`ampx generate graphql-client-code` fails silently on Linux with no output

[eklanke]

Environment information

### [Bug]: `ampx generate graphql-client-code` fails silently on Linux with no output

**Describe the bug**
The `npx ampx generate graphql-client-code` command fails to generate any Dart model files for a Flutter project. It exits immediately with code `0` and produces no output or error messages, even with the `--debug` flag. The `lib/models` directory is either left empty or is not created at all.

**Expected behavior**
The command should generate Dart model files in the `lib/models` directory corresponding to the schema.

**Actual behavior**
The command completes instantly with no output and no files are generated. `echo $?` returns `0`.

**Environment:**
- Amplify CLI Version: `[email protected]` (or latest)
- Node.js Version: `v22.18.0`
- NPM Version: `10.9.3`
- OS: Linux (Ubuntu on ThinkPad L14 Gen 2)

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**`amplify/data/resource.ts`**

Describe the bug

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Additional context We have exhaustively debugged the local environment, including:

• Ensuring a clean project state (no node_modules, package-lock.json).
• Clearing the global npm cache (npm cache clean --force).
• Upgrading Node.js and npm via nvm to eliminate system-level installation issues.
• Verifying the project root is clean of conflicting files.
• Confirming the sandbox is running and amplify_outputs.json is correct and fully populated with the model introspection schema.
• Removing the lib/models directory before generation.

None of these steps resolved the issue, which strongly points to a bug within the ampx code generation logic itself on this specific platform.

Reproduction steps

To Reproduce Steps to reproduce the behavior:

1. Create a new Flutter project.
2. Initialize an Amplify Gen2 backend with npx ampx init.
3. Define a data schema in amplify/data/resource.ts (see schema below).
4. Run npx ampx sandbox to deploy the backend. The sandbox deploys successfully and creates a valid amplify_outputs.json (see contents below).
5. Run npx ampx generate graphql-client-code.