Failed to construct 'WebSocket': The URL 'ws://localhost:undefined/' is invalid.

[casperkwok]

Uncaught (in promise) SyntaxError: Failed to construct 'WebSocket': The URL 'ws://localhost:undefined/' is invalid.

[heo001997]

@zanekwok bro, add this config in vite.config.js

    server: {
      port: 5173,
      strictPort: true,
      hmr: {
        port: 5173,
      },
    },

[RomkaLTU]

@zanekwok bro, add this config in vite.config.js

    server: {
      port: 5173,
      strictPort: true,
      hmr: {
        port: 5173,
      },
    },

This will crash browser on every background/index.js edit. Didn't find any better option though.