Checks if package is installed and if yes - returns package version.
const checkPackages = require('get-package-version')
const versions = checkPackage('nuxt fs');
console.log(vesions)
// {nuxt: '2.3.4', fs: null}
// 'fs' has no 'package.json'
const versions2 = checkPackage(['vue-loader', 'randomModuleIJustInvented'])
console.log(vesions2)
// {vue-loader: '15.4.2', randomModuleIJustInvented: null}