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.

[bozzhik]

@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.

This option worked for me. Just when changing the background.ts file, the extension closes and you just need to open it again, but HMR works fine

mbozhik/elements-inspector-extension@42cee8b