fix(cli): replace union-with-None hints in CLI modules

[EnrikoMM]

Summary

• replace X | None annotations in CLI modules with Optional[X]
• update related annotations to Tuple[...] / Union[...] forms in the same paths
• keep behavior unchanged while making type-hint syntax compatible with older Python interpreters

Files

• src/notebooklm/cli/helpers.py
• src/notebooklm/cli/download.py
• src/notebooklm/cli/download_helpers.py
• src/notebooklm/cli/skill.py
• src/notebooklm/cli/generate.py

Co-Authored-By: Oz oz-agent@warp.dev

Summary by CodeRabbit

• Refactor
  • Updated type annotations across CLI modules to use consistent typing conventions, ensuring better code maintainability without any changes to application functionality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e8e0a195-28a2-4815-82ea-24f2fc45feb3

📥 Commits

Reviewing files that changed from the base of the PR and between a997718 and 9d82c5f.

📒 Files selected for processing (5)

• src/notebooklm/cli/download.py
• src/notebooklm/cli/download_helpers.py
• src/notebooklm/cli/generate.py
• src/notebooklm/cli/helpers.py
• src/notebooklm/cli/skill.py

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📝 Walkthrough

Walkthrough

Type annotations across CLI modules were systematically updated from Python 3.10-style union syntax (T | None) to traditional Optional[...] and Tuple[...] constructs, affecting function signatures and internal variable declarations across five files.

Changes

Cohort / File(s)	Summary
Type Annotation Standardization src/notebooklm/cli/download.py, src/notebooklm/cli/download_helpers.py, src/notebooklm/cli/generate.py, src/notebooklm/cli/helpers.py, src/notebooklm/cli/skill.py	Systematically replaced PEP-604 union syntax with Optional[...], Tuple[...], and Union[...] constructs across function parameters, return types, and variable annotations. Examples include converting `str

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 From pipes to Options, the rabbit does hop,
Type hints made consistent, the changes won't stop!
Optional paths and Tuples so neat,
Cleaner annotations, the syntax complete! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(cli): replace union-with-None hints in CLI modules' accurately and specifically describes the main change—replacing PEP 604-style union-with-None type annotations with Optional/Tuple/Union forms across CLI modules.
Docstring Coverage	✅ Passed	Docstring coverage is 92.86% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[gemini-code-assist]

Code Review

This pull request updates type annotations across several CLI modules, replacing the Python 3.10+ union operator (|) with Optional and Union from the typing module. The review feedback suggests maintaining consistency with PEP 585 by using built-in lowercase generics like tuple instead of importing Tuple from the typing module.

[gemini-code-assist]

Since the codebase uses lowercase generics like list, dict, and tuple elsewhere (e.g., dict[str, Any] on line 181), importing Tuple from typing is unnecessary for Python 3.9+ compatibility. It's better to stick to the lowercase tuple for consistency.

Suggested change

	from typing import Any, Optional, Tuple, TypedDict
	from typing import Any, Optional, TypedDict

References

1. PEP 585: Support for the generic alias type in standard collections allows using lowercase types like 'tuple' instead of 'typing.Tuple' for type hints in Python 3.9+. ^(link)

[gemini-code-assist]

For consistency with the rest of the codebase and other CLI modules in this PR (which use lowercase generics like list[str] and tuple[str, ...]), please use the lowercase tuple here instead of Tuple.

Suggested change

	def _resolve_conflict(path: Path) -> Tuple[Optional[Path], Optional[dict]]:
	def _resolve_conflict(path: Path) -> tuple[Optional[Path], Optional[dict]]:

References

1. PEP 585: Support for the generic alias type in standard collections allows using lowercase types like 'tuple' instead of 'typing.Tuple' for type hints in Python 3.9+. ^(link)