v1.0.9

You can (optionally) declare Collection Service configuration details in your module or component providers:

providers: [
  {
    provide: 'COLLECTION_SERVICE_OPTIONS',
    useValue: {
      allowFetchedDuplicates: environment.production,
    }
  },
]

Token COLLECTION_SERVICE_OPTIONS is just a string to don't break lazy-loading (if you are using it).

Options structure:

interface CollectionServiceOptions {
  comparatorFields?: string[];
  throwOnDuplicates?: string;
  allowFetchedDuplicates?: boolean; // if not set: true
}