webpack issue #6264 output

main.js

! function (e, n) {
  for (var r in n) e[r] = n[r]
}(exports, function (e) {
  var n = {};

  function r(t) {
    if (n[t]) return n[t].exports;
    var o = n[t] = {
      i: t,
      l: !1,
      exports: {}
    };
    return e[t].call(o.exports, o, o.exports, r), o.l = !0, o.exports
  }
  return r.m = e, r.c = n, r.d = function (e, n, t) {
    r.o(e, n) || Object.defineProperty(e, n, {
      configurable: !1,
      enumerable: !0,
      get: t
    })
  }, r.r = function (e) {
    Object.defineProperty(e, "__esModule", {
      value: !0
    })
  }, r.n = function (e) {
    var n = e && e.__esModule ? function () {
      return e.default
    } : function () {
      return e
    };
    return r.d(n, "a", n), n
  }, r.o = function (e, n) {
    return Object.prototype.hasOwnProperty.call(e, n)
  }, r.p = "", r.w = {}, r(r.s = 0)
}([function (e, n, r) {
  "use strict";
  r.r(n), console.log("using", () => console.log("external1 function1"))
}]));