Function beauty

apps/code-beautify/content-script.js:232–247

    let format = (fileType, source, callback) => {

        let beauty = txtResult => {
            let code = document.getElementsByTagName('pre')[0];
            formattedCodes = txtResult;
            document.querySelector('html').classList.add('jf-cb');

            let highlightedHtml;
            try {
                highlightedHtml = fileType === 'javascript' ? highlightJS(txtResult) : highlightCSS(txtResult);
            } catch (e) {
                highlightedHtml = esc(txtResult);
            }

            let lines = highlightedHtml.split('\n');
            code.innerHTML = '<ol>' + lines.map(l => '<li><span>' + l + '</span></li>').join('') + '</ol>';
            callback && callback('ok');
        };

        try {
            if (fileType === 'javascript') {