From 4d89e3155b1c05f738de20bd66f15ecc51fb5b81 Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@roe.dev>
Date: Sat, 4 Feb 2023 10:00:16 -0800
Subject: [PATCH] fix(vercel): allow non-glob cache rules to apply to `/`
 (#908)

---
 src/presets/vercel.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/presets/vercel.ts b/src/presets/vercel.ts
index d2be2fea22..5a76e038d0 100644
--- a/src/presets/vercel.ts
+++ b/src/presets/vercel.ts
@@ -190,6 +190,15 @@ function generateBuildConfig(nitro: Nitro) {
             dest: generateEndpoint(key) + "?url=$url",
           };
         }),
+      // If we are using a prerender function for /, then we need to write this explicitly
+      ...(nitro.options.routeRules["/"]?.cache
+        ? [
+            {
+              src: "(?<url>/)",
+              dest: "/__nitro-index",
+            },
+          ]
+        : []),
       // If we are using a prerender function as a fallback, then we do not need to output
       // the below fallback route as well
       ...(!nitro.options.routeRules["/**"]?.cache ||
@@ -209,6 +218,9 @@ function generateBuildConfig(nitro: Nitro) {
 }
 
 function generateEndpoint(url: string) {
+  if (url === "/") {
+    return "/__nitro-index";
+  }
   return url.includes("/**")
     ? "/__nitro-" +
         withoutLeadingSlash(url.replace(/\/\*\*.*/, "").replace(/[^a-z]/g, "-"))