preserveModules caused some unnecessary import and export

I don't know how to explain it, just read the code.

Expect es/Foo/index.js

import Foo from "./Foo.js";

Foo.add = (a, b) => a + b;

const Foo2 = () => {
  return Foo.multiply(10, 10) + 10;
};

export { Foo, Foo2 };

Actual es/Foo/index.js

import Foo from "./Foo.js";
export { default as Foo } from "./Foo.js"; // unnecessary export

Foo.add = (a, b) => a + b;

const Foo2 = () => {
  return Foo.multiply(10, 10) + 10;
};

export { Foo2 };

Or es/Bar/index.js

import Bar from "./Bar.js"; // unnecessary import
export { default } from "./Bar.js";