diff --git a/tests/typescript/declare/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/declare/__snapshots__/jsfmt.spec.js.snap
index 82d434d08950..fba2ff4d264e 100644
--- a/tests/typescript/declare/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/declare/__snapshots__/jsfmt.spec.js.snap
@@ -50,6 +50,8 @@ declare namespace A {
     function y(): void;
 }
 
+declare function f([]?)
+
 =====================================output=====================================
 declare function x();
 declare function y(): void;
@@ -59,6 +61,8 @@ declare namespace A {
   function y(): void;
 }
 
+declare function f([]?);
+
 ================================================================================
 `;
 
diff --git a/tests/typescript/declare/declare_function.ts b/tests/typescript/declare/declare_function.ts
index 67710eb24f78..d6b56a0c2c05 100644
--- a/tests/typescript/declare/declare_function.ts
+++ b/tests/typescript/declare/declare_function.ts
@@ -5,3 +5,5 @@ declare namespace A {
     function x();
     function y(): void;
 }
+
+declare function f([]?)