504 (Outdated Optimize Dep) while using react-vite

Try adding this code to your vite.config.js file:

import { defineConfig } from "vite";

export default defineConfig({
  ...
  optimizeDeps: {
    exclude: ['js-big-decimal']
  }
});

then delete your node_modules folder and reinstalled all your deps.

There’s an ongoing discussion on this issue on github vite github issue.