Transforms util.promisify for node versions < 8
npm install babel-plugin-transform-util-promisify

util.promisify to a function definition``shell`
npm install babel-plugin-transform-util-promisify --save-dev
Add at the top of plugins in .babelrc:
`json`
{
"plugins": [
"transform-util-promisify"
],
"presets": [
["env", {
"targets": {
"node": "current"
}
}]
]
}
The plugin currently transforms code only in these forms:
`js`
import { promisify } from 'util';
and
`js``
const { promisify } = require('promisify');