One way to fix it would be to use the onDestroy :

<script>
    import { count } from './stores.js';
    import Decrementer from './Decrementer.svelte';
    import Resetter from './Resetter.svelte';

Any name beginning with $ is assumed to refer to a store value. It’s effectively a reserved character — Svelte will prevent you from declaring your own variables with a $ prefix.