import { Injectable } from "@angular/core"; import { Observable, of } from "rxjs"; import { map } from "rxjs/operators"; @Injectable() export class AutocompleteService { setFetchMethod(fn?: (...args: unknown[]) => unknown): any { void fn; return; } fetch( val?: string, pageEnd?: boolean, serviceOptions?: unknown ): Observable { void val; void pageEnd; void serviceOptions; return of([]).pipe(map((o) => o)); } }