Initial commit: ElysiaJS backend + TanStack Start frontend + Traefik compose

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/.dockerignore

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+node_modules
+.git
+.env
+*.log

backend/Dockerfile

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+# --- Backend: ElysiaJS on Bun ---
+FROM oven/bun:1.1-alpine AS deps
+WORKDIR /app
+COPY package.json bun.lock* ./
+RUN bun install --production --frozen-lockfile || bun install --production
+
+FROM oven/bun:1.1-alpine AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+EXPOSE 3000
+# Lightweight healthcheck hitting the Elysia /api/health route.
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://127.0.0.1:3000/api/health || exit 1
+CMD ["bun", "run", "src/index.ts"]

backend/package.json

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+{
+  "name": "test-app-backend",
+  "version": "0.1.0",
+  "description": "ElysiaJS (Bun) backend for test-app-stack",
+  "type": "module",
+  "scripts": {
+    "dev": "bun run --watch src/index.ts",
+    "start": "bun run src/index.ts"
+  },
+  "dependencies": {
+    "elysia": "^1.1.27",
+    "@elysiajs/cors": "^1.1.1"
+  },
+  "devDependencies": {
+    "bun-types": "^1.1.34"
+  }
+}

backend/src/index.ts

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+import { Elysia, t } from "elysia";
+import { cors } from "@elysiajs/cors";
+
+const PORT = Number(process.env.PORT ?? 3000);
+
+// CORS: allow the frontend origin. In production set FRONTEND_ORIGIN to the
+// public frontend URL; defaults to "*" for local development convenience.
+const FRONTEND_ORIGIN = process.env.FRONTEND_ORIGIN ?? "*";
+
+const app = new Elysia()
+  .use(cors({ origin: FRONTEND_ORIGIN }))
+  .get("/", () => ({
+    service: "test-app-stack backend",
+    runtime: "ElysiaJS on Bun",
+    status: "ok",
+  }))
+  // Health probe used by Docker / Traefik / monitoring.
+  .get("/api/health", () => ({
+    status: "healthy",
+    timestamp: new Date().toISOString(),
+  }))
+  // Demo endpoint the frontend calls to prove the front<->back connection.
+  .get("/api/hello", ({ query }) => ({
+    message: `Hello${query.name ? `, ${query.name}` : ""} from ElysiaJS + Bun!`,
+    timestamp: new Date().toISOString(),
+  }), {
+    query: t.Object({ name: t.Optional(t.String()) }),
+  })
+  .listen(PORT);
+
+console.log(
+  `🦊 Backend running at http://${app.server?.hostname}:${app.server?.port}`,
+);
+
+export type App = typeof app;

backend/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "types": ["bun-types"],
+    "strict": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "allowImportingTsExtensions": true,
+    "noEmit": true
+  }
+}