feat(deploy): run shared toolkit socket

vite.config.ts

@@ -1,7 +1,8 @@
 import path from 'node:path';
+import type { ServerResponse } from 'node:http';
 
 import react from '@vitejs/plugin-react';
-import { defineConfig } from 'vite';
+import { defineConfig, loadEnv, type PluginOption } from 'vite';
 
 import packageJson from './package.json';
 
@@ -17,25 +18,89 @@ const platformExtensions = [
   '.json',
 ];
 
-export default defineConfig({
-  define: {
-    'import.meta.env.VITE_APP_VERSION': JSON.stringify(packageJson.version),
-  },
-  plugins: [react()],
-  resolve: {
-    alias: [{ find: /^react-native$/, replacement: 'react-native-web' }],
-    dedupe: ['react', 'react-dom', 'react-native-web'],
-    extensions: platformExtensions,
-  },
-  optimizeDeps: {
-    exclude: ['react-native-safe-area-context'],
-  },
-  build: {
-    outDir: path.resolve(__dirname, 'dist/renderer'),
-    emptyOutDir: true,
-  },
-  server: {
-    host: '127.0.0.1',
-    port: 5173,
-  },
+const frontendHealthStartedAt = Date.now();
+const frontendHealthStartedAtIso = new Date(
+  frontendHealthStartedAt,
+).toISOString();
+
+function createFrontendHealthPayload() {
+  return {
+    ok: true,
+    service: 'blb-frontend',
+    version: packageJson.version,
+    startedAt: frontendHealthStartedAtIso,
+    timestamp: new Date().toISOString(),
+    uptimeSeconds: Math.max(
+      0,
+      Math.round((Date.now() - frontendHealthStartedAt) / 1000),
+    ),
+  };
+}
+
+function writeJsonResponse(
+  response: ServerResponse,
+  statusCode: number,
+  body: object,
+) {
+  response.writeHead(statusCode, {
+    'Cache-Control': 'no-store',
+    'Content-Type': 'application/json',
+  });
+  response.end(`${JSON.stringify(body)}\n`);
+}
+
+function frontendHealthPlugin(): PluginOption {
+  return {
+    name: 'blb-frontend-health',
+    configurePreviewServer(server) {
+      server.middlewares.use((request, response, next) => {
+        if (request.url?.split('?')[0] !== '/health') {
+          next();
+          return;
+        }
+
+        writeJsonResponse(response, 200, createFrontendHealthPayload());
+      });
+    },
+    configureServer(server) {
+      server.middlewares.use((request, response, next) => {
+        if (request.url?.split('?')[0] !== '/health') {
+          next();
+          return;
+        }
+
+        writeJsonResponse(response, 200, createFrontendHealthPayload());
+      });
+    },
+  };
+}
+
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, __dirname, '');
+  const toolkitSocketUrl =
+    env.VITE_TOOLKIT_SOCKET_URL ?? env.TOOLKIT_SOCKET_URL ?? '';
+
+  return {
+    define: {
+      __TOOLKIT_SOCKET_URL__: JSON.stringify(toolkitSocketUrl),
+      'import.meta.env.VITE_APP_VERSION': JSON.stringify(packageJson.version),
+    },
+    plugins: [frontendHealthPlugin(), react()],
+    resolve: {
+      alias: [{ find: /^react-native$/, replacement: 'react-native-web' }],
+      dedupe: ['react', 'react-dom', 'react-native-web'],
+      extensions: platformExtensions,
+    },
+    optimizeDeps: {
+      exclude: ['react-native-safe-area-context'],
+    },
+    build: {
+      outDir: path.resolve(__dirname, 'dist/renderer'),
+      emptyOutDir: true,
+    },
+    server: {
+      host: '127.0.0.1',
+      port: 5173,
+    },
+  };
 });