tsconfig.json

{
  "compilerOptions": {
    //目标转化为es5
    "target": "es5",
    //采用commonjs模块依赖
    "module": "commonjs",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    //输出目录
    "outDir": "build",
    //支持语言
    "lib": [
      "es6"
    ]
  },
  //排除目录
  "exclude": [
    "node_modules"
  ]
}