使用Typescript开发node.js项目

npm init

npm install --save-dev typescript

npm install --save-dev nodemon

npm install --save-dev ts-node

npm install --save-dev @types/koa


npm install --save koa

{
  "name": "learn-ts",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "nodemon -x ts-node --inspect app.ts",
    "start": "node dist/app.js",
    "build": "tsc "
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@types/koa": "^2.0.46",
    "nodemon": "^1.17.5",
    "ts-node": "^6.1.0",
    "typescript": "^2.9.1"
  },
  "dependencies": {
    "koa": "^2.5.1"
  }
}

tsc --init

{
  "compilerOptions": {
    "outDir": "./dist/",
    "module": "commonjs",
    "noImplicitAny": true,
    "preserveConstEnums": true,
    "sourceMap": true,
    "target": "es5",
    "allowJs": true
  }
}

import * as Koa from 'koa'

const app = new Koa()

app.use(ctx => {
  ctx.body = 'xiadd'
})

app.listen(8002, () => {
  console.log('server is running')
})

npm run build

npm run start

nodemon --ext js,ts --exec ts-node dist/app

./run.sh

class info{
    constructor(public name:string,private password:string,email:string){
    }
}

var info = /** @class */ (function () {
    function info(name, password, email) {
        this.name = name;
        this.password = password;
    }
    return info;
}());