Can global constants be declared in JavaScript?

Question

If so, what is the syntax for such a declaration?

Answer 1

For the record.

// ES6+ code:
const CONSTGLOBAL1=200;  // it is a constant global

function somef() { 
   document.write(CONSTGLOBAL1); // CONSTGLOBAL1 is defined (because it's global)
   const CONSTLOCAL=200; // it's a local constant
   document.write(CONSTLOCAL); // CONSTLOCAL is defined
}       
somef();
document.write(CONSTLOCAL); // CONSTLOCALis NOT defined.

So, if the constant is defined inside {} then it's local, otherwise, it's global.