I am trying to run my Node.js application on a Namecheap server using the Node.js Selector, but it's unable to start up because it's requireing the startup file

Startup file (I don't think I can just change to cjs, as my actual app is Nuxt 3. This is just an example):

import http from 'http';
var server = http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    var message = 'It works!\n',
        version = 'NodeJS ' + process.versions.node + '\n',
        response = [message, version].join('\n');
    res.end(response);
});
server.listen();

Error:

internal/modules/cjs/loader.js:948
    throw new ERR_REQUIRE_ESM(filename);
    ^

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /home/wiebdmbt/jawedding/app.mjs
    at new NodeError (internal/errors.js:322:7)
    at Module.load (internal/modules/cjs/loader.js:948:11)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Module.require (internal/modules/cjs/loader.js:974:19)
    at require (internal/modules/cjs/helpers.js:93:18)
    at startApplication (/usr/local/lsws/fcgi-bin/lsnode.js:48:15)
    at Object.<anonymous> (/usr/local/lsws/fcgi-bin/lsnode.js:16:1)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32) {
  code: 'ERR_REQUIRE_ESM'
}