$ npm install
# development
$ npm run start
# watch mode
$ npm run start:dev
# production mode
$ npm run start:prod
# unit tests
$ npm run test
# e2e tests
$ npm run test:e2e
# test coverage
$ npm run test:cov
nest g controller <控制器名称>
npm install @types/express
nest g service <服务类名称>
nest g module <模块名称>