index.js

/*!
 * is-invalid-path <https://github.com/jonschlinkert/is-invalid-path>
 *
 * Copyright (c) 2015-2018, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

const path = require('path');
const isWindows = (opts = {}) => process.platform !== 'win32' || opts.windows === true;

module.exports = function(fp, options = {}) {
  if (fp === '' || typeof fp !== 'string') return true;
  if (!isWindows(options)) return true;

  // https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath
  const MAX_PATH = options.extended ? 32767 : 260;
  if (typeof fp !== 'string' || fp.length > (MAX_PATH - 12)) {
    return true;
  }

  const rootPath = path.parse(fp).root;
  if (rootPath) fp = fp.slice(rootPath.length);

  // https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#Naming_Conventions
  if (options.file) {
    return /[<>:"/\\|?*]/.test(fp);
  }
  return /[<>:"|?*]/.test(fp);
};