第十四章：模块化 —— 一座成熟中枢不会把所有传送带焊在一个文件里

app/
├── app.js
├── plugins/
│   ├── db.js
│   ├── auth.js
│   └── docs.js
├── routes/
│   ├── shipments.js
│   ├── warehouses.js
│   └── health.js
├── schemas/
│   └── shipment.js
└── services/
    └── shipment-service.js

export default async function dbPlugin (fastify) {
  fastify.decorate('db', {
    async findShipmentById (id) {
      return { id, status: 'stored' }
    }
  })
}

export default async function shipmentRoutes (fastify) {
  fastify.get('/shipments/:id', async function (request) {
    return this.db.findShipmentById(request.params.id)
  })
}

import Fastify from 'fastify'
import dbPlugin from './plugins/db.js'
import shipmentRoutes from './routes/shipments.js'

const app = Fastify({ logger: true })

await app.register(dbPlugin)
await app.register(shipmentRoutes, { prefix: '/api' })

await app.listen({ port: 3000, host: '0.0.0.0' })