Error: Property timer doesn't exist on type typeof Observable

Question

The code is below

import {Component} from \'angular2/core\';
import {Observable} from \'rxjs/Rx\';

@Component({
selector: \'my-app\',
template: \'Ticks (every s         


        

Answer 1

The timer function now need to be imported directly from rxjs library, Below works fine.The message 'fired' will be seen in console after 10 seconds.

import { timer } from 'rxjs';

const numbers = timer(10000);
numbers.subscribe(any => console.log('fired'));

Please see this link for more details:https://rxjs-dev.firebaseapp.com/api/index/function/timer

Answer 2

all you need to do is to import Observable from the root folder of library because older versions of rxjs does not provide complete Observable class in rxjs/Observable

import {Observable} from 'rxjs';

Answer 3

If all you need is a timer, you could use this too:

setInterval(() => {
      this.callNecessaryMethod();
    }, this.intervalInMilliSeconds);

This is the function prototype:

function setInterval(callback: (...args: any[]) => void, ms: number, ...args: any[]): NodeJS.Timer (+2 overloads)

Answer 4

Thats because you havent patched the timer method into the Observable prototype.

Update: Rxjs 6.0.0

Import the creation method as a static pure function:

import { timer } from 'rxjs';
let timer$ = timer(2000,1000);

Original answer:

You have 2 options:

1) Patch the method with:

import 'rxjs/add/observable/timer';

2) Import the operator as a static pure function:

import { timer } from 'rxjs/observable/timer';
let timer$ = timer(2000,1000);

Personally I would recommend the 2nd approach.