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const { promisify } = require('util')
const fs = require('fs')
const optsArg = opts => {
  if (!opts)
    opts = { mode: 0o777, fs }
  else if (typeof opts === 'object')
    opts = { mode: 0o777, fs, ...opts }
  else if (typeof opts === 'number')
    opts = { mode: opts, fs }
  else if (typeof opts === 'string')
    opts = { mode: parseInt(opts, 8), fs }
  else
    throw new TypeError('invalid options argument')

  opts.mkdir = opts.mkdir || opts.fs.mkdir || fs.mkdir
  opts.mkdirAsync = promisify(opts.mkdir)
  opts.stat = opts.stat || opts.fs.stat || fs.stat
  opts.statAsync = promisify(opts.stat)
  opts.statSync = opts.statSync || opts.fs.statSync || fs.statSync
  opts.mkdirSync = opts.mkdirSync || opts.fs.mkdirSync || fs.mkdirSync
  return opts
}
module.exports = optsArg