Runtime crash because wrong order of definitions is not detected

[nponeccop]

TypeScript Version: 2.1.5
Code

export const bar = new Foo()

export class Foo {
}

Expected behavior:

Either a compilation error is thrown or working code is generated

Actual behavior:

The following code is generated:

"use strict";
exports.bar = new Foo();
var Foo = (function () {
    function Foo() {
    }
    return Foo;
}());

It fails at runtime both in Edge and Node because var Foo is not yet defined.

[yuit]

We should issue an error for this case. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes#Hoisting

[nponeccop]

Another reference (it's the latest draft, but probably there is similar place in the latest approved text of ECMAScript standard):

https://tc39.github.io/ecma262/#prod-Declaration

See Declaration vs HoistableDeclaration non-terminals.