Is it possible to inject dependencies such as a service into Angular 2 pipes?
import {Pipe, PipeTransform} from 'angular2/core';
import {MyService} from './service';
//How can I inject MyService into the pipe?
@Pipe({name: 'exponentialStrength'})
export class ExponentialStrengthPipe implements PipeTransform {
transform(value:number, args:string[]) : any {
return Math.pow(value, parseInt(args[0] || '1', 10));
}
}
To include the dependency in the constructor, follow this example:
export class CustomPipe implements PipeTransform {
constructor(public customService: CustomService) {
}
transform(value:number, args:string[]) : any {
// You can now make use of this.customService
return Math.pow(value, parseInt(args[0] || '1', 10));
}
}
Remember to ensure that you declare the dependency in the app module:
@NgModule({
declarations: [...],
imports: [...],
providers: [..., CustomService],
bootstrap: [AppComponent],
}
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