1const { promisify } = require('util')
2const fs = require('fs')
3const optsArg = opts => {
4  if (!opts)
5    opts = { mode: 0o777, fs }
6  else if (typeof opts === 'object')
7    opts = { mode: 0o777, fs, ...opts }
8  else if (typeof opts === 'number')
9    opts = { mode: opts, fs }
10  else if (typeof opts === 'string')
11    opts = { mode: parseInt(opts, 8), fs }
12  else
13    throw new TypeError('invalid options argument')
14
15  opts.mkdir = opts.mkdir || opts.fs.mkdir || fs.mkdir
16  opts.mkdirAsync = promisify(opts.mkdir)
17  opts.stat = opts.stat || opts.fs.stat || fs.stat
18  opts.statAsync = promisify(opts.stat)
19  opts.statSync = opts.statSync || opts.fs.statSync || fs.statSync
20  opts.mkdirSync = opts.mkdirSync || opts.fs.mkdirSync || fs.mkdirSync
21  return opts
22}
23module.exports = optsArg
24