diff --git a/crates/oxc_formatter/src/write/class.rs b/crates/oxc_formatter/src/write/class.rs
index f443b15ef7b69..1d2640bf985b9 100644
--- a/crates/oxc_formatter/src/write/class.rs
+++ b/crates/oxc_formatter/src/write/class.rs
@@ -102,15 +102,6 @@ impl<'a> FormatWrite<'a> for AstNode<'a, MethodDefinition<'a>> {
             write!(f, "?")?;
         }
 
-        if value.type_parameters.is_none() {
-            // // Handle comments between method name and parameters
-            // // Example: method /* comment */ (param) {}
-            // let comments = f.context().comments().comments_before(value.params().span.start);
-            // if !comments.is_empty() {
-            //     write!(f, [space(), FormatTrailingComments::Comments(comments)])?;
-            // }
-        }
-
         format_grouped_parameters_with_return_type(
             value.type_parameters(),
             value.this_param.as_deref(),
@@ -639,30 +630,28 @@ pub fn format_grouped_parameters_with_return_type<'a>(
     return_type: Option<&AstNode<'a, TSTypeAnnotation<'a>>>,
     f: &mut Formatter<'_, 'a>,
 ) -> FormatResult<()> {
-    write!(f, [type_parameters])?;
-
     group(&format_once(|f| {
+        let mut format_type_parameters = type_parameters.memoized();
         let mut format_parameters = params.memoized();
         let mut format_return_type = return_type.memoized();
 
         // Inspect early, in case the `return_type` is formatted before `parameters`
         // in `should_group_function_parameters`.
+        format_type_parameters.inspect(f)?;
         format_parameters.inspect(f)?;
 
         let group_parameters = should_group_function_parameters(
             type_parameters.map(AsRef::as_ref),
-            params.items.len()
-                + usize::from(params.rest.is_some())
-                + usize::from(this_param.is_some()),
+            params.parameters_count() + usize::from(this_param.is_some()),
             return_type.map(AsRef::as_ref),
             &mut format_return_type,
             f,
         )?;
 
         if group_parameters {
-            write!(f, [group(&format_parameters)])
+            write!(f, [group(&format_args!(format_type_parameters, format_parameters))])
         } else {
-            write!(f, [format_parameters])
+            write!(f, [format_type_parameters, format_parameters])
         }?;
 
         write!(f, [format_return_type])
diff --git a/crates/oxc_formatter/src/write/function.rs b/crates/oxc_formatter/src/write/function.rs
index ceafa4d85531c..94e02fc4a87f8 100644
--- a/crates/oxc_formatter/src/write/function.rs
+++ b/crates/oxc_formatter/src/write/function.rs
@@ -108,9 +108,7 @@ impl<'a> FormatWrite<'a> for FormatFunction<'a, '_> {
 
                 let group_parameters = should_group_function_parameters(
                     self.type_parameters.as_deref(),
-                    params.items.len()
-                        + usize::from(params.rest.is_some())
-                        + usize::from(self.this_param.is_some()),
+                    params.parameters_count() + usize::from(self.this_param.is_some()),
                     self.return_type.as_deref(),
                     &mut format_return_type,
                     f,
diff --git a/crates/oxc_formatter/src/write/mod.rs b/crates/oxc_formatter/src/write/mod.rs
index 57b904de2f70a..fe9f7b3a81307 100644
--- a/crates/oxc_formatter/src/write/mod.rs
+++ b/crates/oxc_formatter/src/write/mod.rs
@@ -173,16 +173,16 @@ impl<'a> FormatWrite<'a> for AstNode<'a, ObjectProperty<'a>> {
         };
 
         if self.method || is_accessor {
-            let AstNodes::Function(func) = self.value().as_ast_nodes() else {
+            let AstNodes::Function(value) = self.value().as_ast_nodes() else {
                 unreachable!(
                     "The `value` always be a function node if `method` or `accessor` is true"
                 )
             };
 
-            if func.r#async() {
+            if value.r#async() {
                 write!(f, ["async", space()])?;
             }
-            if func.generator() {
+            if value.generator() {
                 write!(f, "*")?;
             }
             if self.computed {
@@ -191,14 +191,15 @@ impl<'a> FormatWrite<'a> for AstNode<'a, ObjectProperty<'a>> {
                 format_property_key(self.key(), f)?;
             }
 
