remove the unnecessary Partial

Author: dario-piotrowicz

packages/open-next/src/overrides/incrementalCache/multi-tier-ddb-s3.ts

@@ -50,9 +50,15 @@ const buildDynamoKey = (key: string) => {
  */
 const multiTierCache: IncrementalCache = {
   name: "multi-tier-ddb-s3",
-  async get(key, isFetch) {
+  async get<IsFetch extends boolean = false>(key: string, isFetch?: IsFetch) {
     // First we check the local cache
-    const localCacheEntry = localCache.get(key);
+    const localCacheEntry = localCache.get(key) as
+      | {
+          value: CacheValue<IsFetch>;
+          lastModified: number;
+        }
+      | undefined;
+
     if (localCacheEntry) {
       if (Date.now() - localCacheEntry.lastModified < localCacheTTL) {
         debug("Using local cache without checking ddb");

packages/open-next/src/types/overrides.ts

@@ -75,8 +75,12 @@ export type WithLastModified<T> = {
   value?: T;
 };
 
+export function isFetchPredicate(value: CacheValue<boolean>): value is CacheValue<true> {
+  return "kind" in value;
+}
+
 export type CacheValue<IsFetch extends boolean> = (IsFetch extends true
-  ? Partial<CachedFetchValue>
+  ? CachedFetchValue
   : CachedFile) & { revalidate?: number | false };
 
 export type IncrementalCache = {