{
 "presets": [
 "es2015",
 "stage-3"
 ]
}

babel-node src/index.js

 "scripts": {
 ......
 "build": "babel src -d dist --source-maps"
 }

{
 // See https://go.microsoft.com/fwlink/?LinkId=733558
 // for the documentation about the tasks.json format
 "version": "0.1.0",
 "command": "npm", //执行npm命令
 "isShellCommand": true,
 "showOutput": "always",
 "suppressTaskName": true,
 "tasks": [
 {
  "taskName": "build", //task名称
  "args": [ //npm run build
  "run",
  "build"
  ],
  "isBuildCommand": true
 }
 ]
}

{
 // Use IntelliSense to learn about possible Node.js debug attributes.
 // Hover to view descriptions of existing attributes.
 // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
 "version": "0.2.0",
 "configurations": [
 {
  "type": "node",
  "request": "launch",
  "name": "启动程序",
  "program": "${workspaceRoot}\\src\\index.js",
  "sourceMaps": true, //sourcemap打开
  "outFiles": [
  "${workspaceRoot}\\dist\\index.js"
  ], //源映射，指定实际执行文件
  "preLaunchTask": "build" //首先执行build task
 },
 {
  "type": "node",
  "request": "attach",
  "name": "附加到端口",
  "address": "localhost",
  "port": 5858
 }
 ]
}