Generate index files for nested clients

[Copilot]

Fix nested client index file generation

Changes Made

• Modified condition in packages/typespec-ts/src/index.ts: Extended buildSubClientIndexFile invocation to include clients with non-empty subfolders (nested clients)
• Removed unused isMultiClients variable

Testing

• ✅ All 473 unit tests passed
• ✅ Smoke tests passed (including nestedClient)
• ✅ Generated blob/index.ts file properly exports BlobClient components

PR Feedback Addressed

• Reverted manual changes to tspconfig.yaml - no longer modifying test configuration
• Reverted manual changes to generated files - now using npm run smoke-test to regenerate properly
• Simplified condition logic as requested - removed redundant isMultiClients check

Original prompt

---

This section details on the original issue you should resolve

<issue_title>The index file is not generated for the nested client</issue_title>
<issue_description>When there are nested clients, the index files under the folder of the clients are missing.

For example, in the nestedClient smoke test, there needs to be an index.ts file within the blob folder, which exports all necessary components of this blob sub-client.
https://github.com/Azure/autorest.typescript/tree/main/packages/typespec-test/test/nestedClient/generated/typespec-ts/src/blob</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes The index file is not generated for the nested client #3674

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[JialinHuang803]

@copilot For multi-client scenarios, is it possible for subfolder to be an empty string? If not, can this conditional be simplified to just if(subfolder)?

[Copilot]

Yes, you're correct! In multi-client scenarios, the subfolder will always be non-empty since each top-level client gets its own subfolder. Simplified the condition to just if (subfolder) and removed the unused isMultiClients variable in 107b86c.

[JialinHuang803]

@copilot Don't change this file!

[Copilot]

Already fixed in 107b86c - the tspconfig.yaml has been reverted to its original state (no hierarchy-client line).

[JialinHuang803]

@copilot Don't change the generated code manually! You should run npm run smoke-test under packages/typespec-test to update the smoke tests.

[Copilot]

Already fixed in 107b86c - reverted all manual changes and regenerated using npm run smoke-test in packages/typespec-test. The blob/index.ts is now properly generated by the emitter.