[Bug]: commonjs lazy transform produces invalid output with multiple ns imports for same module

[nicolo-ribaudo]

💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

import * as a from "mod";
import * as b from "mod";

later(() => [a, b])

Configuration file name

No response

Configuration

const out = transformSync(input, {
  configFile: false,
  plugins: [[await load(`transform-modules-commonjs`), { lazy: true }]],
});

Current and expected behavior

Current:

"use strict";

function a() {
  const data = _interopRequireWildcard(require("mod"));
  a = function () {
    return data;
  };
  return data;
}
var b = a();
function _getRequireWildcardCache(nodeInterop) { ... }
later(() => [a(), b()]);

Expected (note the b declaration):

"use strict";

function a() {
  const data = _interopRequireWildcard(require("mod"));
  a = function () {
    return data;
  };
  return data;
}
var b = a;
function _getRequireWildcardCache(nodeInterop) { ... }
later(() => [a(), b()]);

Environment

Current main

Possible solution

No response

Additional context

No response

[nicolo-ribaudo]

Still happens with #15878, also with import defer.

This bug blocks #15878 and #15898.