nestjs中环境变量区分环境信息

nestjs中使用config和cross-env分环境配置数据库信息等

首先下在两个包 config是一个作用在node环境的配置文件包，配置文件可以是json的格式 链接

npm i  config cross-env -D

新建文件config/development.json和config/production.json写入自己的数据库配置

//development.json
{
  "mysql": {
    "host": "localhost",
    "port": 3306,
    "username": "root",
    "password": "123456",
    "database": "note-one",
    "message": "This is a message from the development.json file"
  },
  "redis": {
    "url": "xx",
    "port": 6380,
    "password": "xx"
  }
}

在app.module中引入该配置文件，且使用

import * as config from "config";
export const mysqlConfig = config.get("mysql");
export const redisConfig = config.get("redis");




@Module({
  imports: [
    TypeOrmModule.forRoot({
      type: "mysql",
      host: mysqlConfig.host,
      port: mysqlConfig.port,
      username: mysqlConfig.username,
      password: mysqlConfig.password,
      database: mysqlConfig.database,
      entities: ["dist/modules/**/*.entity{.ts,.js}"],
      synchronize: true,
    }),

    RedisModule.forRoot({
      type: "single",
      url: redisConfig.url,
      options: {
        password: redisConfig.password,
      },
    }),
   
  ],
  controllers: [],
  providers: [],
})
export class AppModule {}

在package.json中，指定环境变量

"scripts": {

  "start:dev": "cross-env NODE_ENV=development nest start --watch",
  "start:debug": "nest start --debug --watch",
  "start:prod": "cross-env NODE_ENV=production  node dist/main",
  "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix", 
}