I'm alone in this but I prefer `let` over everything else unless it's something like Redux action strings, database connections strings, or anything of the like. I rarely use `const` for the ridiculous reason that I find it too long (5 characters!). `let` is short and reads nicely and my programming style in general never mutates stuff anyway (I use Ramda/always return new data).

That said, `const` is picking up to be the default for everything. I can definitely see good reasons to use it when declaring functions and required modules or working in a team.