const fs = require('promise-fs');
const path = require('path');

const output2File = (dir, filename = '', data) =>
 new Promise((resolve, reject) => {
 const handleError = err => {
 reject(err);
 console.error(err);
 };

 const completeDir = path.join(dir, filename);
 console.log(completeDir);
 fs.readFile(completeDir, {
 encoding: 'utf8',
 })
 .then(res => {
 fs.writeFile(completeDir, `${res}\n${data}`)
 .then(() => resolve())
 .catch(handleError);
 })
 .catch(err => {
 const { errno } = err;
 // no directory or filename
 if (errno === -2 || errno === -4058) {
 fs.mkdirSync(dir, { recursive: true });
 fs.writeFile(completeDir, data)
 .then(() => resolve())
 .catch(handleError);
 }
 });
 });

module.exports = output2File;