Going way back to ancient Lisps `let` has been the const declaration in a lot of programming languages. It's too bad ES2015 decided to use `let` for `var`/`val`, because `let` should have been const.
That said, I've come to terms with const, even if I find I accidentally use let sometimes from time spent in Lisp and F#.
let is not a "const declaration" in most major dialects of Lisp, current and historic. In Scheme, Common Lisp, ISLisp, Emacs Lisp and others, it introduces mutable bindings.
Is there really much of a difference between "const" and "con"? I get that one is 66% longer than the other, but does it actually affect the readability of the code or the amount of time it takes to write it?
That said, I've come to terms with const, even if I find I accidentally use let sometimes from time spent in Lisp and F#.