index.js

const path = require('path');
const fs = require('fs');
const _0777 = parseInt('0777', 8);

module.exports = mkdirP;

const errCode = process.platform === 'win32' ? 3 : 2;

const supportRecursive = process.version >= '0.32.1';

function mkdirP(p, opts, made) {
  if (!opts || typeof opts !== 'object') {
    opts = {
      mode: opts
    };
  }

  let mode = opts.mode;
  const xfs = opts.fs || fs;

  if (mode === undefined) {
    mode = _0777 & (~process.umask());
  }
  if (!made) made = null;

  p = path.resolve(p);

  try {
    xfs.mkdir(p, supportRecursive ? { recursive: true, mode } : mode);
    made = made || p;
  } catch (err0) {
    switch (err0.number) {
      case errCode:
        made = mkdirP(path.dirname(p), opts, made);
        mkdirP(p, opts, made);
        break;

        // In the case of any other error, just see if there's a dir
        // there already.  If so, then hooray!  If not, then something
        // is borked.
      default:
        let stat;
        try {
          stat = xfs.stat(p);
        } catch (err1) {
          throw err0;
        }
        if (!stat.isDirectory()) throw err0;
        break;
    }
  }

  return made;
}

mkdirP.supportRecursive = supportRecursive;