nest项目创建

js
文档：https://docs.nestjs.com/
$ npm i -g @nestjs/cli
$ nest new project-name

1.使用@nestjs/config

js
pnpm i @nestjs/config croess-env dotenv


app.module.ts中使用
import { Module } from '@nestjs/common';
import { UserModule } from './user/user.module';
import { ConfigModule } from '@nestjs/config';
import * as dotenv from 'dotenv';

const envFilePath = `.env.${process.env.NODE_ENV || 'dev'}`;
@Module({
  imports: [
    UserModule,
    ConfigModule.forRoot({
      isGlobal: true,
      envFilePath,
      load: [() => dotenv.config({ path: '.env' })],
    }),
  ],
  providers: [],
})
export class AppModule {}

创建.env 配置文件
root=dev

创建enum文件夹配置config.enum.ts文件
export enum ConfigEnum {
  DB_HOST = 'DB_HOST',
  DB_PORT = 'DB_PORT',
  DB_USERNAME = 'DB_USERNAME',
  DB_PASSWORD = 'DB_PASSWORD',
  DB_DATABASE = 'DB_DATABASE',
  ROOT = 'root',
}

使用
import { ConfigService } from '@nestjs/config';
console.log(this.configService.get(ConfigEnum.ROOT));


package.json中使用
"start:prod": "cross-env NODE_ENV=prod nest start --watch",

2当配置文件过多

js
使用 pnpm i js-yaml @types/js-yaml lodash cross-env @nestjs/config


1.创建configuration.ts配置文件用于加载config中配置
import { readFileSync } from 'node:fs';
import * as yaml from 'js-yaml';
import * as path from 'node:path';
import * as _ from 'lodash';
// 读取配置默认配置文件名称
const YAML_CONFIG_FILENAME_DEFAULT = 'env.yml';
const YAML_FILE_PATH_DEFAULT = path.resolve(
  __dirname,
  '../config',
  YAML_CONFIG_FILENAME_DEFAULT,
);
//读取当前运行环境配置文件
const env = process.env.NODE_ENV;
const YAML_FILE_PATH_ENV = path.resolve(
  __dirname,
  '../config',
  `env.${env}.yml`,
);

const comonConfig = yaml.load(readFileSync(YAML_FILE_PATH_DEFAULT, 'utf8'));
const envConfig = yaml.load(readFileSync(YAML_FILE_PATH_ENV, 'utf8'));

export default (): any => _.merge(comonConfig, envConfig);






2.app.module.ts中使用
import { Module } from '@nestjs/common';
import { UserModule } from './user/user.module';
import { ConfigModule } from '@nestjs/config';
import Configuration from './configuration';
console.log('print ~ Configuration:', Configuration);
// const envFilePath = `.env.${process.env.NODE_ENV || 'dev'}`;
@Module({
  imports: [
    UserModule,
    ConfigModule.forRoot({
      isGlobal: true,
      // envFilePath,
      load: [Configuration],
    }),
  ],
})
export class AppModule {}

3.创建config文件夹,env.yml

DB:
  host: 127.0.0.1
  port: 3306
  username: root
  password: root

4.package.json中使用
"start:prod": "cross-env NODE_ENV=prod nest start --watch",


5.使用
import { ConfigService } from '@nestjs/config';
console.log(this.configService.get(DB));