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#render header inside layout asynchronously
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You can render your header asynchronously in Next.js by using the next/dynamic function. This function allows you to dynamically import components, which means they will not be included in the initial JavaScript bundle and will be loaded only when needed.
Here is an example of how you can use next/dynamic to asynchronously load a Header component:
import dynamic from 'next/dynamic'
const DynamicHeader = dynamic(() => import('../components/header'), {
loading: () => <p>Loading...</p>,
})
export default function Home() {
return <DynamicHeader />
}
In this example, DynamicHeader is a dynamic version of the Header component. The loading option is a function that returns the JSX to be rendered while the Header component is being loaded.
Please note that the path to the component in the import function must be explicitly written. It can't be a template string nor a variable. The import() has to be inside the dynamic() call for Next.js to be able to match webpack bundles / module ids to the specific dynamic() call and preload them before rendering. dynamic() can't be used inside of React rendering as it needs to be marked in the top level of the module for preloading to work, similar to React.lazy.
You can find more information about dynamic imports in Next.js in the official documentation (https://nextjs.org/docs/pages/building-your-application/optimizing/lazy-loading).