diff --git a/crates/oxc_data_structures/src/stack/non_empty.rs b/crates/oxc_data_structures/src/stack/non_empty.rs
index 2e2d6234a98ee..7bbe4e00f8d92 100644
--- a/crates/oxc_data_structures/src/stack/non_empty.rs
+++ b/crates/oxc_data_structures/src/stack/non_empty.rs
@@ -216,20 +216,6 @@ impl<T> NonEmptyStack<T> {
         Self { cursor: start, start, end }
     }
 
-    /// Get reference to first value on stack.
-    #[inline]
-    pub fn first(&self) -> &T {
-        // SAFETY: All methods ensure `self.start` always points to a valid initialized `T`
-        unsafe { self.start.as_ref() }
-    }
-
-    /// Get mutable reference to first value on stack.
-    #[inline]
-    pub fn first_mut(&mut self) -> &mut T {
-        // SAFETY: All methods ensure `self.start` always points to a valid initialized `T`
-        unsafe { self.start.as_mut() }
-    }
-
     /// Get reference to last value on stack.
     #[inline]
     pub fn last(&self) -> &T {
diff --git a/crates/oxc_transformer/src/typescript/enum.rs b/crates/oxc_transformer/src/typescript/enum.rs
index 3769870bb0bf7..793219708be6b 100644
--- a/crates/oxc_transformer/src/typescript/enum.rs
+++ b/crates/oxc_transformer/src/typescript/enum.rs
@@ -574,7 +574,9 @@ impl IdentifierReferenceRename<'_, '_> {
         //   }
         // }
         // ```
-        *self.scope_stack.first() == symbol_scope_id
+        //
+        // `NonEmptyStack` guarantees that the stack is not empty.
+        *self.scope_stack.first().unwrap() == symbol_scope_id
             // The resolved symbol is declared outside the enum,
             // and we have checked that the name exists in previous_enum_members:
             //