fix: fix babel requirement: instance should be instanceof constructor…

…, even if constructor was repla

fix #55

src/decorators.ts

@@ -26,7 +26,12 @@ function applyReflect (target, advices, methodName, keyJoinPoint, original) {
   if (methodName === "constructor") {
     const keyBeforeInstance = generateKey(KEY_BEFORE_INSTANCE, methodName)
     const keyAfterInstance = generateKey(KEY_AFTER_INSTANCE, methodName)
-    return wrapMethod(target, methodName, keyBeforeInstance, keyAfterInstance)
+    // this is only needed to avoid babel's TypeError https://github.com/babel/babel/issues/682
+    // and should be removed in the future when babel isn't no longer needed to transpile ES6 classes
+    const result = wrapMethod(target, methodName, keyBeforeInstance, keyAfterInstance)
+    result.prototype = target.prototype
+    return result
+
   } else {
     const keyBeforeMethod = generateKey(KEY_BEFORE_METHOD, methodName)
     const keyAfterMethod = generateKey(KEY_AFTER_METHOD, methodName)

test/inject.spec.ts

@@ -42,6 +42,10 @@ describe("inject specs", () => {
     model = new DummyModel()
   })
 
+  it("Instance decorators do not broke protoChain", () => {
+    expect(test).toBeInstanceOf(Test)
+  })
+
   it("should be able to inject dependencies", () => {
     expect(model.$ser).toBeInstanceOf(SomeService)
     expect(test.$ser).toBeInstanceOf(SomeService)