diff --git a/crates/oxc_isolated_declarations/src/class.rs b/crates/oxc_isolated_declarations/src/class.rs
index 9e32442a75abe6..0d11dd1d1033ad 100644
--- a/crates/oxc_isolated_declarations/src/class.rs
+++ b/crates/oxc_isolated_declarations/src/class.rs
@@ -303,11 +303,7 @@ impl<'a> IsolatedDeclarations<'a> {
         inferred_accessor_types
     }
 
-    pub fn transform_class(
-        &self,
-        decl: &Class<'a>,
-        modifiers: Option<Modifiers<'a>>,
-    ) -> Option<Box<'a, Class<'a>>> {
+    pub fn transform_class(&self, decl: &Class<'a>) -> Option<Box<'a, Class<'a>>> {
         if decl.declare {
             return None;
         }
@@ -462,11 +458,6 @@ impl<'a> IsolatedDeclarations<'a> {
 
         let body = self.ast.class_body(decl.body.span, elements);
 
-        let mut modifiers = modifiers.unwrap_or_else(|| self.modifiers_declare());
-        if decl.r#abstract {
-            modifiers.add_modifier(Modifier { span: SPAN, kind: ModifierKind::Abstract });
-        };
-
         Some(self.ast.class(
             decl.r#type,
             decl.span,
@@ -477,8 +468,8 @@ impl<'a> IsolatedDeclarations<'a> {
             self.ast.copy(&decl.super_type_parameters),
             self.ast.copy(&decl.implements),
             self.ast.new_vec(),
-            modifiers.is_contains_abstract(),
-            modifiers.is_contains_declare(),
+            decl.r#abstract,
+            self.is_declare(),
         ))
     }
 
diff --git a/crates/oxc_isolated_declarations/src/declaration.rs b/crates/oxc_isolated_declarations/src/declaration.rs
index 507fd754001a73..deea0e037422b8 100644
--- a/crates/oxc_isolated_declarations/src/declaration.rs
+++ b/crates/oxc_isolated_declarations/src/declaration.rs
@@ -39,7 +39,7 @@ impl<'a> IsolatedDeclarations<'a> {
             decl.span,
             decl.kind,
             self.ast.new_vec_from_iter(declarations),
-            self.modifiers_declare().is_contains_declare(),
+            self.is_declare(),
         )
     }
 
@@ -126,7 +126,7 @@ impl<'a> IsolatedDeclarations<'a> {
             decl.span,
             VariableDeclarationKind::Const,
             declarations,
-            self.modifiers_declare().is_contains_declare(),
+            self.is_declare(),
         )
     }
 
@@ -161,7 +161,7 @@ impl<'a> IsolatedDeclarations<'a> {
                     self.ast.copy(&decl.id),
                     Some(TSModuleDeclarationBody::TSModuleDeclaration(inner)),
                     decl.kind,
-                    self.modifiers_declare().is_contains_declare(),
+                    self.is_declare(),
                 )
             }
             TSModuleDeclarationBody::TSModuleBlock(block) => {
@@ -171,7 +171,7 @@ impl<'a> IsolatedDeclarations<'a> {
                     self.ast.copy(&decl.id),
                     Some(TSModuleDeclarationBody::TSModuleBlock(body)),
                     decl.kind,
-                    self.modifiers_declare().is_contains_declare(),
+                    self.is_declare(),
                 )
             }
         }
@@ -187,7 +187,7 @@ impl<'a> IsolatedDeclarations<'a> {
                 if !check_binding
                     || func.id.as_ref().is_some_and(|id| self.scope.has_reference(&id.name))
                 {
-                    self.transform_function(func, None).map(Declaration::FunctionDeclaration)
+                    self.transform_function(func).map(Declaration::FunctionDeclaration)
                 } else {
                     None
                 }
@@ -202,7 +202,7 @@ impl<'a> IsolatedDeclarations<'a> {
                 if !check_binding
                     || decl.id.as_ref().is_some_and(|id| self.scope.has_reference(&id.name))
                 {
-                    self.transform_class(decl, None).map(Declaration::ClassDeclaration)
+                    self.transform_class(decl).map(Declaration::ClassDeclaration)
                 } else {
                     None
                 }
diff --git a/crates/oxc_isolated_declarations/src/enum.rs b/crates/oxc_isolated_declarations/src/enum.rs
index 113d23af8aff9a..5324cc2a9becce 100644
--- a/crates/oxc_isolated_declarations/src/enum.rs
+++ b/crates/oxc_isolated_declarations/src/enum.rs
@@ -90,17 +90,13 @@ impl<'a> IsolatedDeclarations<'a> {
 
             members.push(member);
         }
-        let mut modifiers = self.modifiers_declare();
-        if decl.r#const {
-            modifiers.add_modifier(Modifier { span: SPAN, kind: ModifierKind::Const });
-        }
 
