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Fix incorrect writing of custom documents #4361

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Fix incorrect writing of custom documents #4361

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102 changes: 52 additions & 50 deletions beta/src/pages/_document.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -5,60 +5,62 @@
import * as React from 'react';
import Document, {Html, Head, Main, NextScript} from 'next/document';

const MyDocument = () => {
// @todo specify language in HTML?
return (
<Html lang="en">
<Head />
<body className="font-sans antialiased text-lg bg-wash dark:bg-wash-dark text-secondary dark:text-secondary-dark leading-base">
<script
dangerouslySetInnerHTML={{
__html: `
(function () {
function setTheme(newTheme) {
window.__theme = newTheme;
if (newTheme === 'dark') {
document.documentElement.classList.add('dark');
} else if (newTheme === 'light') {
document.documentElement.classList.remove('dark');
class MyDocument extends Document {
render() {
// @todo specify language in HTML?
return (
<Html lang="en">
<Head />
<body className="font-sans antialiased text-lg bg-wash dark:bg-wash-dark text-secondary dark:text-secondary-dark leading-base">
<script
dangerouslySetInnerHTML={{
__html: `
(function () {
function setTheme(newTheme) {
window.__theme = newTheme;
if (newTheme === 'dark') {
document.documentElement.classList.add('dark');
} else if (newTheme === 'light') {
document.documentElement.classList.remove('dark');
}
}
}

var preferredTheme;
try {
preferredTheme = localStorage.getItem('theme');
} catch (err) { }

window.__setPreferredTheme = function(newTheme) {
preferredTheme = newTheme;
setTheme(newTheme);

var preferredTheme;
try {
localStorage.setItem('theme', newTheme);
} catch (err) { }
};

var initialTheme = preferredTheme;
var darkQuery = window.matchMedia('(prefers-color-scheme: dark)');

if (!initialTheme) {
initialTheme = darkQuery.matches ? 'dark' : 'light';
}
setTheme(initialTheme);

darkQuery.addEventListener('change', function (e) {
if (!preferredTheme) {
setTheme(e.matches ? 'dark' : 'light');

window.__setPreferredTheme = function(newTheme) {
preferredTheme = newTheme;
setTheme(newTheme);
try {
localStorage.setItem('theme', newTheme);
} catch (err) { }
};

var initialTheme = preferredTheme;
var darkQuery = window.matchMedia('(prefers-color-scheme: dark)');

if (!initialTheme) {
initialTheme = darkQuery.matches ? 'dark' : 'light';
}
});
})();
`,
}}
/>
<Main />
<NextScript />
</body>
</Html>
);
};
setTheme(initialTheme);

darkQuery.addEventListener('change', function (e) {
if (!preferredTheme) {
setTheme(e.matches ? 'dark' : 'light');
}
});
})();
`,
}}
/>
<Main />
<NextScript />
</body>
</Html>
);
}
}

export default MyDocument;