isEmpty.js

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */
'use strict';
/* eslint-disable fb-www/typeof-undefined */

/* eslint-disable no-unused-vars */

var invariant = require("./invariant");
/**
 * Checks if a value is empty.
 */


function isEmpty(value) {
  if (Array.isArray(value)) {
    return value.length === 0;
  } else if (typeof value === 'object') {
    if (value) {
      !(!isIterable(value) || value.size === undefined) ? process.env.NODE_ENV !== "production" ? invariant(false, 'isEmpty() does not support iterable collections.') : invariant(false) : void 0;

      for (var _ in value) {
        return false;
      }
    }

    return true;
  } else {
    return !value;
  }
}

function isIterable(value) {
  if (typeof Symbol === 'undefined') {
    return false;
  }

  return value[Symbol.iterator];
}

module.exports = isEmpty;