Transformed imports are not hoisted

[Conduitry]

Upon transforming imports, they are not hoisted to the top of the file, which leads to different meaning/behavior in the original file and the transformed file.

For example,

console.log(foo);
import { foo } from 'bar';

(which is perfectly valid) is transformed to

__shimport__.define('demo.js', ['bar'], function(__import, __exports, __dep_0){ console.log(foo);
var foo = __dep_0.foo; /*import { foo } from 'bar'*/;
});

(which has different behavior from the original code, as foo will still be undefined during the console.log(foo)).

This was, as far as I can tell, the real underlying bug behind sveltejs/sapper#1593 and fixing this would likely be more desirable than the change in sveltejs/sapper#1595 was.