| 123456789101112131415161718192021 | var toString = require('../lang/toString');    /**     * Escape string into unicode sequences     */    function escapeUnicode(str, shouldEscapePrintable){        str = toString(str);        return str.replace(/[\s\S]/g, function(ch){            // skip printable ASCII chars if we should not escape them            if (!shouldEscapePrintable && (/[\x20-\x7E]/).test(ch)) {                return ch;            }            // we use "000" and slice(-4) for brevity, need to pad zeros,            // unicode escape always have 4 chars after "\u"            return '\\u'+ ('000'+ ch.charCodeAt(0).toString(16)).slice(-4);        });    }    module.exports = escapeUnicode;
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