[6a3a178] | 1 | var $ = require('../internals/export');
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| 2 | var getBuiltIn = require('../internals/get-built-in');
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| 3 | var fails = require('../internals/fails');
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| 4 |
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| 5 | var $stringify = getBuiltIn('JSON', 'stringify');
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| 6 | var re = /[\uD800-\uDFFF]/g;
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| 7 | var low = /^[\uD800-\uDBFF]$/;
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| 8 | var hi = /^[\uDC00-\uDFFF]$/;
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| 9 |
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| 10 | var fix = function (match, offset, string) {
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| 11 | var prev = string.charAt(offset - 1);
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| 12 | var next = string.charAt(offset + 1);
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| 13 | if ((low.test(match) && !hi.test(next)) || (hi.test(match) && !low.test(prev))) {
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| 14 | return '\\u' + match.charCodeAt(0).toString(16);
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| 15 | } return match;
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| 16 | };
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| 17 |
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| 18 | var FORCED = fails(function () {
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| 19 | return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"'
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| 20 | || $stringify('\uDEAD') !== '"\\udead"';
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| 21 | });
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| 22 |
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| 23 | if ($stringify) {
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| 24 | // `JSON.stringify` method
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| 25 | // https://tc39.es/ecma262/#sec-json.stringify
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| 26 | // https://github.com/tc39/proposal-well-formed-stringify
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| 27 | $({ target: 'JSON', stat: true, forced: FORCED }, {
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| 28 | // eslint-disable-next-line no-unused-vars -- required for `.length`
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| 29 | stringify: function stringify(it, replacer, space) {
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| 30 | var result = $stringify.apply(null, arguments);
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| 31 | return typeof result == 'string' ? result.replace(re, fix) : result;
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| 32 | }
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| 33 | });
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| 34 | }
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