Converting from Jasmine to Jest issue with define not defined for DefaultLoader

Using Aurelia 1.x and am trying to convert jasmine/karma to jest. For the most part I figured out the babel-jest setup and it seems like everything is working until I hit a little bit of advanced code where we dynamically load a couple classes using the DefaultLoader (aurelia-loader-default).

It doesn’t like the “var nonAnonDefine = define” in the addPlugin.

Wondering if anyone has encountered similar scenario.


    "targets": "> 0.25%, not dead",
    "presets": [
        ["@babel/preset-env", {
            "loose": true,
            "exclude": ["@babel/plugin-proposal-dynamic-import"]
    "plugins": [
        ["@babel/plugin-proposal-decorators", {"legacy": true}],
        ["@babel/plugin-proposal-class-properties", {"loose": true}],
        ["@babel/plugin-proposal-private-methods", {"loose": true}],
        ["@babel/plugin-proposal-private-property-in-object", {"loose": true}],
  DefaultLoader.prototype.addPlugin = function (pluginName, implementation) {
    var nonAnonDefine = define;
    nonAnonDefine(pluginName, [], {
      'load': function load(name, req, onload) {
        var result = implementation.fetch(name);