目的

读取环境变量 → 全模块可读取

pnpm i @nestjs/config

/.env

APP_ENV=development
APP_PORT=3000
DB_URL=mongodb://mongo:27017
DB_NAME=nest-server
DB_USER=xxxx
DB_PASS=123456
DB_ENTITY_NAME=mongo
DB_SYNCHRONIZE=false
DB_LOGGING=true

/src/shared/configs/configuration.ts

export default (): any => ({
  env: process.env.APP_ENV,
  port: process.env.APP_PORT,
  database: {
    url: process.env.DB_URL,
    name: process.env.DB_NAME,
    user: process.env.DB_USER,
    pass: process.env.DB_PASS,
    synchronize: process.env.DB_SYNCHRONIZE,
    logging: process.env.DB_LOGGING
  },
});

/src/configs/module-options.ts

// import * as Joi from '@hapi/joi';
import { ConfigModuleOptions } from '@nestjs/config/dist/interfaces';

import configuration from './configuration';

export const configModuleOptions: ConfigModuleOptions = {
  envFilePath: '.env',
  load: [configuration],
};

/src/shared.module.ts

import { Module } from '@nestjs/common';
import { SystemService } from './system.service';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { configModuleOptions } from './configs/module-options';

@Module({
    // 注入Config
    imports: [
        ConfigModule.forRoot(configModuleOptions),
    ],
     
    // 暴露Config
    exports: [
      ConfigModule,
    ]
    
})
export class ShareModule { }

使用 ConfigService

export class UserController {
  constructor(
    private readonly userService: UserService,
    private readonly configService: ConfigService
  ) { }

  create(@Body() createUserDto: CreateUserDto) {

    // ....
    console.log('ENV:URL:', this.configService.get<string>('database.url'))
    // ....
  }
}