text: 'use strict';
  
  var isRegExp = require('./_is-regexp');
  var anObject = require('./_an-object');
  var speciesConstructor = require('./_species-constructor');
  var advanceStringIndex = require('./_advance-string-index');
  var toLength = require('./_to-length');
  var callRegExpExec = require('./_regexp-exec-abstract');
  var regexpExec = require('./_regexp-exec');
  var fails = require('./_fails');
  var $min = Math.min;
  var $push = [].push;
  var $SPLIT = 'split';
  var LENGTH = 'length';
  var LAST_INDEX = 'lastIndex';
  var MAX_UINT32 = 0xffffffff;
  
  // babel-minify transpiles RegExp('x', 'y') -> /x/y and it causes SyntaxError
  var SUPPORTS_Y = !fails(function () { RegExp(MAX_UINT32, 'y'); });
  
  // @@split logic
  require('./_fix-re-wks')('split', 2, function (defined, SPLIT, $split, maybeCallNative) {
    var internalSplit;
    if (
      'abbc'[$SPLIT](/(b)*/)[1] == 'c' ||
      'test'[$SPLIT](/(?:)/, -1)[LENGTH] != 4 ||
      'ab'[$SPLIT](/(?:ab)*/)[LENGTH] != 2 ||
      '.'[$SPLIT](/(.?)(.?)/)[LENGTH] != 4 ||
      '.'[$SPLIT](/()()/)[LENGTH] > 1 ||
      ''[$SPLIT](/.?/)[LENGTH]
    ) {
      // based on es5-shim implementation, need to rework it
      internalSplit = function (separator, limit) {
        var string = String(this);
        if (separator === undefined && limit === 0) return [];
        // If `separator` is not a regex, use native split
        if (!isRegExp(separator)) return $split.call(string, separator, limit);
        var output = [];
        var flags = (separator.ignoreCase ? 'i' : '') +
                    (separator.multiline ? 'm' : '') +
                    (separator.unicode ? 'u' : '') +
                    (separator.sticky ? 'y' : '');
        var lastLastIndex = 0;
        var splitLimit = limit === undefined ? MAX_UINT32 : limit >>> 0;
        // Make `global` and avoid `lastIndex` issues by working with a copy
        var separatorCopy = new RegExp(separator.source, flags + 'g');
        var match, lastIndex, lastLength;
        while (match = regexpExec.call(separatorCopy, string)) {
          lastIndex = separatorCopy[LAST_INDEX];
          if (lastIndex > lastLastIndex) {
            output.push(string.slice(lastLastIndex, match.index));
            if (match[LENGTH] > 1 && match.index < string[LENGTH]) $push.apply(output, match.slice(1));
            lastLength = match[0][LENGTH];
            lastLastIndex = lastIndex;
            if (output[LENGTH] >= splitLimit) break;
          }
          if (separatorCopy[LAST_INDEX] === match.index) separatorCopy[LAST_INDEX]++; // Avoid an infinite loop
        }
        if (lastLastIndex === string[LENGTH]) {
          if (lastLength || !separatorCopy.test('')) output.push('');
        } else output.push(string.slice(lastLastIndex));
        return output[LENGTH] > splitLimit ? output.slice(0, splitLimit) : output;
      };
    // Chakra, V8
    } else if ('0'[$SPLIT](undefined, 0)[LENGTH]) {
      internalSplit = function (separator, limit) {
        return separator === undefined && limit === 0 ? [] : $split.call(this, separator, limit);
      };
    } else {
      internalSplit = $split;
    }
  
    return [
      // `String.prototype.split` method
      // https://tc39.github.io/ecma262/#sec-string.prototype.split
      function split(separator, limit) {
        var O = defined(this);
        var splitter = separator == undefined ? undefined : separator[SPLIT];
        return splitter !== undefined
          ? splitter.call(separator, O, limit)
          : internalSplit.call(String(O), separator, limit);
      },
      // `RegExp.prototype[@@split]` method
      // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@split
      //
      // NOTE: This cannot be properly polyfilled in engines that don't support
      // the 'y' flag.
      function (regexp, limit) {
        var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== $split);
        if (res.done) return res.value;
  
        var rx = anObject(regexp);
        var S = String(this);
        var C = speciesConstructor(rx, RegExp);
  
        var unicodeMatching = rx.unicode;
        var flags = (rx.ignoreCase ? 'i' : '') +
                    (rx.multiline ? 'm' : '') +
                    (rx.unicode ? 'u' : '') +
                    (SUPPORTS_Y ? 'y' : 'g');
  
        // ^(? + rx + ) is needed, in combination with some S slicing, to
        // simulate the 'y' flag.
        var splitter = new C(SUPPORTS_Y ? rx : '^(?:' + rx.source + ')', flags);
        var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
        if (lim === 0) return [];
        if (S.length === 0) return callRegExpExec(splitter, S) === null ? [S] : [];
        var p = 0;
        var q = 0;
        var A = [];
        while (q < S.length) {
          splitter.lastIndex = SUPPORTS_Y ? q : 0;
          var z = callRegExpExec(splitter, SUPPORTS_Y ? S : S.slice(q));
          var e;
          if (
            z === null ||
            (e = $min(toLength(splitter.lastIndex + (SUPPORTS_Y ? 0 : q)), S.length)) === p
          ) {
            q = advanceStringIndex(S, q, unicodeMatching);
          } else {
            A.push(S.slice(p, q));
            if (A.length === lim) return A;
            for (var i = 1; i <= z.length - 1; i++) {
              A.push(z[i]);
              if (A.length === lim) return A;
            }
            q = p = e;
          }
        }
        A.push(S.slice(p));
        return A;
      }
    ];
  });
  