diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/Ts2JavaX.java b/src/main/java/com/caoccao/javet/buddy/ts2java/Ts2JavaX.java
index a192804..618372c 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/Ts2JavaX.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/Ts2JavaX.java
@@ -18,6 +18,7 @@
 
 import com.caoccao.javet.buddy.ts2java.ast.memo.Ts2JavaMemoDynamicType;
 import com.caoccao.javet.buddy.ts2java.ast.stmt.Ts2JavaAstClassDecl;
+import com.caoccao.javet.buddy.ts2java.compiler.visitors.JavaLoggingMethodVisitor;
 import com.caoccao.javet.buddy.ts2java.exceptions.Ts2JavaException;
 import com.caoccao.javet.swc4j.Swc4j;
 import com.caoccao.javet.swc4j.ast.program.Swc4jAstModule;
@@ -30,6 +31,7 @@
 import net.bytebuddy.ByteBuddy;
 import net.bytebuddy.dynamic.DynamicType;
 import net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy;
+import net.bytebuddy.jar.asm.Opcodes;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -42,6 +44,7 @@ public class Ts2JavaX {
             .setMediaType(Swc4jMediaType.TypeScript)
             .setParseMode(Swc4jParseMode.Module)
             .setCaptureAst(true);
+    protected static boolean logging = false;
     protected final String packageName;
     protected final String tsCode;
     protected List<Class<?>> classes;
@@ -52,6 +55,14 @@ public Ts2JavaX(String packageName, String tsCode) {
         this.tsCode = Objects.requireNonNull(tsCode);
     }
 
+    public static void disableLogging() {
+        logging = false;
+    }
+
+    public static void enableLogging() {
+        logging = true;
+    }
+
     public List<Class<?>> getClasses() {
         return classes;
     }
@@ -87,6 +98,10 @@ public void transpile() throws Swc4jCoreException {
             Ts2JavaMemoDynamicType memo = new Ts2JavaMemoDynamicType(builder);
             Ts2JavaAstClassDecl ast = new Ts2JavaAstClassDecl(null, classDecl, memo, getPackageName());
             ast.compile();
+            if (logging) {
+                JavaLoggingMethodVisitor methodVisitor = new JavaLoggingMethodVisitor(Opcodes.ASM9);
+                ast.apply(methodVisitor, null);
+            }
             builder = memo.getBuilder();
             try (DynamicType.Unloaded<?> unloadedType = builder.make()) {
                 classes.add(unloadedType.load(getClass().getClassLoader()).getLoaded());
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClass.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClass.java
index 9fda870..ace1288 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClass.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClass.java
@@ -26,6 +26,8 @@
 import com.caoccao.javet.swc4j.ast.interfaces.ISwc4jAstClassMember;
 import com.caoccao.javet.utils.SimpleFreeMarkerFormat;
 import com.caoccao.javet.utils.SimpleMap;
+import net.bytebuddy.implementation.Implementation;
+import net.bytebuddy.jar.asm.MethodVisitor;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -51,6 +53,14 @@ public Ts2JavaAstClass(ITs2JavaAst<?, ?> parent, Swc4jAstClass ast, Ts2JavaMemoD
         }
     }
 
+    @Override
+    public Size apply(MethodVisitor methodVisitor, Implementation.Context context) {
+        return body.stream()
+                .map((classMember) -> classMember.apply(methodVisitor, context))
+                .reduce(BaseTs2JavaAst::mergeSize)
+                .orElse(Size.ZERO);
+    }
+
     @Override
     public void compile() {
         body.forEach(ITs2JavaAstClassMember::compile);
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClassMethod.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClassMethod.java
index ab4cd2b..0992eb5 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClassMethod.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/clazz/Ts2JavaAstClassMethod.java
@@ -27,6 +27,8 @@
 import com.caoccao.javet.swc4j.ast.expr.Swc4jAstIdentName;
 import com.caoccao.javet.utils.SimpleFreeMarkerFormat;
 import com.caoccao.javet.utils.SimpleMap;
+import net.bytebuddy.implementation.Implementation;
+import net.bytebuddy.jar.asm.MethodVisitor;
 
 public class Ts2JavaAstClassMethod
         extends BaseTs2JavaAst<Swc4jAstClassMethod, Ts2JavaMemoDynamicType>
@@ -59,6 +61,11 @@ public Ts2JavaAstClassMethod(ITs2JavaAst<?, ?> parent, Swc4jAstClassMethod ast,
         function = new Ts2JavaAstFunction(this, ast.getFunction(), memo, name, _static, accessibility);
     }
 
+    @Override
+    public Size apply(MethodVisitor methodVisitor, Implementation.Context context) {
+        return function.apply(methodVisitor, context);
+    }
+
     @Override
     public void compile() {
         function.compile();
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/interfaces/ITs2JavaAst.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/interfaces/ITs2JavaAst.java
index 37d1aeb..7d97ddd 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/interfaces/ITs2JavaAst.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/interfaces/ITs2JavaAst.java
@@ -31,7 +31,7 @@ public interface ITs2JavaAst<AST extends ISwc4jAst, Memo extends Ts2JavaMemo>
     @Override
     default Size apply(MethodVisitor methodVisitor, Implementation.Context context) {
         throw new Ts2JavaException(
-                SimpleFreeMarkerFormat.format("${type} is not supported.",
+                SimpleFreeMarkerFormat.format("${type}.apply() is not implemented.",
                         SimpleMap.of("type", getClass().getSimpleName())));
     }
 
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/stmt/Ts2JavaAstClassDecl.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/stmt/Ts2JavaAstClassDecl.java
index a24ce59..764a34d 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/stmt/Ts2JavaAstClassDecl.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/stmt/Ts2JavaAstClassDecl.java
@@ -23,6 +23,8 @@
 import com.caoccao.javet.buddy.ts2java.ast.memo.Ts2JavaMemoDynamicType;
 import com.caoccao.javet.swc4j.ast.stmt.Swc4jAstClassDecl;
 import com.caoccao.javet.utils.StringUtils;
+import net.bytebuddy.implementation.Implementation;
+import net.bytebuddy.jar.asm.MethodVisitor;
 
 public class Ts2JavaAstClassDecl
         extends BaseTs2JavaAst<Swc4jAstClassDecl, Ts2JavaMemoDynamicType>
@@ -40,6 +42,11 @@ public Ts2JavaAstClassDecl(
         this.packageName = packageName;
     }
 
+    @Override
+    public Size apply(MethodVisitor methodVisitor, Implementation.Context context) {
+        return clazz.apply(methodVisitor, context);
+    }
+
     @Override
     public void compile() {
         String className = StringUtils.isEmpty(packageName)
diff --git a/src/test/java/com/caoccao/javet/buddy/ts2java/BaseTestTs2Java.java b/src/test/java/com/caoccao/javet/buddy/ts2java/BaseTestTs2Java.java
index c4ac644..76a3d39 100644
--- a/src/test/java/com/caoccao/javet/buddy/ts2java/BaseTestTs2Java.java
+++ b/src/test/java/com/caoccao/javet/buddy/ts2java/BaseTestTs2Java.java
@@ -30,10 +30,12 @@
 
 public class BaseTestTs2Java {
     protected void disableLogging() {
+        Ts2JavaX.disableLogging();
         Ts2JavaAstClassFunction.setMethodVisitor(null);
     }
 
     protected void enableLogging() {
+        Ts2JavaX.enableLogging();
         Ts2JavaAstClassFunction.setMethodVisitor(new JavaLoggingMethodVisitor(Opcodes.ASM9));
     }