Next.js - Force the creation of an index.html file for every page

next.config.js

module.exports = { 
  // forcing the creation of an index.html for every page to allow
  // providers serving pages without having to add .html to the url
  exportPathMap: async function (defaultPathMap) {
    const pathMap = {};

    for (const [path, config] of Object.entries(defaultPathMap)) {
      if (path === "/") {
        pathMap[path] = config;
      } else {
        pathMap[`${path}/index`] = config;
      }
    }

    return pathMap;
  },
  
  // ...
}