.vscode_launch.json

{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Launch",
			"type": "node",
			"request": "launch",
			"program": "${workspaceRoot}/index.js",
			"stopOnEntry": false,
			"args": [],
			"cwd": "${workspaceRoot}",
			"preLaunchTask": null,
			"runtimeExecutable": null,
			"runtimeArgs": [
				"--nolazy"
			],
			"env": {
				"NODE_ENV": "development"
			},
			"externalConsole": false,
			"sourceMaps": false,
			"outDir": null
		},
		{
			"name": "Attach",
			"type": "node",
			"request": "attach",
			"port": 5858,
			"address": "localhost",
			"restart": false,
			"sourceMaps": false,
			"outDir": null,
			"localRoot": "${workspaceRoot}",
			"remoteRoot": null
		}
	]
}

index.js

'use strict'

this should have error highlighting

jsonconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs"
  }
}

sub_package.json

{
  "name": "min-fail",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "grunt": "^1.0.1",
    "grunt-browserify": "^5.0.0"
  }
}