wip: add cache to core

package.json

@@ -115,6 +115,9 @@
         "react-dom",
         "vite"
       ]
+    },
+    "patchedDependencies": {
+      "astro@2.0.17": "patches/astro@2.0.17.patch"
     }
   }
 }

patches/astro@2.0.17.patch

@@ -0,0 +1,30 @@
+diff --git a/dist/content/internal.js b/dist/content/internal.js
+index 697a57cdce15610a422f9a42e861f2f4d7d99737..cb9f11759651c0516ee4bbc2334e1c137e5f3bac 100644
+--- a/dist/content/internal.js
++++ b/dist/content/internal.js
+@@ -28,12 +28,17 @@ function createCollectionToGlobResultMap({
+   }
+   return collectionToGlobResultMap;
+ }
++const cacheByCollection = new Map();
+ function createGetCollection({
+   collectionToEntryMap,
+   collectionToRenderEntryMap
+ }) {
+   return async function getCollection(collection, filter) {
+     const lazyImports = Object.values(collectionToEntryMap[collection] ?? {});
++    // TODO: cache on prod builds only
++    if (cacheByCollection.has(collection)) {
++			return cacheByCollection.get(collection);
++		}
+     const entries = Promise.all(
+       lazyImports.map(async (lazyImport) => {
+         const entry = await lazyImport();
+@@ -53,6 +58,7 @@ function createGetCollection({
+         };
+       })
+     );
++    cacheByCollection.set(collection, entries);
+     if (typeof filter === "function") {
+       return (await entries).filter(filter);
+     } else {