[FileSystemRouter] Fix reload()

src/bun.js/api/filesystem_router.zig

@@ -320,7 +320,7 @@ pub const FileSystemRouter = struct {
         };
 
         var router = Router.init(vm.bundler.fs, allocator, .{
-            .dir = this.router.config.dir,
+            .dir = allocator.dupe(u8, this.router.config.dir) catch unreachable,
             .extensions = allocator.dupe(string, this.router.config.extensions) catch unreachable,
             .asset_prefix_path = this.router.config.asset_prefix_path,
         }) catch unreachable;
@@ -338,6 +338,7 @@ pub const FileSystemRouter = struct {
         this.arena = arena;
         @This().routesSetCached(this_value, globalThis, JSC.JSValue.zero);
         this.allocator = allocator;
+        this.router = router;
         return this_value;
     }
 

test/bun.js/filesystem_router.test.ts

@@ -349,6 +349,22 @@ it(".query works", () => {
   }
 });
 
+it("reload() works", () => {
+  // set up the test
+  const { dir } = make(["posts.tsx"]);
+
+  const router = new Bun.FileSystemRouter({
+    dir,
+    style: "nextjs",
+    assetPrefix: "/_next/static/",
+    origin: "https://nextjs.org",
+  });
+
+  expect(router.match("/posts").name).toBe("/posts");
+  router.reload();
+  expect(router.match("/posts").name).toBe("/posts");
+});
+
 it(".query works with dynamic routes, including params", () => {
   // set up the test
   const { dir } = make(["posts/[id].tsx"]);