Dark Theme in Tailwind Svelte

README.md

Dark Theme in Tailwind Svelte

must have tailwind

// tailwind.config.mjs
export default {
	...
	darkMode: 'selector',
	...
}

DarkTheme.svelte

<script>
    import { onMount } from "svelte";
    import { writable } from "svelte/store";

    const theme = writable("light");

    onMount(() => {
        const storedTheme = localStorage.getItem("theme");
        if (storedTheme) theme.set(storedTheme);

        theme.subscribe((value) => {
            document.documentElement.classList.toggle("dark", value === "dark");
            localStorage.setItem("theme", value);
        });
    });

    const toggleTheme = (e) => {
        theme.update((value) => (value === "light" ? "dark" : "light"));
    };
</script>

<button
    id="themeToggle"
    on:click={(e) => {
        toggleTheme(e);
    }}
>
    <svg width="30px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
        <path
            class="sun"
            fill-rule="evenodd"
            d="M12 17.5a5.5 5.5 0 1 0 0-11 5.5 5.5 0 0 0 0 11zm0 1.5a7 7 0 1 0 0-14 7 7 0 0 0 0 14zm12-7a.8.8 0 0 1-.8.8h-2.4a.8.8 0 0 1 0-1.6h2.4a.8.8 0 0 1 .8.8zM4 12a.8.8 0 0 1-.8.8H.8a.8.8 0 0 1 0-1.6h2.5a.8.8 0 0 1 .8.8zm16.5-8.5a.8.8 0 0 1 0 1l-1.8 1.8a.8.8 0 0 1-1-1l1.7-1.8a.8.8 0 0 1 1 0zM6.3 17.7a.8.8 0 0 1 0 1l-1.7 1.8a.8.8 0 1 1-1-1l1.7-1.8a.8.8 0 0 1 1 0zM12 0a.8.8 0 0 1 .8.8v2.5a.8.8 0 0 1-1.6 0V.8A.8.8 0 0 1 12 0zm0 20a.8.8 0 0 1 .8.8v2.4a.8.8 0 0 1-1.6 0v-2.4a.8.8 0 0 1 .8-.8zM3.5 3.5a.8.8 0 0 1 1 0l1.8 1.8a.8.8 0 1 1-1 1L3.5 4.6a.8.8 0 0 1 0-1zm14.2 14.2a.8.8 0 0 1 1 0l1.8 1.7a.8.8 0 0 1-1 1l-1.8-1.7a.8.8 0 0 1 0-1z"
        ></path>
        <path
            class="moon"
            fill-rule="evenodd"
            d="M16.5 6A10.5 10.5 0 0 1 4.7 16.4 8.5 8.5 0 1 0 16.4 4.7l.1 1.3zm-1.7-2a9 9 0 0 1 .2 2 9 9 0 0 1-11 8.8 9.4 9.4 0 0 1-.8-.3c-.4 0-.8.3-.7.7a10 10 0 0 0 .3.8 10 10 0 0 0 9.2 6 10 10 0 0 0 4-19.2 9.7 9.7 0 0 0-.9-.3c-.3-.1-.7.3-.6.7a9 9 0 0 1 .3.8z"
        ></path>
    </svg>
</button>

<style>
    .sun {
        fill: black;
    }
    .moon {
        fill: transparent;
    }

    :global(.dark) .sun {
        fill: transparent;
    }
    :global(.dark) .moon {
        fill: white;
    }
</style>