Apply SWC transformation on step functions returned from factory function

[TooTallNate]

Added support for transforming step functions that are returned from factory functions.

What changed?

Enhanced the SWC plugin to detect and transform step functions that are defined within object literals returned by factory functions. The transformation now properly identifies arrow functions with object literal bodies and processes their step functions accordingly.

Added test fixtures to verify the functionality:

• Created test cases for a factory function that returns an object with a step method
• Added corresponding output files for client, step, and workflow modes

How to test?

1. Create a factory function that returns an object with methods marked as steps:

const myFactory = () => ({
  myStep: async () => {
    'use step';
    await fs.mkdir('test');
  },
});

2. Verify that the step function is properly transformed and registered when used in a workflow.

Why make this change?

This enhancement supports a common pattern where developers create factory functions that return objects containing step methods. Without this change, step functions defined in this pattern weren't being properly transformed, which limited the flexibility of the workflow system.

[changeset-bot]

🦋 Changeset detected

Latest commit: 411677b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@workflow/swc-plugin	Patch
@workflow/builders	Patch
@workflow/cli	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/sveltekit	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/nuxt	Patch
@workflow/ai	Patch

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Project	Deployment	Preview	Comments	Updated (UTC)
example-nextjs-workflow-turbopack	Ready	Preview	Comment	Nov 20, 2025 8:10am
example-nextjs-workflow-webpack	Ready	Preview	Comment	Nov 20, 2025 8:10am
example-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-express-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-hono-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-nitro-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-nuxt-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-sveltekit-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workbench-vite-workflow	Ready	Preview	Comment	Nov 20, 2025 8:10am
workflow-docs	Ready	Preview	Comment	Nov 20, 2025 8:10am

[TooTallNate]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Apply SWC transformation on step functions returned from factory function #360 : 2 dependent PRs (#361 , #366 ) 👈 (View in Graphite)
• Add support for closure scope vars in step functions #358
• main

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