diff --git a/binder/binder.h b/binder/binder.h
index 28f4b038d2ecfe000b020cd6552496d5d681d9d0..10d52ef951c5dca86d64509b83724fa55e8b4b6e 100644
--- a/binder/binder.h
+++ b/binder/binder.h
@@ -50,10 +50,10 @@ public:
     void IdentifierAnalysis();
 
     template <typename T, typename... Args>
-    T *AddDecl(const lexer::SourcePosition &pos, Args &&... args);
+    T *AddDecl(const lexer::SourcePosition &pos, Args &&...args);
 
     template <typename T, typename... Args>
-    T *AddTsDecl(const lexer::SourcePosition &pos, Args &&... args);
+    T *AddTsDecl(const lexer::SourcePosition &pos, Args &&...args);
 
     ParameterDecl *AddParamDecl(const ir::AstNode *param);
 
@@ -144,7 +144,7 @@ template <typename T>
 class LexicalScope {
 public:
     template <typename... Args>
-    explicit LexicalScope(Binder *binder, Args &&... args)
+    explicit LexicalScope(Binder *binder, Args &&...args)
         : LexicalScope(binder->Allocator()->New<T>(binder->Allocator(), binder->scope_, std::forward<Args>(args)...),
                        binder)
     {
@@ -183,7 +183,7 @@ private:
 };
 
 template <typename T, typename... Args>
-T *Binder::AddTsDecl(const lexer::SourcePosition &pos, Args &&... args)
+T *Binder::AddTsDecl(const lexer::SourcePosition &pos, Args &&...args)
 {
     T *decl = Allocator()->New<T>(std::forward<Args>(args)...);
 
@@ -195,7 +195,7 @@ T *Binder::AddTsDecl(const lexer::SourcePosition &pos, Args &&... args)
 }
 
 template <typename T, typename... Args>
-T *Binder::AddDecl(const lexer::SourcePosition &pos, Args &&... args)
+T *Binder::AddDecl(const lexer::SourcePosition &pos, Args &&...args)
 {
     T *decl = Allocator()->New<T>(std::forward<Args>(args)...);
 
diff --git a/binder/scope.h b/binder/scope.h
index 9621858f36bc2b887ed1fcbdbfc61b26cdb6b729..881abfb48ec6e46b012a7ed05f2cb1b43acdbad8 100644
--- a/binder/scope.h
+++ b/binder/scope.h
@@ -179,7 +179,7 @@ public:
     }
 
     template <typename T, typename... Args>
-    T *NewDecl(ArenaAllocator *allocator, Args &&... args);
+    T *NewDecl(ArenaAllocator *allocator, Args &&...args);
 
     template <typename DeclType, typename VariableType>
     VariableType *AddDecl(ArenaAllocator *allocator, util::StringView name, VariableFlags flags);
@@ -189,7 +189,7 @@ public:
                                    const ir::AstNode *node);
 
     template <typename T, typename... Args>
-    void PropagateBinding(ArenaAllocator *allocator, util::StringView name, Args &&... args);
+    void PropagateBinding(ArenaAllocator *allocator, util::StringView name, Args &&...args);
 
     VariableMap &Bindings()
     {
@@ -691,7 +691,7 @@ bool VariableScope::AddLexical(ArenaAllocator *allocator, Variable *currentVaria
 }
 
 template <typename T, typename... Args>
-T *Scope::NewDecl(ArenaAllocator *allocator, Args &&... args)
+T *Scope::NewDecl(ArenaAllocator *allocator, Args &&...args)
 {
     T *decl = allocator->New<T>(std::forward<Args>(args)...);
     decls_.push_back(decl);
@@ -726,7 +726,7 @@ VariableType *Scope::CreateVar(ArenaAllocator *allocator, util::StringView name,
 }
 
