Generate file with Sass Placeholders reading of one directory

generate-placeholder-icon.js

'use strict';

const fs = require('fs');

function readDir(path) {
  return new Promise( (resolve, reject) => {
    fs.readdir(path, (err, data) => err ? reject(err) : resolve(data));
  });
};

function createFile(files, path) {
  return new Promise( (resolve, reject) => {
    files.forEach(file => {
      let value = `%${file.replace('.svg', '')} {\n\ \tbackground-image: url('${path}/${file}');\n}\n\n`;
      file = file.replace('.svg', '');
      fs.writeFile(`${path}/_icons.scss`, value, {flag: 'a+'}, err => err ? reject(err) : resolve(`\tCreated!`));
    });
  });
}

readDir('icons')
  .then(files => {
    createFile(files, 'icons')
      .then(success => {
        console.log(' ');
        console.log(success);
        console.log(' ');
      })
      .catch(err => {
        throw new Error(err);
      });
  })
  .catch(err => {
    throw new Error(err);
  });