wp-calypso/client/my-sites/exporter/index.js

import page from '@automattic/calypso-router';
import { get } from 'lodash';
import { makeLayout, render as clientRender } from 'calypso/controller';
import { navigation, redirectWithoutSite, siteSelection, sites } from 'calypso/my-sites/controller';
import { exportSite } from 'calypso/my-sites/exporter/controller';

export default function () {
	page( '/export', siteSelection, navigation, sites, makeLayout, clientRender );

	page(
		'/export/:site_id',
		siteSelection,
		navigation,
		redirectWithoutSite( '/export' ),
		exportSite,
		makeLayout,
		clientRender
	);

	// Redirect any other child routes to parent `/export`.
	page( '/export/*/:site_id', ( context ) => {
		const site_id = get( context, 'params.site_id' );
		return page.redirect( `/export/${ site_id }` );
	} );
}