A3Service (Nx + Expo + Nest)

This repo is an Nx (v22) monorepo containing:

• mobile (Expo SDK 54 app)
• api (NestJS 11 API)
• shared-schema (TypeScript contract library shared by both)

Prereqs

• Node.js 22+ (recommended)
• npm 10+
• Expo Go installed on your phone (for quick device testing)

Install

npm install

Backend (NestJS)

Build then run the compiled output:

npx nx build api
node dist/apps/api/main.js

The API should start at http://localhost:3000/api.

Frontend (Expo Go)

Start Metro via Nx:

npx nx start mobile

Then:

• open Expo Go on your phone
• scan the QR code shown in the terminal

Note: In an Nx monorepo, expo-doctor may warn about Metro projectRoot being the workspace root. Nx intentionally sets this for SDK 54+ monorepo module resolution.

Tests

npx nx test api
npx nx test mobile

(shared-schema currently has no test target.)

Useful Nx commands

npx nx show projects
npx nx graph
npx nx reset