├── .gitignore ├── .prettierignore ├── .prettierrc ├── LICENSE ├── README.md ├── gatsby-browser.js ├── gatsby-config.js ├── gatsby-node.js ├── gatsby-ssr.js ├── package.json ├── src ├── components │ ├── App.js │ ├── BrightTitle.js │ ├── DarkToggle.js │ ├── GlobalStyles.js │ ├── Header.js │ ├── Layout.js │ └── ThemeContext.js ├── constants.js └── pages │ ├── 404.js │ ├── index.js │ └── page-2.js └── yarn.lock /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | 8 | # Runtime data 9 | pids 10 | *.pid 11 | *.seed 12 | *.pid.lock 13 | 14 | # Directory for instrumented libs generated by jscoverage/JSCover 15 | lib-cov 16 | 17 | # Coverage directory used by tools like istanbul 18 | coverage 19 | 20 | # nyc test coverage 21 | .nyc_output 22 | 23 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files) 24 | .grunt 25 | 26 | # Bower dependency directory (https://bower.io/) 27 | bower_components 28 | 29 | # node-waf configuration 30 | .lock-wscript 31 | 32 | # Compiled binary addons (http://nodejs.org/api/addons.html) 33 | build/Release 34 | 35 | # Dependency directories 36 | node_modules/ 37 | jspm_packages/ 38 | 39 | # Typescript v1 declaration files 40 | typings/ 41 | 42 | # Optional npm cache directory 43 | .npm 44 | 45 | # Optional eslint cache 46 | .eslintcache 47 | 48 | # Optional REPL history 49 | .node_repl_history 50 | 51 | # Output of 'npm pack' 52 | *.tgz 53 | 54 | # dotenv environment variable files 55 | .env* 56 | 57 | # gatsby files 58 | .cache/ 59 | public 60 | 61 | # Mac files 62 | .DS_Store 63 | 64 | # Yarn 65 | yarn-error.log 66 | .pnp/ 67 | .pnp.js 68 | # Yarn Integrity file 69 | .yarn-integrity 70 | -------------------------------------------------------------------------------- /.prettierignore: -------------------------------------------------------------------------------- 1 | .cache 2 | package.json 3 | package-lock.json 4 | public 5 | -------------------------------------------------------------------------------- /.prettierrc: -------------------------------------------------------------------------------- 1 | { 2 | "semi": true, 3 | "singleQuote": true, 4 | "tabWidth": 2, 5 | "trailingComma": "es5" 6 | } 7 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 gatsbyjs 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | 23 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Gatsby Dark Mode (minimal example) 2 | 3 | This codebase creates an "MVP" version of rehydration-safe, flicker-free Dark Mode. It's described in more detail on my blog: 4 | 5 | https://joshwcomeau.com/gatsby/dark-mode/ 6 | 7 | You can also play with it live (though, fair warning, it's not a terribly exciting application): https://trusting-bose-add650.netlify.app 8 | 9 | --- 10 | 11 | Notable files: 12 | 13 | • gatsby-ssr.js 14 | • src/components/ThemeContext.js 15 | • src/constants.js 16 | -------------------------------------------------------------------------------- /gatsby-browser.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | 3 | import App from './src/components/App'; 4 | 5 | export const wrapRootElement = ({ element }) => { 6 | return {element}; 7 | }; 8 | -------------------------------------------------------------------------------- /gatsby-config.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | siteMetadata: { 3 | title: `Dark Mode (minimal example)`, 4 | description: `An MVP dark-mode, from scratch.`, 5 | author: `@gatsbyjs`, 6 | }, 7 | plugins: [ 8 | `gatsby-plugin-styled-components`, 9 | 10 | // this (optional) plugin enables Progressive Web App + Offline functionality 11 | // To learn more, visit: https://gatsby.dev/offline 12 | // `gatsby-plugin-offline`, 13 | ], 14 | }; 15 | -------------------------------------------------------------------------------- /gatsby-node.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Implement Gatsby's Node APIs in this file. 3 | * 4 | * See: https://www.gatsbyjs.org/docs/node-apis/ 5 | */ 6 | 7 | // You can delete this file if you're not using it 8 | -------------------------------------------------------------------------------- /gatsby-ssr.js: -------------------------------------------------------------------------------- 1 | import React from 'react'; 2 | import Terser from 'terser'; 3 | 4 | import { 5 | COLOR_MODE_KEY, 6 | COLORS, 7 | INITIAL_COLOR_MODE_CSS_PROP, 8 | } from './src/constants'; 9 | 10 | import App from './src/components/App'; 11 | 12 | function setColorsByTheme() { 13 | const colors = '🌈'; 14 | const colorModeKey = '🔑'; 15 | const colorModeCssProp = '⚡️'; 16 | 17 | const mql = window.matchMedia('(prefers-color-scheme: dark)'); 18 | const prefersDarkFromMQ = mql.matches; 19 | const persistedPreference = localStorage.getItem(colorModeKey); 20 | 21 | let colorMode = 'light'; 22 | 23 | const hasUsedToggle = typeof persistedPreference === 'string'; 24 | 25 | if (hasUsedToggle) { 26 | colorMode = persistedPreference; 27 | } else { 28 | colorMode = prefersDarkFromMQ ? 'dark' : 'light'; 29 | } 30 | 31 | let root = document.documentElement; 32 | 33 | root.style.setProperty(colorModeCssProp, colorMode); 34 | 35 | Object.entries(colors).forEach(([name, colorByTheme]) => { 36 | const cssVarName = `--color-${name}`; 37 | 38 | root.style.setProperty(cssVarName, colorByTheme[colorMode]); 39 | }); 40 | } 41 | 42 | const MagicScriptTag = () => { 43 | const boundFn = String(setColorsByTheme) 44 | .replace("'🌈'", JSON.stringify(COLORS)) 45 | .replace('🔑', COLOR_MODE_KEY) 46 | .replace('⚡️', INITIAL_COLOR_MODE_CSS_PROP); 47 | 48 | let calledFunction = `(${boundFn})()`; 49 | 50 | calledFunction = Terser.minify(calledFunction).code; 51 | 52 | // eslint-disable-next-line react/no-danger 53 | return