feat: mutable route tree (#9996)

* initial work + test outline

* wip: addRoute,updateRoute,deleteRoute

* refactor(hmr): internal api for updating routes and revalidating

* refactor: _internalSetRoutes

* test: update method name after rename

* revalidate in tests

* chore: remove data for routes with no loader
test: cover navigation interruption

* add changeset

* Add a couple more tests

* Fix invalid useRouteLoaderData test

* Handle HMR use cases for revalidating fetchers

* Bump bundle

---------

Co-authored-by: Pedro Cattori <pcattori@gmail.com>
Co-authored-by: Matt Brophy <matt@brophy.org>

.changeset/quick-yaks-join.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/router": patch
+---
+
+Add internal API for custom HMR implementations

package.json

@@ -105,7 +105,7 @@
   },
   "filesize": {
     "packages/router/dist/router.umd.min.js": {
-      "none": "41.5 kB"
+      "none": "41.6 kB"
     },
     "packages/react-router/dist/react-router.production.min.js": {
       "none": "13 kB"

packages/react-router-dom/server.tsx

@@ -307,6 +307,9 @@ export function createStaticRouter(
     },
     _internalFetchControllers: new Map(),
     _internalActiveDeferreds: new Map(),
+    _internalSetRoutes() {
+      throw msg("_internalSetRoutes");
+    },
   };
 }
 

packages/react-router/__tests__/data-memory-router-test.tsx

@@ -821,7 +821,6 @@ describe("<DataMemoryRouter>", () => {
         initialEntries={["/foo"]}
         hydrationData={{
           loaderData: {
-            layout: null,
             foo: "FOO",
           },
         }}
@@ -861,7 +860,7 @@ describe("<DataMemoryRouter>", () => {
     }
 
     expect(spy).toHaveBeenCalledWith({
-      layout: null,
+      layout: undefined,
       foo: "FOO",
       bar: undefined,
       child: undefined,
@@ -896,7 +895,7 @@ describe("<DataMemoryRouter>", () => {
       </div>"
     `);
     expect(spy).toHaveBeenCalledWith({
-      layout: null,
+      layout: undefined,
       foo: undefined,
       bar: undefined,
       child: "CHILD",