But it could simply be implemented using the same routine in browsers like `import`. I don't see why `require` can't be asynchronous. There's an implicit join a

But it could simply be implemented using the same routine in browsers like `import`. I don't see why `require` can't be asynchronous. There's an implicit join after the last import. Maybe it would have been enough to restrict calls to `require` to the top of a file.