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import { Children } from 'react';
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import Document, { Html, Head, Main, NextScript } from 'next/document';
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import { ServerStyleSheets } from '@material-ui/core/styles';
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export default class MyDocument extends Document {
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render(): JSX.Element {
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return (
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<Html lang="en">
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<Head>
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<meta charSet="utf-8" />
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</Head>
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<body>
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<Main />
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<NextScript />
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</body>
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</Html>
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);
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}
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}
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// `getInitialProps` belongs to `_document` (instead of `_app`),
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// it's compatible with server-side generation (SSG).
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MyDocument.getInitialProps = async (ctx) => {
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// Render app and page and get the context of the page with collected side effects.
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const sheets = new ServerStyleSheets();
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const originalRenderPage = ctx.renderPage;
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ctx.renderPage = () =>
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originalRenderPage({
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enhanceApp: (App) => (props) =>
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sheets.collect(
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<App
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/* eslint-disable react/jsx-props-no-spreading */
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{...props}
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/>,
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),
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});
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const initialProps = await Document.getInitialProps(ctx);
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return {
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...initialProps,
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// Styles fragment is rendered after the app and page rendering finish.
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styles: [
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...Children.toArray(initialProps.styles),
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sheets.getStyleElement(),
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],
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};
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};
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