debug.js

// launch.json
{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach",
            "type": "node",
            "request": "attach",
            "port": 9229,
            "protocol": "inspector",
            "restart": true
          }
    ]
}

// package.json
"debug": "node_modules/.bin/nodemon node_modules/babel-cli/bin/babel-node.js --inspect --presets es2015 -- bin/www --inspect"

// .babelrc
{
  "presets": [
    ["env", {
      "targets": {
        "node": "current"
      }
    }]
  ],
  "sourceMaps": true,
  "retainLines": true
}