Since the update to Angular 18, my bi-lingual website is broken.
After the update it removes the tsconfig.server.json and the related scripts that I was running to serve both languages, it also removed a section from angular.json.

"server": {
          "builder": "@angular-devkit/build-angular:server",
          "options": {
            "outputPath": "dist/morefont-v5/server",
            "main": "server.ts",
            "tsConfig": "tsconfig.server.json",
            "sourceMap": true,
            "optimization": false
          },
          "configurations": {
            "production": {
              "outputHashing": "media",
              "localize":true,
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "sourceMap": false,
              "optimization": true
            }
          },
          "defaultConfiguration": ""
        }

I followed this guide for implementing i18n but since the update there is a lot of errors.

I have tried to create back the tsconfig.server.json but the server/server/mjs is not generated with the build anymore.

my tsconfig.server.json manually replaced in the code after the upgrade

/* To learn more about this file see: https://angular.io/config/tsconfig. */
{
  "extends": "./tsconfig.app.json",
  "compilerOptions": {
    "outDir": "./out-tsc/server",
    "target": "es2016",
    "types": [
      "node",
      "@angular/localize"
    ]
  },
  "files": [
    "src/main.server.ts",
    "server.ts"
  ],
  "angularCompilerOptions": {
    "entryModule": "./src/app/app.server.module#AppServerModule"
  }
}

my proxy server look like this

const express = require("express");
const path = require("path");

const getTranslatedServer = (lang) => {
  const distFolder = path.join(
    process.cwd(),
    `dist/morefont-v5/server/${lang}`
  );
  const server = require(`${distFolder}/main.js`);
  return server.app(lang);
};

function run() {
  const port = 4000;

  // Start up the Node server
  const appFr = getTranslatedServer("fr");
  const appEn = getTranslatedServer("en");

  const server = express();
  server.use("/fr", appFr);
  server.use("/en", appEn);
  server.use("", appEn);

  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

run();

When I run the serve it crash since server.mjs is not generated anymore