Why in this example i get Uncaught ReferenceError: CONST1 is not defined

consts.js

const CONST1 = "hello";

sample.js

jQuery.getScript("consts.js', function() {
    alert(CONST1);
});

I guess it has something to do with scope. But since getScript uses global scope i cannot understand why this fails.

P.S. By using var instead of const it seems to work. But i cannot get the exact reason.