update

src/Buffer.js

@@ -1,18 +0,0 @@
-/* @flow */
-/* global Buffer */
-
-class Buffer { //eslint-disable-line no-unused-vars
-  i : number;
-  constructor () {
-    this.i = 4;
-  }
-}
-
-
-function add(x : string){
-  return x + 4;
-}
-
-
-add("5");
-add("6");

src/OperationBuffer.js

@@ -0,0 +1,8 @@
+/* @flow */
+
+class OperationBuffer { //eslint-disable-line no-unused-vars
+  i : number;
+  constructor () {
+    this.i = 4;
+  }
+}

src/OperationBuffer.spec.js

@@ -0,0 +1,13 @@
+/* @flow */
+/*eslint-env browser,jasmine,console */
+
+describe("Operation Buffer", function() {
+  var OB = new OperationBuffer(void 0);
+
+  it("contains spec with an expectation", function(done) {
+    setTimeout(function(){
+      done();
+    }, 1000);
+    expect(OB.i).toBe(4);
+  });
+});

src/y.js

@@ -1,4 +1 @@
 /* @flow */
-/* global Buffer */
-
-export default Buffer;