使用rollup打包TS文件
安装依赖：
全局安装rollup npm install rollup-g
安装TypeScript npm install typescript -D
安装TypeScript 转换器 npm install rollup-plugin-typescript2 -D
安装代码压缩插件 npm install rollup-plugin-terser -D
安装rollupweb服务 npm install rollup-plugin-serve -D
安装热更新 npm install rollup-plugin-livereload -D
安装配置环境变量用来区分本地和生产 npm install cross-env -D
步骤：

 1.安装依赖

 2.npm init -y 创建配置package.json文件

 3.创建 src public rollup.config.js文件

 4.配置 rollup.config.js

package.json文件：

{
  "name": "rollupTs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "cross-env NODE_ENV=production rollup -c",
    "dev": "cross-env NODE_ENV=development rollup -c"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "cross-env": "^7.0.3",
    "rollup-plugin-livereload": "^2.0.5",
    "rollup-plugin-node-resolve": "^5.2.0",
    "rollup-plugin-replace": "^2.2.0",
    "rollup-plugin-serve": "^1.1.0",
    "rollup-plugin-terser": "^7.0.2",
    "rollup-plugin-typescript2": "^0.31.1",
    "typescript": "^4.5.5"
  }
}
rollup.config.js文件

import path from "path"
import livereload from "rollup-plugin-livereload"
import serve from "rollup-plugin-serve"
import { terser } from "rollup-plugin-terser"
import ts from "rollup-plugin-typescript2"

export default {
  input: "./src/index.ts", 

  output: {
    file: path.resolve(__dirname, "./dist/index.js"),
    sourcemap: true,
    format: "umd", 
  },

  plugins: [
    ts(),
    livereload(),
    terser(),
    serve({
      open: true,
      port: 8080,
      openPage: "/public/index.html"
    }),
    
  ]
}

console.log(process.env);