page: String - the page inside the pages directory to render
query: Object - the query object passed to getInitialProps when prerendering. Defaults to {}
The exported pathname can also be a filename (for example, /readme.md), but you may need to set the Content-Type header to text/html when serving its content if it is different than .html.
Adding a trailing slash
It is possible to configure Next.js to export pages as index.html files and require trailing slashes, /about becomes /about/index.html and is routable via /about/. This was the default behavior prior to Next.js 9.
To switch back and add a trailing slash, open next.config.js and enable the trailingSlash config:
next.config.js module.exports = {
  trailingSlash: true,
}
Customizing the output directory
next export will use out as the default output directory, you can customize this using the -o argument, like so: