How to inject a service into a ES6 helper class - angularjs

Question

Consider the following component
import DoSomethingSpecial from '....';
export default MyComponentController {
constructor() {
this.result = new DoSomethingSpecial().getData();
}
...
}
So, the MyComponentController is of course a controller for a component and the DoSomethingSpecial class is an ES215 class.
The problem I have is as follows: Inside DoSomethingSpecial I would like to use some angular services, like $http and/or $q, etc. How can I inject these into this class, for example:
export default class DoSomethingSpecial {
constructor() {
}
getData() {
let $q = angular.injector().get('$q');
....
}
}
This however doesn't work. Is there an other way, or should I change this class to a service ?
UPDATE: A possible use case: Suppose you download in a service a list of objects, which you convert into instances of MyRecordItems as follows
import MyRecordItem from '...';
export default class MyRecordsService {
constructor($http) {
$http.get('url', { options}).then((response) => {
this.records = [];
response.data.forEach((item) => {
this.records.push(new MyRecordItem(item));
});
});
}
}
Next, somewhere in you app this list is used -> modified -> and saved
let list = myRecordService.getList();
list[0].count = 10;
list[0].save();
How does this record persist itself ? It could be as follows
export default class MyRecordItem {
constructor(data) { this.data = data; }
save() {
let url = ....;
return angular.$injector.get('$http').post(url, this.data)
}
}

Answer 1

Inject the dependencies that your ES6 class needs to the controller's constructor ($q in this case). After you've injected $q to the controller, create an instance of the class, and pass $q as a parameter to the constructor. Assign the instance to this.
import DoSomethingSpecial from '....';
class MyComponentController {
constructor($q) {
'ngInject';
this.doSomethingSpecialInstance = new DoSomethingSpecial($q); // instantiate the service, and pass the dependencies
}
getData() {
this.result = doSomethingSpecialInstance().getData(); // use the instance
}
}
export default MyComponentController;
And the class definition:
export default class DoSomethingSpecial {
constructor($q) {
this.$q = $q;
}
getData() {
// do something with this.$q
}
}