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Basic Svelte
Introduction
Reactivity
Props
Logic
Events
Bindings
Classes and styles
Actions
Transitions
Advanced Svelte
Advanced reactivity
Reusing content
Motion
Advanced bindings
Advanced transitions
Context API
Special elements
<script module>
Next steps
Basic SvelteKit
Introduction
Routing
Loading data
Headers and cookies
Shared modules
Forms
API routes
Stores
Errors and redirects
Advanced SvelteKit
Hooks
Page options
Link options
Advanced routing
Advanced loading
Environment variables
Conclusion

In all the examples we’ve seen so far, the <script> block contains code that runs when each component instance is initialised. For the vast majority of components, that’s all you’ll ever need.

Very occasionally, you’ll need to run some code outside of an individual component instance. For example: returning to our custom audio player from a previous exercise, you can play all four tracks simultaneously. It would be better if playing one stopped all the others.

We can do that by declaring a <script module> block. Code contained inside it will run once, when the module first evaluates, rather than when a component is instantiated. Place this at the top of AudioPlayer.svelte (note that this is a separate script tag):

AudioPlayer
<script module>
	let current;
</script>

It’s now possible for the components to ‘talk’ to each other without any state management:

AudioPlayer
<audio
	src={src}
	bind:currentTime={time}
	bind:duration
	bind:paused
	onplay={(e) => {
		const audio = e.currentTarget;

		if (audio !== current) {
			current?.pause();
			current = audio;
		}
	}}
	onended={() => {
		time = 0;
	}}
/>

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<script>
	import AudioPlayer from './AudioPlayer.svelte';
	import { tracks } from './tracks.js';
</script>
 
<div class="centered">
	{#each tracks as track}
		<AudioPlayer {...track} />
	{/each}
</div>
 
<style>
	.centered {
		display: flex;
		flex-direction: column;
		height: 100%;
		justify-content: center;
		gap: 0.5em;
		max-width: 40em;
		margin: 0 auto;
	}
</style>