diff --git a/packages/core/src/util/closure.ts b/packages/core/src/util/closure.ts
index de36d31b0d..19368bc807 100644
--- a/packages/core/src/util/closure.ts
+++ b/packages/core/src/util/closure.ts
@@ -15,6 +15,6 @@
  * to something which is retained otherwise the call to `noSideEffects` will be removed by closure
  * compiler.
  */
-export function noSideEffects(fn: () => void): string {
-  return '' + {toString: fn};
-}
\ No newline at end of file
+export function noSideEffects<T>(fn: () => T): T {
+  return {toString: fn}.toString() as unknown as T;
+}