astro-fouc-killer

v0.5.0

Published

4 months ago

Eliminate Dark Mode FOUC (Flash Of Unstyled Content) in Astro. Works with class based dark modes set in local storage and supports system preference.

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avgvstvs96

astro-integration astro-component withastro astro

[!WARNING] This package is a work in progress. Fully functional but not fully tested, please report any bugs you find, and feel free to contribute.

`astro-fouc-killer`

This is an Astro integration that eliminates FOUC (Flash Of Unstyled Content) by injecting an inline script that sets the 'dark' class on the document element before the page is rendered. The script gets the local storage value or, if one isn't provided, uses system preference to determine the theme.

This integration has two parts, the FOUC (Flash Of Unstyled Content) killer script and a local storage listener:

The FOUC killer script is injected inline into the <head> of every page and ensures that the correct dark/light mode CSS is applied before the page is rendered. This eliminates the FOUC that occurs when the page first loads.
The second part is the local storage listener, this script listens for changes to the local storage value and updates the class on the root element of the page accordingly. This is optional, but can serve as a part of your dark mode implementation. See configuration options below.

Usage

Prerequisites

[!IMPORTANT] Only works with class based dark mode.

Installation

Install the integration automatically using the Astro CLI:

pnpm astro add astro-fouc-killer

npx astro add astro-fouc-killer

yarn astro add astro-fouc-killer

bun astro add astro-fouc-killer

Or install it manually:

Install the required dependencies

pnpm add astro-fouc-killer

npm install astro-fouc-killer

yarn add astro-fouc-killer

bun add astro-fouc-killer

Add the integration to your astro config

import { defineConfig } from 'astro/config';
+import astroFoucKiller from "astro-fouc-killer";

export default defineConfig({
  integrations: [
+    astroFoucKiller(),
  ],
});

Configuration

Local Storage Key

The default value for the local storage key is themeToggle, pass a different key to the integration options to change this.

  integrations: [
    astroFoucKiller({
+     localStorageKey: 'dark-mode',
    }),
  ],

Include Storage Listener

By default, the storage listener is not included. If you want to include it, set the includeStorageListener option to true.

  integrations: [
    astroFoucKiller({
+     includeStorageListener: true,
    }),
  ],

Contributing and Testing

This package is structured as a monorepo:

playground contains code for testing the package
package contains the actual package

[!TIP] The following commands are run from the root of the repository. You can also cd to each directory to run pnpm dev directly, if you want.

Install dependencies using pnpm:

pnpm i --frozen-lockfile

Start the package watcher:

pnpm package:dev

Start the playground:

pnpm playground:dev

You can now edit files in package. Please note that making changes to those files may require restarting the playground dev server.

Licensing

AGPL-3.0 Licensed. Made with ❤️ by Bassim [AVGVSTVS96].

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