This script prevents the white flash of death for static rendered sites. It is very important that the script is added just after the opening body tag and before any other content.

You can also pass the name of your default light and dark themes as props. These defaults will be used when visitor come to your site for the first time and will try to match their preference using window.matchMedia("(prefers-color-scheme: dark)"); and the default light theme if this cannot be determined.

import Document, { Html, Head, Main, NextScript } from 'next/document'
import { ThemeScriptTag } from 'use-theme-switcher';

export default class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
        </Head>
        <body>
          <ThemeScriptTag defaultDarkTheme="theme-dark" defaultLightTheme="theme-light" />
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

Add the `ThemeProvider` to `_app.js`

import '../styles/index.css'
import { ThemeProvider } from 'use-theme-switcher';

function MyApp({ Component, pageProps }) {
  return <ThemeProvider>
      <Component {...pageProps} />
    </ThemeProvider>
}

export default MyApp

Add your themes

This plugin adds a custom class name to the body element of your site and uses CSS variables to customise your color scheme. Add your themes with the .theme-* format:

.theme-twitter {
  --color-bg-primary: #15202B;
  --color-bg-primary-light: #172D3F;
  --color-bg-accent: #1B91DA; 
  --color-bg-accent-light: #1B91DA; 
  --color-bg-secondary: #657786;
  --color-text-link: #1B91DA;    
  --color-bg-compliment: #112b48;
  --color-bg-default: #192734;
  --color-bg-inverse: #1B91DA;
  --color-text-primary: #fff;
  --color-text-secondary: #f2f2f2;
  --color-text-default: #e9e9e9;
  --color-text-default-soft: #6a6a6a;
  --color-text-inverse: #1B91DA;
  --color-text-inverse-soft: #1B91DA;
}

Switching Themes

To switch themes, use the ThemeContext hook.

import React, { useContext } from "react"
import { ThemeContext } from 'use-theme-switcher';

const { theme, switchTheme } = useContext(ThemeContext);

Add A Theme Switcher Component

You can implement your own theme switcher component but here is a basic example:

import React from "react";

const myThemes = [
    {
        id: "theme-midnightgreen",
        name: "Midnight Green",
    },
    {
        id: "theme-spacegray",
        name: "Space Gray",
    },
    {
        id: "theme-twitter",
        name: "Twitter Dark",
    }
]

const ThemePicker = ({ theme, setTheme }) => {
    if (theme) {
        return (
            <div>
            {myThemes.map((item, index) => {
                const nextTheme = myThemes.length -1 === index ? myThemes[0].id : myThemes[index+1].id;
                
                return item.id === theme ? (
                    <div key={item.id} className={item.id}>
                    <button
                        aria-label={`Theme ${item.name}`}
                        onClick={() => setTheme(nextTheme)}
                    >
                        {item.name}
                    </button>
                    </div>
                ) : null;
                    }
                )}
            </div>
        );
    }
    return null;
};

export default ThemePicker;

`ThemeScriptTag` Properties

Prop	Description
`defaultDarkTheme`	Initial theme name when `prefers-color-scheme: dark`
`defaultLightTheme`	Initial theme name when preference cannot be determined
`themeStorageKey`	Key to persist the theme name in `localStorage`. Default = `"theme"`.
`minify`	Minify the injected script using Terser. Default = `true`.

Custom `themeStorageKey`

If you want to change the themeStorageKey, ensure the same prop value is passed to both the ThemeScriptTag and the ThemeProvider. Example:

function MyApp({ Component, pageProps }) {
  return <ThemeProvider themeStorageKey='my-custom-key'>
      <Component {...pageProps} />
    </ThemeProvider>
}

export default class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
        </Head>
        <body>
          <ThemeScriptTag 
            defaultDarkTheme="theme-dark" 
            defaultLightTheme="theme-light" 
            themeStorageKey='my-custom-key'
          />
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

Credit

This plugin is based on the work and inspired by Sam Larsen-Disney and Josh Comeau

LICENSE

MIT LICENSE

Keywords

FAQs

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Package last updated on 29 Nov 2020

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Install

use-theme-switcher

Because Dark Mode is not enough!

Demo

Gatsby Plugin 👀

Install

Usage with NextJS

Add the ThemeScriptTag to _document.

Add the ThemeProvider to _app.js

Add your themes

Switching Themes

Add A Theme Switcher Component

ThemeScriptTag Properties

Custom themeStorageKey

Credit

LICENSE

Keywords

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Add the `ThemeScriptTag` to `_document`.

Add the `ThemeProvider` to `_app.js`

`ThemeScriptTag` Properties

Custom `themeStorageKey`