Fix issue with macstats on mac

ui/src/app/api/cpu/route.ts

@@ -1,9 +1,9 @@
 import { NextResponse } from 'next/server';
 import si from 'systeminformation';
-import { createRequire } from 'module';
 import os from 'os';
 import { CpuInfo } from '@/types';
 import { cached } from '@/server/apiCache';
+import { loadMacstats } from '@/server/macstats';
 
 const isMac = os.platform() === 'darwin';
 
@@ -13,8 +13,8 @@ async function getCpuInfo(): Promise<CpuInfo> {
 
   if (isMac) {
     try {
-      const nativeRequire = createRequire(import.meta.url);
-      const ms = nativeRequire('macstats') as any;
+      const ms = loadMacstats();
+      if (!ms) throw new Error('macstats unavailable');
       const ramData = ms.getRAMUsageSync();
       const cpuData = ms.getCpuDataSync();
 

ui/src/app/api/gpu/route.ts

@@ -1,9 +1,9 @@
 import { NextResponse } from 'next/server';
 import { exec } from 'child_process';
 import { promisify } from 'util';
-import { createRequire } from 'module';
 import os from 'os';
 import { cached } from '@/server/apiCache';
+import { loadMacstats } from '@/server/macstats';
 
 const execAsync = promisify(exec);
 
@@ -47,11 +47,8 @@ async function getMacGpuInfo(): Promise<MacGpuResult | null> {
     let memUsed = 0;
     let memTotal = memoryTotal;
 
-    try {
-      // Use createRequire to hide from webpack static analysis so it doesn't fail on non-mac platforms
-      const nativeRequire = createRequire(import.meta.url);
-      const ms = nativeRequire('macstats') as any;
-
+    const ms = loadMacstats();
+    if (ms) {
       try {
         const gpuData = ms.getGpuDataSync();
         temperature = gpuData.temperature || 0;
@@ -84,8 +81,6 @@ async function getMacGpuInfo(): Promise<MacGpuResult | null> {
       } catch {
         // ignore
       }
-    } catch (error) {
-      console.warn('macstats not available:', error);
     }
 
     return { name: gpuName, memUsed, memTotal, gpuLoad, temperature, fanSpeed, powerDraw };

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;
+}