✨ feat: initial app

apps/api/package.json

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+{
+  "name": "@pien-studio/api",
+  "private": true,
+  "scripts": {
+    "dev": "bun --watch src/index.ts",
+    "build": "bun build src/index.ts --outdir dist",
+    "start": "bun run dist/index.js",
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@pien-studio/types": "workspace:*",
+    "elysia": "^1.1.25",
+    "zod": "^4.4.3"
+  },
+  "devDependencies": {
+    "bun-types": "latest",
+    "typescript": "^6.0.3",
+    "vitest": "^4.1.5"
+  }
+}

apps/api/src/index.test.ts

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+import { describe, expect, it } from "vitest";
+import { createApp } from "./index";
+
+describe("api endpoints", () => {
+  it("returns root route info", async () => {
+    const app = createApp();
+    const response = await app.handle(new Request("http://localhost/"));
+    const body = await response.json();
+    expect(response.status).toBe(200);
+    expect(body.name).toBe("pien-api");
+  });
+
+  it("returns healthy status", async () => {
+    const app = createApp();
+    const response = await app.handle(new Request("http://localhost/health"));
+    const body = await response.json();
+    expect(response.status).toBe(200);
+    expect(body.ok).toBe(true);
+  });
+
+  it("returns token for valid device payload", async () => {
+    const app = createApp();
+    const response = await app.handle(
+      new Request("http://localhost/auth/device", {
+        method: "POST",
+        headers: { "content-type": "application/json" },
+        body: JSON.stringify({ deviceId: "dev1234", locale: "en" }),
+      }),
+    );
+    const body = await response.json();
+    expect(response.status).toBe(200);
+    expect(body.token).toBe("dev_dev1234");
+  });
+});

apps/api/src/index.ts

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+import { Elysia } from "elysia";
+import { DeviceSessionSchema } from "@pien-studio/types";
+
+export function createApp() {
+  return new Elysia()
+    .get("/", () => ({
+      name: "pien-api",
+      status: "ok",
+    }))
+    .get("/health", () => ({ ok: true, service: "pien-api" }))
+    .post("/auth/device", ({ body }) => {
+      const parsed = DeviceSessionSchema.safeParse(body);
+      if (!parsed.success) {
+        return new Response(JSON.stringify({ error: "invalid_device_payload" }), {
+          status: 400,
+        });
+      }
+      return {
+        token: `dev_${parsed.data.deviceId}`,
+        scope: "local-sync",
+      };
+    })
+    .get("/sync/bootstrap", () => ({
+      replication: {
+        pull: "/sync/pull",
+        push: "/sync/push",
+        strategy: "couch-compatible",
+      },
+    }));
+}
+
+if (import.meta.main) {
+  createApp().listen(4000);
+  console.log("pien api listening on http://localhost:4000");
+}

apps/api/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "types": ["bun-types"]
+  },
+  "include": ["src/**/*.ts"]
+}

apps/api/vitest.config.ts

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+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    include: ["**/*.test.ts"],
+  },
+});