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rOACCT/node_modules/core-js/modules/esnext.string.to-well-formed.js
dd570dbc4621master

esnext.string.to-well-formed.js
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			'use strict';
			var $ = require('../internals/export');
			var uncurryThis = require('../internals/function-uncurry-this');
			var requireObjectCoercible = require('../internals/require-object-coercible');
			var toString = require('../internals/to-string');

			var $Array = Array;
			var charAt = uncurryThis(''.charAt);
			var charCodeAt = uncurryThis(''.charCodeAt);
			var join = uncurryThis([].join);
			var REPLACEMENT_CHARACTER = '\uFFFD';

			// `String.prototype.toWellFormed` method
			// https://github.com/tc39/proposal-is-usv-string
			$({ target: 'String', proto: true }, {
			toWellFormed: function toWellFormed() {
			var S = toString(requireObjectCoercible(this));
			var length = S.length;
			var result = $Array(length);
			for (var i = 0; i < length; i++) {
			var charCode = charCodeAt(S, i);
			// single UTF-16 code unit
			if ((charCode & 0xF800) != 0xD800) result[i] = charAt(S, i);
			// unpaired surrogate
			else if (charCode >= 0xDC00 \|\| i + 1 >= length \|\| (charCodeAt(S, i + 1) & 0xFC00) != 0xDC00) result[i] = REPLACEMENT_CHARACTER;
			// surrogate pair
			else {
			result[i] = charAt(S, i);
			result[++i] = charAt(S, i);
			}
			} return join(result, '');
			}
			});