Only generate types for route modules in a projects app directory

packages/react-router-dev/typegen/index.ts

@@ -9,6 +9,7 @@ import { createConfigLoader } from "../config/config";
 import { generate } from "./generate";
 import type { Context } from "./context";
 import { getTypesDir, getTypesPath } from "./paths";
+import type { RouteManifestEntry } from "../config/routes";
 
 export async function run(rootDirectory: string) {
   const ctx = await createContext({ rootDirectory, watch: false });
@@ -71,14 +72,27 @@ async function createContext({
   };
 }
 
+function isRouteInAppDirectory(ctx: Context, route: RouteManifestEntry) {
+  const absoluteRoutePath = Path.isAbsolute(route.file)
+    ? route.file
+    : Path.resolve(ctx.config.appDirectory, route.file);
+
+  return absoluteRoutePath.startsWith(ctx.config.appDirectory);
+}
+
 async function writeAll(ctx: Context): Promise<void> {
   const typegenDir = getTypesDir(ctx);
 
   fs.rmSync(typegenDir, { recursive: true, force: true });
-  Object.values(ctx.config.routes).forEach((route) => {
-    const typesPath = getTypesPath(ctx, route);
-    const content = generate(ctx, route);
-    fs.mkdirSync(Path.dirname(typesPath), { recursive: true });
-    fs.writeFileSync(typesPath, content);
-  });
+  Object.values(ctx.config.routes)
+    .filter((route) => {
+      // Only generate types for routes in the app directory
+      return isRouteInAppDirectory(ctx, route);
+    })
+    .forEach((route) => {
+      const typesPath = getTypesPath(ctx, route);
+      const content = generate(ctx, route);
+      fs.mkdirSync(Path.dirname(typesPath), { recursive: true });
+      fs.writeFileSync(typesPath, content);
+    });
 }