launch.json:

{
	"version": "0.2.0",
	"configurations": [
		{
			"name": "Mocha tests",
			"type": "node",
			"request": "launch",
			"program": "${workspaceRoot}/node_modules/.bin/_mocha",
			"args": ["-u", "tdd", "--timeout", "999999", "--colors", "src/**/*.test.js", "bin/*.test.js"],
			"internalConsoleOptions": "openOnSessionStart"
		}
	]
}

Auto format with prettier on save:

npm install --save-dev babel-eslint eslint eslint-config-prettier eslint-plugin-prettier prettier

settings.json:

{
	"eslint.autoFixOnSave": true
}