Add partialFallback field (#39)

Author: ijjk

.changeset/clever-geckos-float.md

@@ -0,0 +1,5 @@
+---
+"@next-community/adapter-vercel": patch
+---
+
+Update `@vercel/build-utils` to `13.6.2` and include `partialFallback` in prerender config output.

packages/adapter/package.json

@@ -20,14 +20,14 @@
     "@types/node": "14.18.33",
     "@types/picomatch": "2.3.3",
     "@types/webpack-sources": "3.2.0",
-    "@vercel/build-utils": "12.2.2",
+    "@vercel/build-utils": "13.6.2",
     "@vercel/routing-utils": "5.2.1",
     "async-sema": "3.1.1",
     "bytes": "3.1.2",
     "convert-source-map": "1.8.0",
     "esbuild": "0.25.10",
     "fs-extra": "11.2.0",
-    "next": "16.2.0-canary.29",
+    "next": "16.2.0-canary.79",
     "picomatch": "4.0.1",
     "source-map": "0.7.4",
     "webpack-sources": "3.2.3"

packages/adapter/src/outputs.ts

@@ -254,7 +254,6 @@ async function writeDeterministicRoutesManifest(distDir: string) {
   );
 
   manifest.headers = [];
-  // @ts-expect-error only recently added
   manifest.onMatchHeaders = [];
   delete manifest.deploymentId;
 
@@ -600,6 +599,7 @@ export async function handlePrerenderOutputs(
               passQuery: true,
               allowQuery: output.config.allowQuery,
               allowHeader: output.config.allowHeader,
+              partialFallback: output.config.partialFallback || undefined,
 
               bypassToken: output.config.bypassToken,
               experimentalBypassFor: output.config.bypassFor,