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Adding dark mode to your Svelte site.

Epicenter

Local-first, open source apps

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Install mode-watcher

Start by installing mode-watcher:

pnpm i mode-watcher

Add the ModeWatcher component

Import the ModeWatcher component and use it in your root layout:

src/routes/+layout.svelte
<script lang="ts">
  import "../app.css";
  import { ModeWatcher } from "mode-watcher";
  let { children } = $props();
</script>
 
<ModeWatcher />
{@render children?.()}

Add a mode toggle

Place a mode toggle on your site to toggle between light and dark mode.

<script lang="ts">
	import MoonIcon from "@lucide/svelte/icons/moon";
	import SunIcon from "@lucide/svelte/icons/sun";
	import { toggleMode } from "mode-watcher";
	import { Button } from "$lib/components/ui/button/index.js";
</script>
 
<Button onclick={toggleMode} variant="outline" size="icon">
	<SunIcon
		class="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 !transition-all dark:scale-0 dark:-rotate-90"
	/>
	<MoonIcon
		class="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 !transition-all dark:scale-100 dark:rotate-0"
	/>
	<span class="sr-only">Toggle theme</span>
</Button>
<script lang="ts">
	import MoonIcon from "@lucide/svelte/icons/moon";
	import SunIcon from "@lucide/svelte/icons/sun";
	import { resetMode, setMode } from "mode-watcher";
	import * as DropdownMenu from "$lib/components/ui/dropdown-menu/index.js";
	import { buttonVariants } from "$lib/components/ui/button/index.js";
</script>
 
<DropdownMenu.Root>
	<DropdownMenu.Trigger class={buttonVariants({ variant: "outline", size: "icon" })}>
		<SunIcon
			class="h-[1.2rem] w-[1.2rem] scale-100 rotate-0 !transition-all dark:scale-0 dark:-rotate-90"
		/>
		<MoonIcon
			class="absolute h-[1.2rem] w-[1.2rem] scale-0 rotate-90 !transition-all dark:scale-100 dark:rotate-0"
		/>
		<span class="sr-only">Toggle theme</span>
	</DropdownMenu.Trigger>
	<DropdownMenu.Content align="end">
		<DropdownMenu.Item onclick={() => setMode("light")}>Light</DropdownMenu.Item>
		<DropdownMenu.Item onclick={() => setMode("dark")}>Dark</DropdownMenu.Item>
		<DropdownMenu.Item onclick={() => resetMode()}>System</DropdownMenu.Item>
	</DropdownMenu.Content>
</DropdownMenu.Root>