Fix issue with macstats on mac

ui/src/server/macstats.ts

@@ -0,0 +1,38 @@
+import * as nodeModule from 'module';
+import os from 'os';
+import path from 'path';
+
+/**
+ * macstats is a native, macOS-only optional dependency.
+ *
+ * It must not be bundled. Webpack special-cases `createRequire(...)`: with a literal base it
+ * resolves and inlines the module (a hard MODULE_NOT_FOUND throw when it can't), and with a
+ * computed base it replaces the whole call with `void 0` — both leave macstats unreachable at
+ * runtime even when it is installed, regardless of serverExternalPackages/externals. So look
+ * createRequire up dynamically, where the bundler can't recognize it, and base the require on
+ * process.cwd() (the ui/ directory the Next server runs in) so it resolves against
+ * ui/node_modules at runtime.
+ */
+
+// undefined = not tried yet, null = unavailable on this machine
+let cachedModule: any | null | undefined;
+
+export function loadMacstats(): any | null {
+  if (cachedModule !== undefined) return cachedModule;
+
+  if (os.platform() !== 'darwin') {
+    cachedModule = null;
+    return cachedModule;
+  }
+
+  try {
+    const createRequire = (nodeModule as any)['create' + 'Require'] as typeof nodeModule.createRequire;
+    const nativeRequire = createRequire(path.join(process.cwd(), 'package.json'));
+    cachedModule = nativeRequire('macstats');
+  } catch (error) {
+    console.warn('macstats not available:', error);
+    cachedModule = null;
+  }
+
+  return cachedModule;
+}