refactor: extact var fo ts

_fixtures/ts/Class.ts

-
 interface IPerson {
     name: string;
 }

trial/pkg/application/ts/ts_ident_app_test.go

@@ -182,3 +182,14 @@ function buildName(firstName: string, ...restOfName: string[]) {
 	g.Expect(parameters[0].Name).To(Equal("firstName"))
 	g.Expect(parameters[1].Name).To(Equal("restOfName"))
 }
+
+func Test_ShouldGetClassFields(t *testing.T) {
+	g := NewGomegaWithT(t)
+
+	app := new(TypeScriptApiApp)
+	code, _ := ioutil.ReadFile("../../../../_fixtures/ts/Class.ts")
+
+	results := app.Analysis(string(code))
+
+	g.Expect(len(results[1].Fields)).To(Equal(0))
+}

trial/pkg/ast/typescript_ident_listener.go

@@ -125,19 +125,26 @@ func (s *TypeScriptIdentListener) EnterClassDeclaration(ctx *parser.ClassDeclara
 		currentNode.Extend = referenceContext.TypeName().GetText()
 	}
 
-	for _, classElement := range ctx.ClassTail().(*parser.ClassTailContext).AllClassElement() {
+	classTailContext := ctx.ClassTail().(*parser.ClassTailContext)
+	handleClassBodyElements(classTailContext)
+	classNodeQueue = append(classNodeQueue, *currentNode)
+}
+
+func handleClassBodyElements(classTailContext *parser.ClassTailContext) {
+	for _, classElement := range classTailContext.AllClassElement() {
 		elementChild := classElement.GetChild(0)
-		if reflect.TypeOf(elementChild).String() == "*parser.ConstructorDeclarationContext" {
+		elementTypeStr := reflect.TypeOf(elementChild).String()
+		switch elementTypeStr {
+		case "*parser.ConstructorDeclarationContext":
 			constructorDeclCtx := elementChild.(*parser.ConstructorDeclarationContext)
 			currentNode.Methods = append(currentNode.Methods, BuildConstructorMethod(constructorDeclCtx))
-		} else if reflect.TypeOf(elementChild).String() == "*parser.PropertyMemberDeclarationContext" {
-			s.handlePropertyMember(elementChild)
+		case "*parser.PropertyMemberDeclarationContext":
+			handlePropertyMember(elementChild)
 		}
 	}
-	classNodeQueue = append(classNodeQueue, *currentNode)
 }
 
-func (s *TypeScriptIdentListener) handlePropertyMember(elementChild antlr.Tree) {
+func handlePropertyMember(elementChild antlr.Tree) {
 	propertyMemberCtx := elementChild.(*parser.PropertyMemberDeclarationContext)
 	callSignaturePos := 3
 	if propertyMemberCtx.GetChildCount() >= callSignaturePos {