diff --git a/packages/frontend/src/type.ts b/packages/frontend/src/type.ts
index e1cea3936c..f8604a3771 100644
--- a/packages/frontend/src/type.ts
+++ b/packages/frontend/src/type.ts
@@ -7,5 +7,5 @@ export type WithRequired<T, K extends keyof T> = T & { [P in K]-?: T[P] };
 
 export type WithNonNullable<T, K extends keyof T> = T & { [P in K]-?: NonNullable<T[P]> };
 
-type _TupleOf<T, N extends number, R extends unknown[]> = R['length'] extends N ? R : _TupleOf<T, N, [T, ...R]>;
-export type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : _TupleOf<T, N, []> : never;
+type TupleOf<T, N extends number, R extends unknown[]> = R['length'] extends N ? R : TupleOf<T, N, [T, ...R]>;
+export type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : TupleOf<T, N, []> : never;