Export defualt const is invalid because...

`const` is a [lexical declaration](http://www.ecma-international.org/ecma-262/6.0/#sec-let-and-const-declarations)

`default` [expects a HoistableDeclaration, ClassDeclaration or AssignmentExpression ](http://www.ecma-international.org/ecma-262/6.0/#sec-exports-static-semantics-boundnames)

and thus, `export default const someVariable` is a _SynthaxError_

Eduardo Gutiérrez
February 21, 2021