Can someone explain why debounceTime() is not callable from service class. I created a service out of fromEvent observable which I subscribe to, the aim was to reduce code repetition but I get this error.

DebounceSearchService

import { Injectable } from '@angular/core';
import { fromEvent } from 'rxjs';
import { debounceTime, distinctUntilChanged, filter, map } from 'rxjs/operators';

export class DebounceSearchService {

    constructor() { }

    search(input: HTMLInputElement, debounceTime: number) {
        return fromEvent(input, 'keyup').pipe(
            debounceTime(2000),

            // get value
            map((event: any) => { return event.target.value;})

            // if character length greater then 2
            , filter(res => res.length > 2)

            // If previous query is diffent from current   
            , distinctUntilChanged()

            // subscribe for response
            , 
    );
}

}

I did lookup other answers, but not sure and there was no clear answer to this.