diff --git a/feature_tests/js/api/BorrowedFields.d.ts b/feature_tests/js/api/BorrowedFields.d.ts
index d9d32cb3a..f7f77c0a4 100644
--- a/feature_tests/js/api/BorrowedFields.d.ts
+++ b/feature_tests/js/api/BorrowedFields.d.ts
@@ -2,6 +2,6 @@
 /**
  */
 export class BorrowedFields {
-  a: Uint16Array;
+  a: string;
   b: string;
 }
diff --git a/tool/src/js/structs.rs b/tool/src/js/structs.rs
index ff3c5805b..f33dbcd81 100644
--- a/tool/src/js/structs.rs
+++ b/tool/src/js/structs.rs
@@ -500,9 +500,10 @@ pub fn gen_ts_type<W: fmt::Write>(
             return Ok(opt);
         }
         ast::TypeName::Writeable => unreachable!(),
-        ast::TypeName::StrReference(_, ast::StringEncoding::UnvalidatedUtf8 | ast::StringEncoding::UnvalidatedUtf16) => {
-            out.write_str("string")?
-        }
+        ast::TypeName::StrReference(
+            _,
+            ast::StringEncoding::UnvalidatedUtf8 | ast::StringEncoding::UnvalidatedUtf16,
+        ) => out.write_str("string")?,
         ast::TypeName::PrimitiveSlice(.., prim) => match prim {
             ast::PrimitiveType::i8 => write!(out, "Int8Array")?,
             ast::PrimitiveType::u8 => write!(out, "Uint8Array")?,