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