How to alias root url to a specific page in next.js

I have been working on a next.js + flask app. The landing page ideally should point to a specific page called signals instead of an empty index.js

I tried more complicated ways following some Q&As I found on Github and StackOverflow. It turns out all I need to change is the top level next.config.js

module.exports = {
  exportPathMap: function() {
    return {
      '/', {page: '/signals'}
    }
  }
};