function escape(str) {
    return str.replace(/[\n\r\\\'\u2028\u2029]/g, ch => {
        if (ch === '\n') { return '\\n'; }
        else if (ch === '\r') { return '\\r'; }
        else if (ch === '\\') { return '\\\\'; }
        else if (ch === '\'') { return '\\\''; }
        else if (ch === '\u2028') { return '\\u2028'; }
        else if (ch === '\u2029') { return '\\u2029'; }
        else throw 'Bad char';
    });
}

// example
const escaped = escape(data);
const code = `xxx = '${escaped}';`;