diff --git a/__test__/Geometry/__snapshots__/simplify.test.ts.snap b/__test__/Geometry/__snapshots__/simplify.test.ts.snap
new file mode 100644
index 000000000..d56da69d2
--- /dev/null
+++ b/__test__/Geometry/__snapshots__/simplify.test.ts.snap
@@ -0,0 +1,22 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`路径简化 1`] = `
+Array [
+  Vector2 {
+    "x": 0,
+    "y": 0,
+  },
+  Vector2 {
+    "x": 10,
+    "y": 0,
+  },
+  Vector2 {
+    "x": 18,
+    "y": 6,
+  },
+  Vector2 {
+    "x": 28.3,
+    "y": 6,
+  },
+]
+`;
diff --git a/__test__/Geometry/boxExt.test.ts b/__test__/Geometry/boxExt.test.ts
index 84ae4bab5..ee3c802ef 100644
--- a/__test__/Geometry/boxExt.test.ts
+++ b/__test__/Geometry/boxExt.test.ts
@@ -9,6 +9,5 @@ test('盒子相减', () =>
     let b2 = new Box3Ext(new Vector3(200, 0, 0), new Vector3(205, 10, 300));
 
     let bs = b.substract(b2, 0);
-
-    expect(bs.length).toBe(0);
+    expect(bs.length).toBe(1);
 });
diff --git a/package.json b/package.json
index afefec750..38aa67de2 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
   },
   "jest": {
     "transform": {
-      ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+      ".(ts|tsx)": "ts-jest"
     },
     "testRegex": "(/__test__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
     "moduleFileExtensions": [
diff --git a/src/Common/FileSystem.ts b/src/Common/FileSystem.ts
index d447f6f9f..7ad98c3ff 100644
--- a/src/Common/FileSystem.ts
+++ b/src/Common/FileSystem.ts
@@ -1,5 +1,6 @@
 import { ArraybufferUtils } from "./binary/ArraybufferUtils";
 import { Base64Utils } from './binary/Base64Utils';
+import { BufferUtils } from "./binary/BufferUtils";
 
 /**
  * FileSystem is used to read and write files using nunuStudio.
diff --git a/src/Common/binary/ArraybufferUtils.js b/src/Common/binary/ArraybufferUtils.ts
similarity index 99%
rename from src/Common/binary/ArraybufferUtils.js
rename to src/Common/binary/ArraybufferUtils.ts
index 9622372b2..e48822861 100644
--- a/src/Common/binary/ArraybufferUtils.js
+++ b/src/Common/binary/ArraybufferUtils.ts
@@ -1,6 +1,3 @@
-"use strict";
-
-
 /**
  * ArraybufferUtils contains methods to convert from and to ArrayBuffer binary format
  * 
diff --git a/src/Common/binary/BufferUtils.js b/src/Common/binary/BufferUtils.js
deleted file mode 100644
index 6d2b814b7..000000000
--- a/src/Common/binary/BufferUtils.js
+++ /dev/null
@@ -1,30 +0,0 @@
-"use strict";
-
-/**
- * BufferUtils contains methods to convert from and to Node.js Buffer binary format
- * 
- * @class BufferUtils
- * @module BinaryUtils
- * @static
- */
-function BufferUtils(){}
-
-/**
- * Create nodejs buffer from arraybuffer
- *
- * @method fromArrayBuffer
- * @param {Arraybuffer} array
- * @return {Buffer} buffer
- */
-BufferUtils.fromArrayBuffer = function(array)
-{
-	var buffer = new Buffer(array.byteLength);
-	var view = new Uint8Array(array);
-	
-	for(var i = 0; i < buffer.length; i++)
-	{
-		buffer[i] = view[i];
-	}
-
-	return buffer;
-};
diff --git a/src/Common/binary/BufferUtils.ts b/src/Common/binary/BufferUtils.ts
new file mode 100644
index 000000000..86c122104
--- /dev/null
+++ b/src/Common/binary/BufferUtils.ts
@@ -0,0 +1,30 @@
+/**
+ * BufferUtils contains methods to convert from and to Node.js Buffer binary format
+ * 
+ * @class BufferUtils
+ * @module BinaryUtils
+ * @static
+ */
+export class BufferUtils
+{
+	/**
+     * Create nodejs buffer from arraybuffer
+     *
+     * @method fromArrayBuffer
+     * @param {Arraybuffer} array
+     * @return {Buffer} buffer
+     */
+	static fromArrayBuffer = array =>
+	{
+		const buffer = new Buffer(array.byteLength);
+		const view = new Uint8Array(array);
+
+		for (let i = 0; i < buffer.length; i++)
+		{
+			buffer[i] = view[i];
+		}
+
+		return buffer;
+	};
+
+}
diff --git a/tsconfig.json b/tsconfig.json
index 92e3dcf59..9fbcb73ef 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,6 @@
     "compilerOptions": {
         "sourceMap": true,
         "module": "commonjs",
-        "allowJs": true,
         "target": "esnext",
         "noLib": false,
         "moduleResolution": "node",
@@ -14,13 +13,13 @@
         "types": [
             "node",
             "webpack-env",
-            "webpack-dev-server"
+            "webpack-dev-server",
+            "jest"
         ],
         "jsx": "react",
         "experimentalDecorators": true
     },
     "include": [
         "./src/**/*",
-        "./config/**/*",
     ]
 }