You're totally safe unless you start line with parentheses, bracket or operator so it's not that hard - https://standardjs.com/rules.html#semicolons https://sta

You're totally safe unless you start line with parentheses, bracket or operator so it's not that hard - https://standardjs.com/rules.html#semicolons https://standardjs.com/rules.html#semicolons const/let is the way of doing javascript, setting global will raise an error (click "run with js" http://jsbin.com/hogegikipo/edit?html,console,output http://jsbin.com/hogegikipo/edit?html,console,output). This is true for ES5 strict mode, ES2015 modules and anything you will transpile from ES2015 modules.