Declaring Global Constants in JavaScript.

Question

How do we declare constants globally in JS?
For var, we could do:

var a;
const func = () => {
a = 10;
}

We can't do that with const.. it has to be initialized when it is declared. How to make it global scope inside a function?

This gives an error with 'use strict':
const func = () => {
a = 10;
}

Answer 1

Martin Taylor , the function wasn't what I was talking of.. It is just putting the a in it.