/
gatsby-ssr.js
43 lines (36 loc) · 1.01 KB
/
gatsby-ssr.js
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import React from 'react';
export { wrapRootElement } from './src/utils/wrap-root-element';
export const onRenderBody = ({ setHeadComponents }) => {
setHeadComponents([
<script
dangerouslySetInnerHTML={{
__html: `
(function() {
// Update theme to light or dark
function setTheme(theme) {
window.__theme = theme;
console.log('Theme Updated to ' + theme);
document.documentElement.className = theme;
};
// Save user preference
window.__setPreferredTheme = function(theme) {
setTheme(theme);
try {
localStorage.setItem('theme', theme);
} catch(e) {}
};
// Is theme in localStorage
let saved;
try {
saved = localStorage.getItem('theme');
} catch(e) {}
// Check for preference
let isDark = window.matchMedia('(prefers-color-scheme: dark)');
// Set initial theme - setting > os setting > default
setTheme(saved || (isDark.matches ? 'dark' : 'light'));
})();
`,
}}
/>,
]);
};