 template <typename T, typename... Args>
-void Scope::PropagateBinding(ArenaAllocator *allocator, util::StringView name, Args &&... args)
+void Scope::PropagateBinding(ArenaAllocator *allocator, util::StringView name, Args &&...args)
 {
     auto res = bindings_.find(name);
     if (res == bindings_.end()) {
diff --git a/compiler/core/pandagen.h b/compiler/core/pandagen.h
index 6041544cfb62254a1200217d303753fa5f8646dc..ee623bd7fb247d7adb176af4a116a57d9a680fb5 100644
--- a/compiler/core/pandagen.h
+++ b/compiler/core/pandagen.h
@@ -76,7 +76,6 @@ public:
     explicit PandaGen(ArenaAllocator *allocator, CompilerContext *context, binder::FunctionScope *scope)
         : allocator_(allocator),
           context_(context),
-          builder_(nullptr),
           debugInfo_(allocator_),
           topScope_(scope),
           scope_(topScope_),
@@ -387,7 +386,7 @@ public:
 private:
     ArenaAllocator *allocator_;
     CompilerContext *context_;
-    FunctionBuilder *builder_;
+    FunctionBuilder *builder_ {nullptr};
     DebugInfo debugInfo_;
     binder::FunctionScope *topScope_;
     binder::Scope *scope_;
diff --git a/compiler/core/regAllocator.h b/compiler/core/regAllocator.h
index ec7bfefc6382d6886e243e69f430db24178f97a5..da5eeffecfb7646ce4fdbc314bf26d6dddc792a6 100644
--- a/compiler/core/regAllocator.h
+++ b/compiler/core/regAllocator.h
@@ -39,13 +39,13 @@ protected:
     ArenaAllocator *Allocator() const;
 
     template <typename T, typename... Args>
-    T *Alloc(const ir::AstNode *node, Args &&... args)
+    T *Alloc(const ir::AstNode *node, Args &&...args)
     {
         return Allocator()->New<T>(node, std::forward<Args>(args)...);
     }
 
     template <typename T, typename... Args>
-    void Add(const ir::AstNode *node, Args &&... args)
+    void Add(const ir::AstNode *node, Args &&...args)
     {
         return PushBack(Alloc<T>(node, std::forward<Args>(args)...));
     }
@@ -67,7 +67,7 @@ public:
     }
 
     template <typename T, typename... Args>
-    void Emit(const ir::AstNode *node, Args &&... args)
+    void Emit(const ir::AstNode *node, Args &&...args)
     {
         Add<T>(node, std::forward<Args>(args)...);
     }
@@ -134,7 +134,7 @@ public:
     ~RegAllocator() = default;
 
     template <typename T, typename... Args>
-    void Emit(const ir::AstNode *node, Args &&... args)
+    void Emit(const ir::AstNode *node, Args &&...args)
     {
         auto *ins = Alloc<T>(node, std::forward<Args>(args)...);
         Run(ins);
@@ -152,7 +152,7 @@ public:
     ~RangeRegAllocator() = default;
 
     template <typename T, typename... Args>
-    void Emit(const ir::AstNode *node, VReg rangeStart, size_t argCount, Args &&... args)
+    void Emit(const ir::AstNode *node, VReg rangeStart, size_t argCount, Args &&...args)
     {
         auto *ins = Alloc<T>(node, std::forward<Args>(args)...);
         Run(ins, rangeStart, argCount);
diff --git a/ir/astDump.cpp b/ir/astDump.cpp
index acf37c7a810573771499467b9bee437e1459dd46..fceef8a07d6403e62feb7cf0480780cf407393f2 100644
--- a/ir/astDump.cpp
+++ b/ir/astDump.cpp
@@ -22,7 +22,7 @@
 
