1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var call = require('../internals/function-call');
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4 | var uncurryThis = require('../internals/function-uncurry-this');
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5 | var requireObjectCoercible = require('../internals/require-object-coercible');
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6 | var toString = require('../internals/to-string');
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7 | var fails = require('../internals/fails');
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8 |
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9 | var $Array = Array;
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10 | var charAt = uncurryThis(''.charAt);
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11 | var charCodeAt = uncurryThis(''.charCodeAt);
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12 | var join = uncurryThis([].join);
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13 |
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14 | var $toWellFormed = ''.toWellFormed;
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15 | var REPLACEMENT_CHARACTER = '\uFFFD';
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16 |
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17 |
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18 | var TO_STRING_CONVERSION_BUG = $toWellFormed && fails(function () {
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19 | return call($toWellFormed, 1) !== '1';
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20 | });
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21 |
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22 |
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23 |
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24 | $({ target: 'String', proto: true, forced: TO_STRING_CONVERSION_BUG }, {
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25 | toWellFormed: function toWellFormed() {
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26 | var S = toString(requireObjectCoercible(this));
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27 | if (TO_STRING_CONVERSION_BUG) return call($toWellFormed, S);
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28 | var length = S.length;
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29 | var result = $Array(length);
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30 | for (var i = 0; i < length; i++) {
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31 | var charCode = charCodeAt(S, i);
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32 |
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33 | if ((charCode & 0xF800) !== 0xD800) result[i] = charAt(S, i);
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34 |
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35 | else if (charCode >= 0xDC00 || i + 1 >= length || (charCodeAt(S, i + 1) & 0xFC00) !== 0xDC00) result[i] = REPLACEMENT_CHARACTER;
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36 |
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37 | else {
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38 | result[i] = charAt(S, i);
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39 | result[++i] = charAt(S, i);
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40 | }
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41 | } return join(result, '');
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42 | }
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43 | });
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