Some (ugly!) hacks to fix es6/es7 formatting problems in jsbeautifier. I use it with the "html/css/js prettify" plugin for Sublime Text

jsbeautifier-es6-hacks

// in Sublime Text, Preferences -> Browse Packages, find HTML-CSS-JS Prettify/scripts/node_modules/js-beautify/js/lib/beautify.js
// find the last line of the 'beautify' function, and place the next lines just before 'return sweet_code';
// https://gist.github.com/loopmode/d091bce3b76efaf15d63

// es7 decorators
sweet_code = sweet_code.replace(/@\n/g, '@'); 
sweet_code = sweet_code.replace(/\)@\s/g, ')\n@'); 
sweet_code = sweet_code.replace(/    @    /g, '    @'); 
sweet_code = sweet_code.replace(/@\s/g, '\n@'); 
// destructuring/spread: imports
sweet_code = sweet_code.replace(/(import {\n)(\t|\s*)/g, '\import {'); 
sweet_code = sweet_code.replace(/\n}\nfrom\s/g, '} from '); 
// destructuring/spread: declarations
sweet_code = sweet_code.replace(/(const|let|var)(\s?)*(\{)(\s|\n|\t)*(.*)(\s|\n|\t)*(\})(\s?)*(.*)/g, '$1 {$5} $9');