# Shared Timers

> [!WARNING]
> Mostly does not work on mobile https://caniuse.com/sharedworkers

Timers in [SharedWorker](https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker), shared across browser tabs (within same origin). One timer per delay, many callbacks for each timer.

## Motivation

* Keep timer callbacks in sync betweet tabs.
* Escape the [throttling of window timers in inactive tabs](https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout#timeouts_in_inactive_tabs).

## Getting Started

Install using your preferred package manager, for example NPM:

```shell
npm install shared-timers
```

Use it in your project like this:

```typescript
import { runTimer, clearTimer } from 'shared-timers'

const firstCallbackId = runTimer(() => {
    // Something executed periodically from a newly created `setInterval`.
}, 1000)

const secondCallbackId = runTimer(() => {
    // Something executed periodically from the same `setInterval`.
}, 1000)

// Remove callback from timer/execution.
clearTimer(secondCallbackId)
```