pob-babel/lib/utils/copyFile.js

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'use strict';

const fs = require('fs');
const path = require('path');
const mkdirp = require('mkdirp');

module.exports = function copyFile(source, target) {
  return new Promise((resolve, reject) => {
    mkdirp(path.dirname(target), () => {
      let rd = fs.createReadStream(source);
      rd.on('error', err => reject(new Error(`failed to read file "${source}": ${err.message}`)));
      let wr = fs.createWriteStream(target);
      wr.on('error', err => reject(new Error(`failed to write file "${target}": ${err.message}`)));
      wr.on('finish', resolve);
      wr.on('end', resolve);
      wr.on('close', resolve);
      rd.pipe(wr);
    });
  });
};