i have installed version base of MMORPG branch:
sandro@elitebook:~/Scaricati/my-rpg-game$ npm run dev
> dev
> rpgjs dev
file:///home/sandro/Scaricati/my-rpg-game/node_modules/@rpgjs/compiler/lib/serve/index.js:22
(_a = process.env).VITE_GAME_URL ?? (_a.VITE_GAME_URL = `http://localhost:${options.port}`);
^
SyntaxError: Unexpected token '?'