gistfile.js

const fs = require('fs');

module.exports.getFiles = function() {
  return new Promise((resolve, reject) => {
    fs.readFile('/home/usr', (err, data) => {
      if (err) {
        reject(err);
      }
      else {
        resolve(data);
      }
    });
  });
}



// then in another file we can call
const whatever = require('./filename');
whatever.getFiles
.then((data) => {
  console.log(data);
})
  .catch((err) => {
    console.log(err);
  });