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Basic Svelte
Introduction
Reactivity
Props
Logic
Events
Bindings
Classes and styles
Actions
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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
$app/state
Errors and redirects
Advanced SvelteKit
Hooks
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Advanced routing
Advanced loading
Environment variables
Conclusion
Advanced SvelteKit Environment variables $env/static/public

ブラウザに公開しても安全な環境変数もあります。これらは PUBLIC_ プレフィックスを付けることで、プライベートな環境変数と区別します。

.env にある2つのパブリックな環境変数に値を追加します。

PUBLIC_THEME_BACKGROUND="steelblue"
PUBLIC_THEME_FOREGROUND="bisque"

そして、これらを src/routes/+page.svelte にインポートします。

src/routes/+page
<script>
	const PUBLIC_THEME_BACKGROUND = 'white';
	const PUBLIC_THEME_FOREGROUND = 'black';
	import {
		PUBLIC_THEME_BACKGROUND,
		PUBLIC_THEME_FOREGROUND
	} from '$env/static/public';
</script>
<script lang="ts">
	const PUBLIC_THEME_BACKGROUND = 'white';
	const PUBLIC_THEME_FOREGROUND = 'black';
	import {
		PUBLIC_THEME_BACKGROUND,
		PUBLIC_THEME_FOREGROUND
	} from '$env/static/public';
</script>

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<script>
	const PUBLIC_THEME_BACKGROUND = 'white';
	const PUBLIC_THEME_FOREGROUND = 'black';
</script>
 
<main
	style:background={PUBLIC_THEME_BACKGROUND}
	style:color={PUBLIC_THEME_FOREGROUND}
>
	{PUBLIC_THEME_FOREGROUND} on {PUBLIC_THEME_BACKGROUND}
</main>
 
<style>
	main {
		position: fixed;
		display: flex;
		align-items: center;
		justify-content: center;
		left: 0;
		top: 0;
		width: 100%;
		height: 100%;
		font-size: 10vmin;
	}
</style>