Lint warning “get is deprecated” when trying to manually inject NgControl

Question

Simple case but could not figure out the answer so far.
From angular v4 when trying to manually inject NgControl :

this.injector.get(NgControl);

The lint starts complaining:

get is deprecated: from v4.0.0 use Type<T> or InjectionToken<T>

How to properly inject it using injector ?

Answer 1

(Using Angular 8) This passes without TSLint errors:

this.injector.get<NgControl>(NgControl as Type<NgControl>);

However there is a more elegant solution via the constructor.

    constructor(@Self() @Optional() public ngControl: NgControl) {
      if(this.ngControl) {
        this.ngControl.valueAccessor = this;
      }
    }

But you need to bear in mind this is an inline (more elegant) replacement for NG_VALUE_ACCESSOR - you will get a cyclical dependency error using both.

   providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => FieldComponent),
      multi: true
    }

Answer 2

You have to use it like this now:

this.injector.get<NgControl>(NgControl);

See the angular documention: https://angular.io/api/core/Injector

get<T>(token: Type<T> | InjectionToken<T>, notFoundValue?: T, flags?: InjectFlags): T