diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstNumber.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstNumber.java
index 5570daf..2678e98 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstNumber.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstNumber.java
@@ -30,15 +30,12 @@
 import net.bytebuddy.implementation.bytecode.constant.LongConstant;
 
 public final class Ts2JavaAstNumber implements ITs2JavaAstStackManipulation<Swc4jAstNumber> {
-    private final TypeDescription valueType;
     private boolean negative;
+    private TypeDescription valueType;
 
     public Ts2JavaAstNumber() {
-        this(null);
-    }
-
-    public Ts2JavaAstNumber(TypeDescription valueType) {
-        this.valueType = valueType;
+        negative = false;
+        valueType = null;
     }
 
     public TypeDescription getValueType() {
@@ -95,4 +92,9 @@ public Ts2JavaAstNumber setNegative(boolean negative) {
         this.negative = negative;
         return this;
     }
+
+    public Ts2JavaAstNumber setValueType(TypeDescription valueType) {
+        this.valueType = valueType;
+        return this;
+    }
 }
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstUnaryExpr.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstUnaryExpr.java
index c109e58..c4a6eb8 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstUnaryExpr.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstUnaryExpr.java
@@ -19,6 +19,7 @@
 import com.caoccao.javet.buddy.ts2java.compiler.JavaFunctionContext;
 import com.caoccao.javet.buddy.ts2java.exceptions.Ts2JavaAstException;
 import com.caoccao.javet.swc4j.ast.expr.Swc4jAstBinExpr;
+import com.caoccao.javet.swc4j.ast.expr.Swc4jAstIdent;
 import com.caoccao.javet.swc4j.ast.expr.Swc4jAstUnaryExpr;
 import com.caoccao.javet.swc4j.ast.expr.lit.Swc4jAstNumber;
 import com.caoccao.javet.swc4j.ast.interfaces.ISwc4jAstExpr;
@@ -73,15 +74,22 @@ public TypeDescription manipulate(JavaFunctionContext functionContext, Swc4jAstU
                 break;
             }
             case Minus: {
+                boolean opcodeNegativeRequired = true;
                 switch (arg.getType()) {
                     case BinExpr:
                         returnType = new Ts2JavaAstBinExpr()
                                 .manipulate(functionContext, arg.as(Swc4jAstBinExpr.class));
                         break;
+                    case Ident:
+                        returnType = new Ts2JavaAstIdent()
+                                .manipulate(functionContext, arg.as(Swc4jAstIdent.class));
+                        break;
                     case Number:
-                        return new Ts2JavaAstNumber()
+                        opcodeNegativeRequired = false;
+                        returnType = new Ts2JavaAstNumber()
                                 .setNegative(true)
                                 .manipulate(functionContext, arg.as(Swc4jAstNumber.class));
+                        break;
                     case UnaryExpr:
                         returnType = new Ts2JavaAstUnaryExpr()
                                 .manipulate(functionContext, arg.as(Swc4jAstUnaryExpr.class));
@@ -92,14 +100,16 @@ public TypeDescription manipulate(JavaFunctionContext functionContext, Swc4jAstU
                                 SimpleFreeMarkerFormat.format("UnaryExpr arg type ${argType} for - is not supported.",
                                         SimpleMap.of("argType", arg.getType().name())));
                 }
-                final int opcode = getOpcodeNegative(ast, returnType);
-                StackManipulation stackManipulation = new StackManipulation.Simple((
-                        MethodVisitor methodVisitor,
-                        Implementation.Context implementationContext) -> {
-                    methodVisitor.visitInsn(opcode);
-                    return StackManipulation.Size.ZERO;
-                });
-                functionContext.getStackManipulations().add(stackManipulation);
+                if (opcodeNegativeRequired) {
+                    final int opcode = getOpcodeNegative(ast, returnType);
+                    StackManipulation stackManipulation = new StackManipulation.Simple((
+                            MethodVisitor methodVisitor,
+                            Implementation.Context implementationContext) -> {
+                        methodVisitor.visitInsn(opcode);
+                        return StackManipulation.Size.ZERO;
+                    });
+                    functionContext.getStackManipulations().add(stackManipulation);
+                }
                 break;
             }
             default:
diff --git a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstVarDecl.java b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstVarDecl.java
index b701990..c8333d2 100644
--- a/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstVarDecl.java
+++ b/src/main/java/com/caoccao/javet/buddy/ts2java/ast/Ts2JavaAstVarDecl.java
@@ -52,21 +52,19 @@ public TypeDescription manipulate(JavaFunctionContext functionContext, Swc4jAstV
                             ISwc4jAstExpr expression = varDeclarator.getInit().get().unParenExpr();
                             TypeDescription valueType;
                             switch (expression.getType()) {
-                                case BinExpr: {
-                                    valueType = new Ts2JavaAstBinExpr().manipulate(
-                                            functionContext, expression.as(Swc4jAstBinExpr.class));
+                                case BinExpr:
+                                    valueType = new Ts2JavaAstBinExpr()
+                                            .manipulate(functionContext, expression.as(Swc4jAstBinExpr.class));
                                     break;
-                                }
-                                case Number: {
-                                    valueType = new Ts2JavaAstNumber(variableType).manipulate(
-                                            functionContext, expression.as(Swc4jAstNumber.class));
+                                case Number:
+                                    valueType = new Ts2JavaAstNumber()
+                                            .setValueType(variableType)
+                                            .manipulate(functionContext, expression.as(Swc4jAstNumber.class));
                                     break;
-                                }
-                                case Ident: {
-                                    valueType = new Ts2JavaAstIdent().manipulate(
-                                            functionContext, expression.as(Swc4jAstIdent.class));
+                                case Ident:
+                                    valueType = new Ts2JavaAstIdent()
+                                            .manipulate(functionContext, expression.as(Swc4jAstIdent.class));
                                     break;
-                                }
                                 default:
                                     throw new Ts2JavaAstException(
                                             expression,
diff --git a/src/test/java/com/caoccao/javet/buddy/ts2java/ast/TestBasicOperations.java b/src/test/java/com/caoccao/javet/buddy/ts2java/ast/TestBasicOperations.java
index 3fb1242..3295b6f 100644
--- a/src/test/java/com/caoccao/javet/buddy/ts2java/ast/TestBasicOperations.java
+++ b/src/test/java/com/caoccao/javet/buddy/ts2java/ast/TestBasicOperations.java
@@ -190,6 +190,15 @@ public void testMinus_I_I() throws Exception {
         assertEquals(-2, tsClass.invoke(3));
     }
 
+    @Test
+    public void testMinus_L_L() throws Exception {
+        TsClass tsClass = new TsClass(
+                "return -a;",
+                long.class,
+                TsMethodArgument.of("a", long.class));
+        assertEquals(-2L, tsClass.invoke(2L));
+    }
+
     @Test
     public void testMinus_Minus_II_I() throws Exception {
         TsClass tsClass = new TsClass(