-            if let Some(type_parameters) = &func.type_parameters() {
-                write!(f, type_parameters)?;
-            }
-            write!(f, group(&func.params()))?;
-            if let Some(return_type) = &func.return_type() {
-                write!(f, return_type)?;
-            }
-            if let Some(body) = &func.body() {
+            format_grouped_parameters_with_return_type(
+                value.type_parameters(),
+                value.this_param.as_deref(),
+                value.params(),
+                value.return_type(),
+                f,
+            )?;
+
+            if let Some(body) = &value.body() {
                 write!(f, [space(), body])?;
             }
 
@@ -1561,7 +1562,13 @@ impl<'a> Format<'a> for AstNode<'a, Vec<'a, TSSignature<'a>>> {
 
 impl<'a> FormatWrite<'a> for AstNode<'a, TSCallSignatureDeclaration<'a>> {
     fn write(&self, f: &mut Formatter<'_, 'a>) -> FormatResult<()> {
-        write!(f, group(&format_args!(self.type_parameters(), self.params(), self.return_type())))
+        format_grouped_parameters_with_return_type(
+            self.type_parameters(),
+            None,
+            self.params(),
+            self.return_type(),
+            f,
+        )
     }
 }
 
@@ -1600,7 +1607,13 @@ impl<'a> FormatWrite<'a> for AstNode<'a, TSMethodSignature<'a>> {
 impl<'a> FormatWrite<'a> for AstNode<'a, TSConstructSignatureDeclaration<'a>> {
     fn write(&self, f: &mut Formatter<'_, 'a>) -> FormatResult<()> {
         write!(f, ["new", space()])?;
-        write!(f, group(&format_args!(self.type_parameters(), self.params(), self.return_type())))
+        format_grouped_parameters_with_return_type(
+            self.type_parameters(),
+            None,
+            self.params(),
+            self.return_type(),
+            f,
+        )
     }
 }
 
diff --git a/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts b/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts
new file mode 100644
index 0000000000000..d98eb66615314
--- /dev/null
+++ b/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts
@@ -0,0 +1,24 @@
+
+type A = {
+  new(...args): T<{
+    A
+  }
+  >
+};
+
+
+type A1 = {
+  (...args): T<{
+    A
+  }
+  >
+};
+
+type A2 = {
+  bar(
+    ...args
+  ): T<{
+    A
+  }>
+}
+
diff --git a/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts.snap b/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts.snap
new file mode 100644
index 0000000000000..4194336bb782b
--- /dev/null
+++ b/crates/oxc_formatter/tests/fixtures/ts/method-signatures/grouped.ts.snap
@@ -0,0 +1,49 @@
+---
+source: crates/oxc_formatter/tests/fixtures/mod.rs
+---
+==================== Input ====================
+
+type A = {
+  new(...args): T<{
+    A
+  }
+  >
+};
+
+
+type A1 = {
+  (...args): T<{
+    A
+  }
+  >
+};
+
+type A2 = {
+  bar(
+    ...args
+  ): T<{
+    A
+  }>
+}
+
+
+==================== Output ====================
+type A = {
+  new (...args): T<{
+    A;
+  }>;
+};
+
+type A1 = {
+  (...args): T<{
+    A;
+  }>;
+};
+
+type A2 = {
+  bar(...args): T<{
+    A;
+  }>;
+};
+
+===================== End =====================
diff --git a/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts b/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts
new file mode 100644
index 0000000000000..4c2a678c24a13
--- /dev/null
+++ b/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts
@@ -0,0 +1,6 @@
+const builder = {
+  build(environment: BuildEnvironment): Promise<
+    RollupOutput | RollupOutput[]
+  > {
+  },
+}
diff --git a/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts.snap b/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts.snap
new file mode 100644
index 0000000000000..5b00fabcf02f7
--- /dev/null
+++ b/crates/oxc_formatter/tests/fixtures/ts/objects/methods.ts.snap
@@ -0,0 +1,19 @@
+---
+source: crates/oxc_formatter/tests/fixtures/mod.rs
+---
+==================== Input ====================
+const builder = {
+  build(environment: BuildEnvironment): Promise<
+    RollupOutput | RollupOutput[]
+  > {
+  },
+}
+
+==================== Output ====================
+const builder = {
+  build(
+    environment: BuildEnvironment,
+  ): Promise<RollupOutput | RollupOutput[]> {},
+};
+
+===================== End =====================