Dynamic import compiled to dynamic import + static import which hurts code splition

[hackwaly]

Thank you for filing! Check list:

• Is it a bug? Usage questions should often be asked in the forum instead.
• Concise, focused, friendly issue title & description.
• A minimal, reproducible example.
• OS and browser versions, if relevant.
• Is it already fixed in master? Instructions

[zth]

Please set up a minimal reproduction.

[hackwaly]

Wait. I'm constructing it.

[hackwaly]

updated with a minimal reproduction.

[zth]

Cc @mununki

[mununki]

Here is the self-contained example:

@module("lib")
external make: string = "default"

let _ = Js.import(make)

import Lib from "lib"; // shouldn't be here.

import("lib").then(function (m) {
      return m.default;
    });

I'll look into it.