AngularJS is encountering issues with dependency injections when using WebStorm and TypeScript

A TypeScript AngularJS component:

class MyComponentCtrl {
    static $inject = ['MyService'];
    constructor(private MyService) {
      MyService.testfn(55); // No error in typescript
    }
}

class MyComponent implements ng.IComponentOptions {
    constructor() {
        this.controller = MyComponentCtrl;
        this.template = 'hello';
    }
}

angular
    .module('app')
    .component('MyComponent', new MyComponent());

An AngularJS service implemented in TypeScript:

class MyService {
    constructor() {

    }

    public testfn(age: number) {
        console.log(age);
    }
}

angular
    .module('app')
    .service('MyService', MyService);

When I press Cmd + Click on the testfn in WebStorm, it's not found ("No decleration to go to"). Also, the TypeScript compiler does not report an error when using testfn with an invalid argument.

However, clicking on MyService in static $inject within WebStorm locates it correctly.

Is there a way to restructure this for better recognition by WebStorm and TypeScript?

Answer №1

Injected MyService is of type any, preventing type errors.

Neither the IDE nor TypeScript can recognize it as an instance of the MyService service. Injecting it as MyService can be misleading, as it is an instance of a class, not the class itself.

To correctly utilize the class:

export class MyService {...}

Import and specify the injected service type like this:

class MyComponentCtrl {
    static $inject = ['MyService'];
    constructor(private myService: MyService) {
      myService.testfn(55);
    }
}

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