remove unnecessary withCacheAsync

engine/lib/cache.ts

@@ -22,25 +22,6 @@ export function withCache<T, U extends (...args: Parameters<U>) => T>(
 	};
 }
 
-export function withCacheAsync<
-	T,
-	U extends (...args: Parameters<U>) => Promise<T>,
->(
-	fn: U,
-	cache: Cache<Promise<T>>,
-): (key: unknown, ...args: Parameters<U>) => Promise<T> {
-	return async (key, ...args) => {
-		if (cache.has(key)) {
-			return (await cache.get(key)) as T;
-		}
-
-		const value = fn(...args);
-		cache.set(key, value);
-
-		return await value;
-	};
-}
-
 export function memoize<T, U>(fn: (arg: U) => T): [(arg: U) => T, Cache<T>] {
 	const cache = new Map<unknown, T>();
 	const callback = withCache(fn, cache);