 namespace panda::es2panda::ir {
 
-AstDumper::AstDumper(const BlockStatement *program, util::StringView sourceCode) : index_(sourceCode), indent_(0)
+AstDumper::AstDumper(const BlockStatement *program, util::StringView sourceCode) : index_(sourceCode)
 {
     SerializeObject(reinterpret_cast<const ir::AstNode *>(program));
 }
diff --git a/ir/astDump.h b/ir/astDump.h
index ece0397babc56562c32c74e1cf5f62297cf41b65..76564e60914ade1060711dcaadcd1749f5a06422 100644
--- a/ir/astDump.h
+++ b/ir/astDump.h
@@ -199,7 +199,7 @@ private:
 
     lexer::LineIndex index_;
     std::stringstream ss_;
-    int32_t indent_;
+    int32_t indent_ {0};
 };
 }  // namespace panda::es2panda::ir
 
diff --git a/ir/base/scriptFunction.h b/ir/base/scriptFunction.h
index b0b1e9403e127baf55fd80de9eb388a02eb1a3ca..3e3a35ed94b630cf718840c0b840a5645e111ea6 100644
--- a/ir/base/scriptFunction.h
+++ b/ir/base/scriptFunction.h
@@ -43,7 +43,6 @@ public:
                             ir::ScriptFunctionFlags flags, bool declare)
         : AstNode(AstNodeType::SCRIPT_FUNCTION),
           scope_(scope),
-          id_(nullptr),
           params_(std::move(params)),
           typeParams_(typeParams),
           body_(body),
@@ -152,7 +151,7 @@ public:
 
 private:
     binder::FunctionScope *scope_;
-    Identifier *id_;
+    Identifier *id_ {nullptr};
     ArenaVector<Expression *> params_;
     TSTypeParameterDeclaration *typeParams_;
     AstNode *body_;
diff --git a/ir/expressions/arrayExpression.h b/ir/expressions/arrayExpression.h
index bd9265db3a83fe204f35433952b95276fabb3161..895ba8493a6bd4bf03385739e57ba12dbe4dfd6d 100644
--- a/ir/expressions/arrayExpression.h
+++ b/ir/expressions/arrayExpression.h
@@ -34,7 +34,7 @@ namespace panda::es2panda::ir {
 class ArrayExpression : public Expression {
 public:
     explicit ArrayExpression(AstNodeType nodeType, ArenaVector<Expression *> &&elements, bool trailingComma)
-        : Expression(nodeType), elements_(std::move(elements)), typeAnnotation_(nullptr), trailingComma_(trailingComma)
+        : Expression(nodeType), elements_(std::move(elements)), trailingComma_(trailingComma)
     {
     }
 
@@ -84,7 +84,7 @@ public:
 
 private:
     ArenaVector<Expression *> elements_;
-    Expression *typeAnnotation_;
+    Expression *typeAnnotation_ {nullptr};
     bool isDeclaration_ {};
     bool trailingComma_;
     bool optional_ {false};
diff --git a/ir/expressions/objectExpression.h b/ir/expressions/objectExpression.h
index d09eec73d006f31d0a4aa9dd6e0e35b89852368e..741db11cd4ea56d50e3d6de3160fdde919ce11fd 100644
--- a/ir/expressions/objectExpression.h
+++ b/ir/expressions/objectExpression.h
@@ -39,10 +39,7 @@ namespace panda::es2panda::ir {
 class ObjectExpression : public Expression {
 public:
     explicit ObjectExpression(AstNodeType nodeType, ArenaVector<Expression *> &&properties, bool trailingComma)
-        : Expression(nodeType),
-          properties_(std::move(properties)),
-          typeAnnotation_(nullptr),
-          trailingComma_(trailingComma)
+        : Expression(nodeType), properties_(std::move(properties)), trailingComma_(trailingComma)
     {
     }
 
@@ -84,7 +81,7 @@ private:
     void CompileRemainingProperties(compiler::PandaGen *pg, const util::BitSet *compiled, compiler::VReg objReg) const;
 
