1.4.1: nested pages dirs, CommonJS require of react in client bundles

- Page URL paths are now relative to src/pages. The old greedy
  `.*/pages/` cut mapped src/pages/admin/pages/index.tsx to /index, so
  every page under a nested `pages` directory collided with the home page
  and was never bundled. SSR also tells API routes by URL path now.
- CommonJS `require("react…")` in client bundles (for example
  use-sync-external-store/shim, pulled in by MUI) threw "Dynamic require
  of "react" is not supported" in the browser. Those requires now go
  through a small bundled ESM module that imports the external.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/utils/grab-all-pages.js

@@ -17,13 +17,9 @@ export default function grabAllPages(params) {
     }
     return pages;
 }
-function grabPageDirRecursively({ page_dir, include_server, }) {
+function grabPageDirRecursively({ page_dir, pages_root = page_dir, include_server, }) {
     const pages = readdirSync(page_dir);
     const pages_files = [];
-    const root_pages_file = grabPageFileObject({ file_path: `` });
-    if (root_pages_file) {
-        pages_files.push(root_pages_file);
-    }
     for (let i = 0; i < pages.length; i++) {
         const page = pages[i];
         const page_name = page.split("/").pop();
@@ -56,6 +52,7 @@ function grabPageDirRecursively({ page_dir, include_server, }) {
                 continue;
             const new_page_files = grabPageDirRecursively({
                 page_dir: full_page_path,
+                pages_root,
                 include_server,
             });
             pages_files.push(...new_page_files);
@@ -63,6 +60,7 @@ function grabPageDirRecursively({ page_dir, include_server, }) {
         else if (page.match(/\.(ts|js)x?$/)) {
             const pages_file = grabPageFileObject({
                 file_path: full_page_path,
+                pages_root,
             });
             if (pages_file) {
                 pages_files.push(pages_file);
@@ -77,14 +75,22 @@ function grabPageDirRecursively({ page_dir, include_server, }) {
         return 0;
     });
 }
-function grabPageFileObject({ file_path, }) {
-    let url_path = file_path
-        .replace(/.*\/pages\//, "/")
-        ?.replace(/\.(ts|js)x?$/, "");
-    let file_name = url_path.split("/").pop();
+/**
+ * The URL path is the file's path relative to the pages root, so a nested
+ * directory that happens to be called `pages` (e.g. `src/pages/admin/pages/
+ * index.tsx` -> `/admin/pages/index`) is kept, not treated as the root.
+ */
+export function grabPageFileObject({ file_path, pages_root, }) {
+    const relative_path = path
+        .relative(pages_root, file_path)
+        .split(path.sep)
+        .join("/");
+    if (!relative_path || relative_path.startsWith("../"))
+        return;
+    const url_path = "/" + relative_path.replace(/\.(ts|js)x?$/, "");
+    const file_name = url_path.split("/").pop();
     if (!file_name)
         return;
-    // const transformed_path = pagePathTransform({ page_path: file_path });
     return {
         local_path: file_path,
         url_path,