typeof XService is not assignable to type 'FactoryProvider'. Property 'provide' is missing

Vote count: 0

I have an Angular 2 NgModule in a Ionic 2 mobile app defined like so:

@NgModule({
  declarations: [
    MyApp,
    HomePage,
  ],
  imports: [
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
  ],
  providers: [{provide: ErrorHandler, useClass: IonicErrorHandler}, VatRatesDbService]
})
export class AppModule {}

and the service defined this way:

import { Injectable } from '@angular/core';
import * as PouchDB from 'pouchdb';

@Injectable()
export class VatRatesDbService {

  private _db;

  private constructor() {
    this._db = new PouchDB('rates.db', { adapter: 'websql' });
  }
}

however, I'm getting the following error on runtime - Type 'typeof VatRatesDbService' is not assignable to type 'FactoryProvider'. Property 'provide' is missing in type 'typeof VatRatesDbService'.

asked 1 min ago

kosiara - Bartosz Kosarzycki

1 Answer

Vote count: 0

The solution is to remove the private modifier from the constructor. You simply cannot have an injectable service with a private constuctor.

public constructor() {
  this._db = new PouchDB('rates.db', { adapter: 'websql' });
}

or:

constructor() {
  this._db = new PouchDB('rates.db', { adapter: 'websql' });
}

answered 1 min ago

kosiara - Bartosz Kosarzycki

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typeof XService is not assignable to type 'FactoryProvider'. Property 'provide' is missing