     ArenaVector<Expression *> properties_;
-    Expression *typeAnnotation_;
+    Expression *typeAnnotation_ {nullptr};
     bool isDeclaration_ {};
     bool trailingComma_ {};
     bool optional_ {false};
diff --git a/ir/ts/tsMappedType.cpp b/ir/ts/tsMappedType.cpp
index 7be2950b1057f39ea839231201912c59ab1367bf..9fd99c5a71ea2b5571e8553940b766b072514ec0 100644
--- a/ir/ts/tsMappedType.cpp
+++ b/ir/ts/tsMappedType.cpp
@@ -30,16 +30,15 @@ void TSMappedType::Iterate(const NodeTraverser &cb) const
 
 void TSMappedType::Dump(ir::AstDumper *dumper) const
 {
-    dumper->Add(
-        {{"type", "TSMappedType"},
-         {"typeParameter", typeParameter_},
-         {"typeAnnotation", AstDumper::Optional(typeAnnotation_)},
-         {"readonly", readonly_ == MappedOption::NO_OPTS
-                          ? AstDumper::Optional(false)
-                          : readonly_ == MappedOption::PLUS ? AstDumper::Optional("+") : AstDumper::Optional("-")},
-         {"optional", optional_ == MappedOption::NO_OPTS
-                          ? AstDumper::Optional(false)
-                          : optional_ == MappedOption::PLUS ? AstDumper::Optional("+") : AstDumper::Optional("-")}});
+    dumper->Add({{"type", "TSMappedType"},
+                 {"typeParameter", typeParameter_},
+                 {"typeAnnotation", AstDumper::Optional(typeAnnotation_)},
+                 {"readonly", readonly_ == MappedOption::NO_OPTS ? AstDumper::Optional(false)
+                              : readonly_ == MappedOption::PLUS  ? AstDumper::Optional("+")
+                                                                 : AstDumper::Optional("-")},
+                 {"optional", optional_ == MappedOption::NO_OPTS ? AstDumper::Optional(false)
+                              : optional_ == MappedOption::PLUS  ? AstDumper::Optional("+")
+                                                                 : AstDumper::Optional("-")}});
 }
 
 void TSMappedType::Compile([[maybe_unused]] compiler::PandaGen *pg) const {}
diff --git a/ir/ts/tsParameterProperty.cpp b/ir/ts/tsParameterProperty.cpp
index a1583d5a6a8d75887c2355684e9fd37c00ad3916..23cf6dc433e9df876a53ebe7b2cb223bd77a6d05 100644
--- a/ir/ts/tsParameterProperty.cpp
+++ b/ir/ts/tsParameterProperty.cpp
@@ -26,17 +26,15 @@ void TSParameterProperty::Iterate(const NodeTraverser &cb) const
 
 void TSParameterProperty::Dump(ir::AstDumper *dumper) const
 {
-    dumper->Add(
-        {{"type", "TSParameterProperty"},
-         {"accessibility", accessibility_ == AccessibilityOption::PUBLIC
-                               ? "public"
-                               : accessibility_ == AccessibilityOption::PRIVATE
-                                     ? "private"
-                                     : accessibility_ == AccessibilityOption::PROTECTED ? "protected" : "undefined"},
-         {"readonly", readonly_},
-         {"static", static_},
-         {"export", export_},
-         {"parameter", parameter_}});
+    dumper->Add({{"type", "TSParameterProperty"},
+                 {"accessibility", accessibility_ == AccessibilityOption::PUBLIC      ? "public"
+                                   : accessibility_ == AccessibilityOption::PRIVATE   ? "private"
+                                   : accessibility_ == AccessibilityOption::PROTECTED ? "protected"
+                                                                                      : "undefined"},
+                 {"readonly", readonly_},
+                 {"static", static_},
+                 {"export", export_},
+                 {"parameter", parameter_}});
 }
 
 void TSParameterProperty::Compile([[maybe_unused]] compiler::PandaGen *pg) const {}
diff --git a/lexer/regexp/regexp.cpp b/lexer/regexp/regexp.cpp
index 7058ffc8eac32fa5cf216ab7e11c02fc044d1519..6140f2940ab13a35c0f49226124cef34a4282353 100644
--- a/lexer/regexp/regexp.cpp
+++ b/lexer/regexp/regexp.cpp
@@ -29,7 +29,7 @@ RegExp::RegExp(util::StringView p, util::StringView f, RegExpFlags reFlags) : pa
 }
 
