diff --git a/integration/vite-adapter-test.ts b/integration/vite-adapter-test.ts
index 470e4774d2..e0de11fa6a 100644
--- a/integration/vite-adapter-test.ts
+++ b/integration/vite-adapter-test.ts
@@ -38,7 +38,18 @@ test.describe(async () => {
               },
               async buildEnd(args) {
                 let fs = await import("node:fs/promises");
-                await fs.writeFile("BUILD_END_ARGS.json", JSON.stringify(args, null, 2), "utf-8");
+                await fs.writeFile(
+                  "BUILD_END_ARGS.json",
+                  JSON.stringify(
+                    args,
+                    function replacer(key, value) {
+                      return typeof value === "function"
+                        ? value.toString()
+                        : value;
+                    },
+                    2,
+                  ),
+                  "utf-8");
               }
             }),
             
@@ -68,34 +79,45 @@ test.describe(async () => {
     // Rewrite path args to be relative and normalized for snapshot test
     remixConfig.buildDirectory = relativeToCwd(remixConfig.buildDirectory);
 
-    expect(buildEndArgs).toEqual({
-      remixConfig: {
-        buildDirectory: "build",
-        serverBuildFile: "index.js",
-        unstable_ssr: true,
+    expect(Object.keys(buildEndArgs)).toEqual(["buildManifest", "remixConfig"]);
+
+    // Smoke test the resolved config
+    expect(Object.keys(buildEndArgs.remixConfig)).toEqual([
+      "adapter",
+      "appDirectory",
+      "buildDirectory",
+      "future",
+      "manifest",
+      "publicPath",
+      "routes",
+      "serverBuildFile",
+      "serverBundles",
+      "serverModuleFormat",
+      "unstable_ssr",
+    ]);
+
+    // Ensure we get a valid build manifest
+    expect(buildEndArgs.buildManifest).toEqual({
+      routeIdToServerBundleId: {
+        "routes/_index": "user-options--adapter-options",
       },
-      buildManifest: {
-        routeIdToServerBundleId: {
-          "routes/_index": "user-options--adapter-options",
+      routes: {
+        root: {
+          file: "app/root.tsx",
+          id: "root",
+          path: "",
         },
-        routes: {
-          root: {
-            file: "app/root.tsx",
-            id: "root",
-            path: "",
-          },
-          "routes/_index": {
-            file: "app/routes/_index.tsx",
-            id: "routes/_index",
-            index: true,
-            parentId: "root",
-          },
+        "routes/_index": {
+          file: "app/routes/_index.tsx",
+          id: "routes/_index",
+          index: true,
+          parentId: "root",
         },
-        serverBundles: {
-          "user-options--adapter-options": {
-            file: "build/server/user-options--adapter-options/index.js",
-            id: "user-options--adapter-options",
-          },
+      },
+      serverBundles: {
+        "user-options--adapter-options": {
+          file: "build/server/user-options--adapter-options/index.js",
+          id: "user-options--adapter-options",
         },
       },
     });
diff --git a/packages/remix-dev/vite/build.ts b/packages/remix-dev/vite/build.ts
index c5f58cc81b..2c7618f910 100644
--- a/packages/remix-dev/vite/build.ts
+++ b/packages/remix-dev/vite/build.ts
@@ -289,14 +289,8 @@ export async function build(
     );
   }
 
-  let { buildDirectory, serverBuildFile, ssr } = remixConfig;
-
   await remixConfig.adapter?.buildEnd?.({
     buildManifest,
-    remixConfig: {
-      buildDirectory,
-      serverBuildFile,
-      unstable_ssr: ssr,
-    },
+    remixConfig,
   });
 }
diff --git a/packages/remix-dev/vite/plugin.ts b/packages/remix-dev/vite/plugin.ts
index 412968269e..3cf6b151bf 100644
--- a/packages/remix-dev/vite/plugin.ts
+++ b/packages/remix-dev/vite/plugin.ts
@@ -175,10 +175,7 @@ export type VitePluginConfig = RemixEsbuildUserConfigJsdocOverrides &
   };
 
 type BuildEndHook = (args: {
-  remixConfig: Pick<
-    ResolvedVitePluginConfig,
-    "buildDirectory" | "serverBuildFile"
-  > & { unstable_ssr: boolean };
+  remixConfig: ResolvedVitePluginConfig;
   buildManifest: BuildManifest | undefined;
 }) => void | Promise<void>;
 
@@ -191,7 +188,7 @@ export type ResolvedVitePluginConfig = Pick<
   manifest: boolean;
   serverBuildFile: string;
   serverBundles?: ServerBundlesFunction;
-  ssr: boolean;
+  unstable_ssr: boolean;
 };
 
 export type ServerBundleBuildConfig = {
@@ -473,9 +470,8 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
     let rootDirectory =
       viteUserConfig.root ?? process.env.REMIX_ROOT ?? process.cwd();
 
-    let { manifest, unstable_ssr: ssr } = resolvedRemixUserConfig;
-
-    let isSpaMode = !ssr;
+    let { manifest, unstable_ssr } = resolvedRemixUserConfig;
+    let isSpaMode = !unstable_ssr;
 
     // Only select the Remix esbuild config options that the Vite plugin uses
     let {
@@ -531,7 +527,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
       serverBuildFile,
       serverBundles,
       serverModuleFormat,
-      ssr,
+      unstable_ssr,
     };
 
     let serverContext: RemixPluginServerContext =
@@ -579,7 +575,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
         )
       )};
       export const future = ${JSON.stringify(ctx.remixConfig.future)};
-      export const isSpaMode = ${!ctx.remixConfig.ssr};
+      export const isSpaMode = ${!ctx.remixConfig.unstable_ssr};
       export const publicPath = ${JSON.stringify(ctx.remixConfig.publicPath)};
       export const entry = { module: entryServer };
       export const routes = {
@@ -1093,7 +1089,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
             );
           }
 
-          if (!ctx.remixConfig.ssr) {
+          if (!ctx.remixConfig.unstable_ssr) {
             await handleSpaMode(
               serverBuildDirectory,
               ctx.remixConfig.serverBuildFile,
@@ -1234,7 +1230,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
         let route = getRoute(ctx.remixConfig, id);
         if (!route) return;
 
-        if (!ctx.remixConfig.ssr) {
+        if (!ctx.remixConfig.unstable_ssr) {
           let serverOnlyExports = esModuleLexer(code)[1]
             .map((exp) => exp.n)
             .filter((exp) => SERVER_ONLY_ROUTE_EXPORTS.includes(exp));