Using Cloudflare workers

const config = defineConfig({
  define: {
    __APP_VERSION__: JSON.stringify(pkg.version),
  },
  plugins: [
    devtools(),
    // this is the plugin that enables path aliases
    viteTsConfigPaths({
      projects: ['./tsconfig.json'],
    }),
    tailwindcss(),
    tanstackStart(),
    viteReact(),
    // Cloudflare must come AFTER tanstackStart
    cloudflare({ viteEnvironment: { name: 'ssr' } }),
  ],
  // Exclude TanStack Start virtual modules from dependency optimization
// Also tried without this
  optimizeDeps: {
    exclude: [
      '@tanstack/react-start',
      '@tanstack/start-server-core',
      '@tanstack/react-start/server',
      '@tanstack/react-router-ssr-query',
    ],
  },
// Also tried without this)
  ssr: {
    // Don't externalize these - let Vite bundle them
    noExternal: [
      '@tanstack/react-router-ssr-query',
    ],
  },
  test: {
    globals: true,
    environment: 'jsdom',
    setupFiles: ['./src/tests/test-setup.ts'],
  },
})

export default config

import { neonConfig } from "@neondatabase/serverless";
import { PrismaNeon } from "@prisma/adapter-neon";

// Uses HTTP fetch instead of WebSockets - more reliable on edge
neonConfig.poolQueryViaFetch = true;

const adapter = new PrismaNeon({
    connectionString: process.env.DATABASE_URL,
});

declare global {
    var __prisma: PrismaClient | undefined;
}

export const prisma = globalThis.__prisma || new PrismaClient({ adapter });

if (process.env.NODE_ENV !== "production") {
    globalThis.__prisma = prisma;
}

import { betterAuth } from "better-auth";
import { prismaAdapter } from "better-auth/adapters/prisma";
import { tanstackStartCookies } from "better-auth/tanstack-start";

import { prisma } from "@/db";

export const auth = betterAuth({
    database: prismaAdapter(prisma, {
        provider: "postgresql",
    }),
    emailAndPassword: {
        enabled: true,
    },
    secret: process.env.BETTER_AUTH_SECRET || "",
    plugins: [tanstackStartCookies()], // make sure this is the last plugin in the array
});