module.exports = {
  normalizeEntityName: function() {},

  afterInstall: function() {}
};

module.exports = {
  normalizeEntityName: function() {},

  afterInstall: function() {
    return this.addBowerPackageToProject('sweetalert2', '^6.1.0');
  }
};

Add bower package to project
Add bower package to project

Believe this will fix issue #3, plus is desired behaviour anyway because you need the installing Ember project to have sweetalert2 installed via bower.