Depends on what you are writing. If it's something that has to be maintained for more than a month, use Typescript or Flow. Just do it. Everything else is a PI

Depends on what you are writing. If it's something that has to be maintained for more than a month, use Typescript or Flow. Just do it. Everything else is a PITA. If it's just something you want to whip up quickly and won't be maintained, jumping through all the hoops of npm, building and bundling is just annoying.