util-promisifyAll

bluebird's promisifyAll implemented with node 8.x's builtin util.promisify. For those
times when you don't want to pull in all of bluebird just to promisify some functions.

$3

``bash
npm i util-promisifyall
`

$3

It does so by creating and exposing a "promisified" version of each function,
which can then be invoked by appending Async to the old function name, such as:

`
const promisifyAll = require('util-promisifyall'); // note lowercase 'a' in 'all'
const fs = promisifyAll(require('fs'));

const readDir = async (dir) => {
try {
const res = await fs.readdirAsync(dir);
console.log(res);
return res;
} catch (error) {
throw error;
}
}
``