fix: LiteralUnion type is not work (#119)

Author: json-q

src/utils/types.ts

@@ -1,3 +1,3 @@
 /** https://github.com/Microsoft/TypeScript/issues/29729 */
 // eslint-disable-next-line @typescript-eslint/ban-types
-export type LiteralUnion<T extends U, U> = T | (U & {});
+export type LiteralUnion<T extends U, U> = T | (U & Record<never, never>);