 RegExpParser::RegExpParser(const RegExp &re, ArenaAllocator *allocator)
-    : re_(re), allocator_ {allocator}, iter_(re_.patternStr), capturingGroupCount_(0)
+    : re_(re), allocator_ {allocator}, iter_(re_.patternStr)
 {
 }
 
diff --git a/lexer/regexp/regexp.h b/lexer/regexp/regexp.h
index 513c3405188ab5dcaed74db76a1fedf6fa150b8e..e6a4be21a052bcfede31cc667133316df6c9af6c 100644
--- a/lexer/regexp/regexp.h
+++ b/lexer/regexp/regexp.h
@@ -96,7 +96,7 @@ private:
     RegExp re_;
     ArenaAllocator *allocator_ {};
     util::StringView::Iterator iter_;
-    uint32_t capturingGroupCount_;
+    uint32_t capturingGroupCount_ {0};
     std::unordered_set<util::StringView> groupNames_;
 };
 
diff --git a/parser/parserImpl.cpp b/parser/parserImpl.cpp
index 6ecfc77b84dcbe26126be64ed45012ace09a8a34..87204a430fb3992a882b68eb80f0ec50d7c4f0cb 100644
--- a/parser/parserImpl.cpp
+++ b/parser/parserImpl.cpp
@@ -3208,10 +3208,12 @@ bool ParserImpl::CurrentTokenIsModifier(char32_t nextCp) const
 
 void ParserImpl::ThrowParameterModifierError(ir::ModifierFlags status) const
 {
-    ThrowSyntaxError(
-        {"'", status & ir::ModifierFlags::STATIC ? "static" : status & ir::ModifierFlags::ASYNC ? "async" : "declare",
-         "' modifier cannot appear on a parameter."},
-        lexer_->GetToken().Start());
+    ThrowSyntaxError({"'",
+                      status & ir::ModifierFlags::STATIC  ? "static"
+                      : status & ir::ModifierFlags::ASYNC ? "async"
+                                                          : "declare",
+                      "' modifier cannot appear on a parameter."},
+                     lexer_->GetToken().Start());
 }
 
 void ParserImpl::ThrowSyntaxError(std::string_view errorMessage) const
diff --git a/parser/parserImpl.h b/parser/parserImpl.h
index e73468a66427f1e910a1fc4261bc6cc2c7e85ebe..2d8f1fa250875db003f5aaacde389495e0fabe2d 100644
--- a/parser/parserImpl.h
+++ b/parser/parserImpl.h
@@ -195,7 +195,7 @@ private:
     [[noreturn]] void ThrowSyntaxError(std::string_view errorMessage, const lexer::SourcePosition &pos) const;
 
     template <typename T, typename... Args>
-    T *AllocNode(Args &&... args)
+    T *AllocNode(Args &&...args)
     {
         auto ret = program_.Allocator()->New<T>(std::forward<Args>(args)...);
         if (ret == nullptr) {
@@ -555,7 +555,7 @@ private:
 class SavedParserContext {
 public:
     template <typename... Args>
-    explicit SavedParserContext(ParserImpl *parser, Args &&... args) : parser_(parser), prev_(parser->context_)
+    explicit SavedParserContext(ParserImpl *parser, Args &&...args) : parser_(parser), prev_(parser->context_)
     {
         parser_->context_ = ParserContext(&prev_, std::forward<Args>(args)...);
     }
diff --git a/typescript/types/tupleType.cpp b/typescript/types/tupleType.cpp
index 58b4acc91f0d964ed04c7bd478121063b5acd5b2..d0a8597ee4e8f40aeaa3c44f4ca2817a6a0d7fcf 100644
--- a/typescript/types/tupleType.cpp
+++ b/typescript/types/tupleType.cpp
@@ -19,7 +19,7 @@
 
