import-local 
Let a globally installed package use a locally installed version of itself if available
Useful for CLI tools that want to defer to the user's locally installed version when available, but still work if it's not installed locally. For example, AVA and XO uses this method.
Install
$ npm install import-local
Usage
const importLocal = require('import-local');
if (importLocal(__filename)) {
console.log('Using local version of this package');
} else {
// Code for both global and local version here…
}
License
MIT © Sindre Sorhus