fix: type casts to bridge Rollup vs Rolldown ✨

Author: gioboa

.changeset/smooth-ends-count.md

@@ -0,0 +1,5 @@
+---
+'@builder.io/qwik': patch
+---
+
+fix: type casts to bridge Rollup vs Rolldown type differences without changing runtime behavior

packages/qwik/src/optimizer/src/plugins/rollup.ts

@@ -236,9 +236,12 @@ export async function normalizeRollupOutputOptionsObject(
     if (prevManualChunks && typeof prevManualChunks !== 'function') {
       throw new Error('manualChunks must be a function');
     }
+    // Casts bridge Rollup vs Rolldown ManualChunkMeta type differences
+    type ManualChunkFn = (id: string, meta: unknown) => string | void | null;
     outputOpts.manualChunks = prevManualChunks
-      ? (id, meta) => prevManualChunks(id, meta) || manualChunks(id, meta)
-      : manualChunks;
+      ? (id, meta) =>
+          (prevManualChunks as ManualChunkFn)(id, meta) || (manualChunks as ManualChunkFn)(id, meta)
+      : (manualChunks as Rollup.OutputOptions['manualChunks']);
   }
 
   if (!outputOpts.dir) {
@@ -272,7 +275,9 @@ export async function normalizeRollupOutputOptionsObject(
         Number.isFinite(major) &&
         (major > 4 || (major === 4 && (minor > 52 || (minor === 52 && (patch || 0) >= 0))));
       if (isGte452) {
-        outputOpts.onlyExplicitManualChunks = true;
+        (
+          outputOpts as Rollup.OutputOptions & { onlyExplicitManualChunks?: boolean }
+        ).onlyExplicitManualChunks = true;
       } else {
         console.warn(
           `⚠️ We detected that you're using a Rollup version prior to 4.52.0 (${version}). For the latest and greatest, we recommend to let Vite install the latest version for you, or manually install the latest version of Rollup in your project if that doesn't work. It will enable the new Rollup \`outputOpts.onlyExplicitManualChunks\` feature flag, which improves preloading performance and reduces cache invalidation for a snappier user experience.`