 namespace panda::es2panda::checker {
 
-TupleTypeIterator::TupleTypeIterator(TupleType *tuple) : tupleType_(tuple), iter_(0) {}
+TupleTypeIterator::TupleTypeIterator(TupleType *tuple) : tupleType_(tuple) {}
 
 Type *TupleTypeIterator::Next()
 {
diff --git a/typescript/types/tupleType.h b/typescript/types/tupleType.h
index 241cf60ad5067240a0c5950a20c0ffd661a3278c..e64a7009f5cb401e5a4e3f789eabf4c056f2243b 100644
--- a/typescript/types/tupleType.h
+++ b/typescript/types/tupleType.h
@@ -36,7 +36,7 @@ public:
 
 private:
     TupleType *tupleType_;
-    uint32_t iter_;
+    uint32_t iter_ {0};
 };
 
 using NamedTupleMemberPool = std::unordered_map<binder::LocalVariable *, util::StringView>;
diff --git a/typescript/types/type.cpp b/typescript/types/type.cpp
index 2b1d8a3647922f326e245f0b4b2967d8124c22a9..38c732ac7a4b971d98c169c7a498df66d6b1f0ae 100644
--- a/typescript/types/type.cpp
+++ b/typescript/types/type.cpp
@@ -21,7 +21,7 @@
 
 namespace panda::es2panda::checker {
 
-Type::Type(TypeFlag flag) : typeFlags_(flag), variable_(nullptr)
+Type::Type(TypeFlag flag) : typeFlags_(flag)
 {
     static uint64_t typeId = 0;
     id_ = ++typeId;
diff --git a/typescript/types/type.h b/typescript/types/type.h
index 058c2ec7d16890a4ce9c25b6e6afce029bc04f13..7c5f311646903e06fda4a87648d2851c263db4b8 100644
--- a/typescript/types/type.h
+++ b/typescript/types/type.h
@@ -89,7 +89,7 @@ public:
 
 protected:
     TypeFlag typeFlags_;
-    binder::Variable *variable_;  // Variable associated with the type if any
+    binder::Variable *variable_ {nullptr};  // Variable associated with the type if any
     uint64_t id_;
 };
 
diff --git a/typescript/types/typeRelation.cpp b/typescript/types/typeRelation.cpp
index 6f9d638e7152cbe61fe8b6d6b9f69b26b9523f1a..7bee1301e243d1cd6840946ffdf474a510d78a2e 100644
--- a/typescript/types/typeRelation.cpp
+++ b/typescript/types/typeRelation.cpp
@@ -26,7 +26,7 @@ const Type *AsSrc::GetType() const
     return type_;
 }
 
-TypeRelation::TypeRelation(Checker *checker) : checker_(checker), result_(RelationResult::FALSE) {}
+TypeRelation::TypeRelation(Checker *checker) : checker_(checker) {}
 
 bool TypeRelation::IsTrue() const
 {
diff --git a/typescript/types/typeRelation.h b/typescript/types/typeRelation.h
index 27bc93180bd8746f0dffe02d55cd6633ec1775ce..9591841a371c0b4afd0c495945fff2bd27bac1e1 100644
--- a/typescript/types/typeRelation.h
+++ b/typescript/types/typeRelation.h
@@ -104,7 +104,7 @@ private:
                                RelationType type) const;
 
     Checker *checker_;
-    RelationResult result_;
+    RelationResult result_ {RelationResult::FALSE};
 };
 
 }  // namespace panda::es2panda::checker