Web Bundling failed: "failed to deserialize; expected an object-like struct named Specifier, found ()"

[dacoto]

What happened?

Failed to run npm run web (expo start --web)

Logs for your project will appear below. Press Ctrl+C to exit.
Web Bundling failed 513ms node_modules/expo-router/entry.js (1551 modules)
 ERROR  Error: failed to deserialize; expected an object-like struct named Specifier, found ()
    at compileVirtual (/Users/dacoto/Workspace/Transportam/app/node_modules/uniwind/dist/metro/metro-transformer.cjs:1539:25)
    at async Object.transform (/Users/dacoto/Workspace/Transportam/app/node_modules/uniwind/dist/metro/metro-transformer.cjs:1628:23)

Steps to Reproduce

1. Install uniwind with expo@55
2. Run web (npm run web)

Snack or Repository Link (Optional)

https://github.com/dacoto/transportam-app/tree/expo-router-uniwind

Uniwind version

uniwind pro: 1.0.0-rc.4

React Native Version

0.83.2

Platforms

Web

Expo

Yes

Additional information

• I've searched for similar issues in this repository and found none
• I am a Uniwind Pro user

[dacoto]

Network error 500: http://localhost:8081/node_modules/expo-router/entry.bundle?platform=web&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.routerRoot=src%2Fapp&unstable_transformProfile=hermes-stable

{
"type": "TransformError",
"lineNumber": 0,
"name": "SyntaxError",
"message": "src/global.css: failed to deserialize; expected an object-like struct named Specifier, found ()",
"stack": "Error: failed to deserialize; expected an object-like struct named Specifier, found ()\n    at compileVirtual (/Users/dacoto/Workspace/Transportam/app/node_modules/uniwind/dist/metro/metro-transformer.cjs:1539:25)\n    at async Object.transform (/Users/dacoto/Workspace/Transportam/app/node_modules/uniwind/dist/metro/metro-transformer.cjs:1628:23)",
"errors": [
{
"description": "src/global.css: failed to deserialize; expected an object-like struct named Specifier, found ()",
"lineNumber": 0
}
]
}

[a-leblond]

Hi !
I'm experiencing the same issue in our repo, rc3 and rc4 doesn't work, rc1 manage to bundle.
I tried to do a repro but I wasn't able to, I'm happy to give more details if needed on our setup.

We are using Expo SDK 54.

[dacoto]

Hi ! I'm experiencing the same issue in our repo, rc3 and rc4 doesn't work, rc1 manage to bundle. I tried to do a repro but I wasn't able to, I'm happy to give more details if needed on our setup.

We are using Expo SDK 54.

I think my repo in the "expo-router-uniwind" branch is enough to replicate the error; I just bought Uniwind Pro and installed it and got the error on web build.

[wcastand]

Latest uniwind doesn't have the issue, so it's linked to a change in uniwind pro

[a-leblond]

Asked Claude, could be linked to this :
parcel-bundler/lightningcss#1081

The issue is in lightningcss v1.30.2 that the rc4 uses.

If I force the 1.30.1 in the package.json it works even with the rc4.

"resolutions": {
  "lightningcss": "1.30.1"
}

[Brentlok]

Yeah that's right, lightningcss introduced a bug in 1.30.2 we've downgraded it in oss version but forgot to do the same for pro. We will release a new pro version soon, for now please use your fix with resolutions

[dacoto]

Asked Claude, could be linked to this : parcel-bundler/lightningcss#1081

The issue is in lightningcss v1.30.2 that the rc4 uses.

If I force the 1.30.1 in the package.json it works even with the rc4.

"resolutions": {
  "lightningcss": "1.30.1"
}

NPM:

"overrides": {
    "lightningcss": "1.30.1",
    "tailwindcss": {
      "lightningcss": "1.30.1"
    },
    "uniwind": {
      "lightningcss": "1.30.1"
    }
  },

[jpudysz]

Fixed in RC.5!

[Brentlok]

parcel-bundler/lightningcss#1081