# nest-study

**Repository Path**: yin-chunyang/nest-study

## Basic Information

- **Project Name**: nest-study
- **Description**: nest学习仓库，文字限制什么啊
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2024-12-17
- **Last Updated**: 2025-06-15

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# nestjs顺序
- `Request`=>`Middleware`=>`Guard`=>`Pipe`=>`Before Interceptor`=>`Router handler`=>`After Interceptor`=>`Exception filter`=>`Response`
- 请求 => 中间件 => 守卫 => 管道 => 拦截器前 => 路由处理请求 => 拦截器后 => 异常过滤器 => 响应

# 配置热更新

nodemon插件

在根目录添加`nodemon.json`配置热更新信息

```json
{
    "watch":["./*"],
    "ext":"ts,js,json",
    "ignore":["node_modules"]
}
```

- watch 监听那个文件变化
- ext 监听什么文件
- ignore 忽略那些文件

# package-script脚本和tsconfig

用于源码和node_modules切换测试

```json
{
  "compilerOptions": {
    "experimentalDecorators": true,         //支持stage0，1，2
    "emitDecoratorMetadata": true,          // 支持stage0,1,2
    // stage3 注释掉 experimentalDecorators emitDecoratorMetadata，设置编辑器ts检索服务为node_modules安装的版本
    // vscode：`文件->首选项->设置->搜索tsdk->输入框内改为./node_modules/typescript/lib`
    "target":"ES2021",
    // "target":"ESNext",
    "moduleResolution": "NodeNext",
    "module": "NodeNext",
    "types": ["node"],
    "baseUrl":"./",
    "paths":{
      "@nestjs/*":["@nestjs/*"]
    }
  }
}
```

- baseUrl 基本地址基于那个路径
- paths 里边配置在引入资源时匹配的替换为对应的值路径

## 需要在package中添加命令

`"dev03:dev": "nodemon ./03_controllers/src/main.ts"`

这个命令表示运行该文件夹的项目，不会解析`tsconfig.json`;在运行时注释tsconfig,json中的`baseUrl`,`paths['@nestjs/*']`

---

`"dev03:dev-tsconfig": "nodemon -r tsconfig-paths/register ./03_controllers/src/main.ts"`

这个命令表示运行非node_module当中的@nestjs/**, 运行tsconfig.json配置的`paths:{"@nestjs/*":["src/@nestjs/*"]}`


```json
{
  "name": "01_starter",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev01": "ts-node ./01_starter/src/main.ts",
    "dev03": "ts-node ./03_controllers/src/main.ts",
    "dev03:dev": "nodemon ./03_controllers/src/main.ts",
    "dev03:dev-tsconfig": "nodemon -r tsconfig-paths/register ./03_controllers/src/main.ts",
    "dev04": "ts-node ./04_stage3/src/main.ts",
    "dev04:dev": "nodemon ./04_stage3/src/main.ts",
    "dev04:dev-tsconfig": "nodemon -r tsconfig-paths/register ./04_stage3/src/main.ts",
    "dev06:dev": "nodemon ./06_providers/src/main.ts",
    "dev06:dev-tsconfig": "nodemon -r tsconfig-paths/register ./06_providers/src/main.ts",
    "dev07:dev": "nodemon ./07_Modules/src/main.ts",
    "dev07:dev-tsconfig": "nodemon -r tsconfig-paths/register ./07_Modules/src/main.ts"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@nestjs/common": "^10.4.15",
    "@nestjs/core": "^10.4.15",
    "@nestjs/platform-express": "^10.4.15",
    "@types/node": "^22.10.2",
    "cli-color": "^2.0.4",
    "express": "^4.21.2",
    "express-session": "^1.18.1",
    "nodemon": "^3.1.9",
    "os": "^0.1.2",
    "reflect-metadata": "^0.2.2",
    "rxjs": "^7.8.1",
    "ts-node": "^10.9.2",
    "typescript": "^5.7.2"
  },
  "devDependencies": {
    "tsconfig-paths": "^4.2.0"
  }
}
```
## typescript检查服务

编辑器的ts检查jdk切换可点击编辑器右下角 `{}` 符号根据指引切换

通常都是按照node_modules内`typescript`包的版本

## 新老版本装饰器stage3装饰器

新版本装饰器切换typescript版本5.x+

tsconfig.json注释掉experimentalDecorators、emitDecoratorMetadata或设置false