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gatsby-ssr.js
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gatsby-ssr.js
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const React = require("react")
exports.onRenderBody = ({ setPreBodyComponents }) => {
setPreBodyComponents([
React.createElement("script", {
dangerouslySetInnerHTML: {
__html: `
(() => {
window.__onThemeChange = function() {};
function setTheme(newTheme) {
window.__theme = newTheme;
preferredTheme = newTheme;
document.body.className = newTheme;
document.body.dataset.theme = newTheme;
window.__onThemeChange(newTheme);
}
let preferredTheme
try {
preferredTheme = localStorage.getItem('theme')
} catch (err) {}
window.__setPreferredTheme = newTheme => {
setTheme(newTheme)
try {
localStorage.setItem('theme', newTheme)
} catch (err) {}
}
let darkQuery = window.matchMedia('(prefers-color-scheme: dark)')
darkQuery.addEventListener('change', e => {
window.__setPreferredTheme(e.matches ? 'dark' : 'light')
})
setTheme('light' || (darkQuery.matches ? 'dark' : 'light'))
})()
`,
},
}),
])
}