Sound extends Resource {
       return this.loadCache[uri];
     }
     return this.loadCache[uri] = this.read(uri).then((json) => {
-      const instance = new this();
-      instance.fromJSON(json);
+      const instance = new Sound(json);
       let lastTime = performance.now();
       instance.tickHandle = setInterval(() => {
         const now = performance.now();
@@ -36,7 +35,7 @@ export class Sound extends Resource {
     });
   }
 
-  constructor() {
+  constructor(json) {
     super();
     this.interval = 0;
     this.lastPlayHandle = undefined;
@@ -45,6 +44,9 @@ export class Sound extends Resource {
     this.remaining = 0;
     this.sound = undefined;
     this.tickHandle = undefined;
+    if ('undefined' !== typeof json) {
+      this.fromJSON(json);
+    }
   }
 
   destroy() {

packages/timing/animation.js

@@ -21,9 +21,12 @@ const decorate = compose(
 
 export class Animation extends decorate(Resource) {
 
-  constructor() {
+  constructor(json) {
     super();
     this.imageUri = undefined;
+    if ('undefined' !== typeof json) {
+      this.fromJSON(json);
+    }
   }
 
   get sourceRectangle() {

packages/topdown/tileset.js

@@ -16,10 +16,13 @@ const decorate = compose(
 
 export class Tileset extends decorate(Resource) {
 
-  constructor() {
+  constructor(json) {
     super();
     this._geometry = {};
     this.subimages = [];
+    if ('undefined' !== typeof json) {
+      this.fromJSON(json);
+    }
   }
 
   destroy() {