fix type warning

Author: thebuilder

src/__tests__/observe.test.ts

@@ -39,7 +39,6 @@ test("should convert options to id", () => {
       threshold: 0,
       // @ts-expect-error
       trackVisibility: true,
-      // @ts-expect-error
       delay: 500,
     }),
   ).toMatchInlineSnapshot(`"delay_500,threshold_0,trackVisibility_true"`);