33 lines
1.1 KiB
JavaScript
33 lines
1.1 KiB
JavaScript
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var $ = require('../internals/export');
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var getBuiltIn = require('../internals/get-built-in');
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var fails = require('../internals/fails');
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var $stringify = getBuiltIn('JSON', 'stringify');
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var re = /[\uD800-\uDFFF]/g;
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var low = /^[\uD800-\uDBFF]$/;
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var hi = /^[\uDC00-\uDFFF]$/;
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var fix = function (match, offset, string) {
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var prev = string.charAt(offset - 1);
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var next = string.charAt(offset + 1);
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if ((low.test(match) && !hi.test(next)) || (hi.test(match) && !low.test(prev))) {
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return '\\u' + match.charCodeAt(0).toString(16);
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} return match;
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};
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var FORCED = fails(function () {
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return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"'
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|| $stringify('\uDEAD') !== '"\\udead"';
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});
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if ($stringify) {
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// https://github.com/tc39/proposal-well-formed-stringify
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$({ target: 'JSON', stat: true, forced: FORCED }, {
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// eslint-disable-next-line no-unused-vars
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stringify: function stringify(it, replacer, space) {
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var result = $stringify.apply(null, arguments);
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return typeof result == 'string' ? result.replace(re, fix) : result;
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}
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});
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}
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