         Some(self.ast.ts_enum_declaration(
             decl.span,
             self.ast.copy(&decl.id),
             members,
-            modifiers.is_contains_const(),
-            modifiers.is_contains_declare(),
+            decl.r#const,
+            self.is_declare(),
         ))
     }
 
diff --git a/crates/oxc_isolated_declarations/src/function.rs b/crates/oxc_isolated_declarations/src/function.rs
index 808e9e79cdb843..2c18a7a2c4709a 100644
--- a/crates/oxc_isolated_declarations/src/function.rs
+++ b/crates/oxc_isolated_declarations/src/function.rs
@@ -13,11 +13,7 @@ use crate::{
 };
 
 impl<'a> IsolatedDeclarations<'a> {
-    pub fn transform_function(
-        &mut self,
-        func: &Function<'a>,
-        modifiers: Option<Modifiers<'a>>,
-    ) -> Option<Box<'a, Function<'a>>> {
+    pub fn transform_function(&mut self, func: &Function<'a>) -> Option<Box<'a, Function<'a>>> {
         if func.declare {
             None
         } else {
@@ -32,7 +28,7 @@ impl<'a> IsolatedDeclarations<'a> {
                 self.ast.copy(&func.id),
                 false,
                 false,
-                modifiers.unwrap_or_else(|| self.modifiers_declare()).is_contains_declare(),
+                self.is_declare(),
                 self.ast.copy(&func.this_param),
                 params,
                 None,
diff --git a/crates/oxc_isolated_declarations/src/lib.rs b/crates/oxc_isolated_declarations/src/lib.rs
index a9e4da97a3b441..285b653b4f96c4 100644
--- a/crates/oxc_isolated_declarations/src/lib.rs
+++ b/crates/oxc_isolated_declarations/src/lib.rs
@@ -393,14 +393,8 @@ impl<'a> IsolatedDeclarations<'a> {
         })
     }
 
-    pub fn modifiers_declare(&self) -> Modifiers<'a> {
-        if self.scope.is_ts_module_block_flag() {
-            // If we are in a module block, we don't need to add declare
-            Modifiers::empty()
-        } else {
-            Modifiers::new(
-                self.ast.new_vec_single(Modifier { span: SPAN, kind: ModifierKind::Declare }),
-            )
-        }
+    pub fn is_declare(&self) -> bool {
+        // If we are in a module block, we don't need to add declare
+        !self.scope.is_ts_module_block_flag()
     }
 }
diff --git a/crates/oxc_isolated_declarations/src/module.rs b/crates/oxc_isolated_declarations/src/module.rs
index 32e773a5cd902d..417f2a5f3bd8c4 100644
--- a/crates/oxc_isolated_declarations/src/module.rs
+++ b/crates/oxc_isolated_declarations/src/module.rs
@@ -38,10 +38,10 @@ impl<'a> IsolatedDeclarations<'a> {
     ) -> Option<(Option<VariableDeclaration<'a>>, ExportDefaultDeclaration<'a>)> {
         let declaration = match &decl.declaration {
             ExportDefaultDeclarationKind::FunctionDeclaration(decl) => self
-                .transform_function(decl, Some(Modifiers::empty()))
+                .transform_function(decl)
                 .map(|d| (None, ExportDefaultDeclarationKind::FunctionDeclaration(d))),
             ExportDefaultDeclarationKind::ClassDeclaration(decl) => self
-                .transform_class(decl, Some(Modifiers::empty()))
+                .transform_class(decl)
                 .map(|d| (None, ExportDefaultDeclarationKind::ClassDeclaration(d))),
             ExportDefaultDeclarationKind::TSInterfaceDeclaration(_) => {
                 Some((None, self.ast.copy(&decl.declaration)))
@@ -75,7 +75,7 @@ impl<'a> IsolatedDeclarations<'a> {
                             span: SPAN,
                             kind,
                             declarations,
-                            declare: self.modifiers_declare().is_contains_declare(),
+                            declare: self.is_declare(),
                         }),
                         ExportDefaultDeclarationKind::from(
                             self.ast.identifier_reference_expression(