✨ Add support for typing.TypeAliasType as valid parameter type.

[zarch]

See discussion for further details and sample code.

[github-actions]

📝 Docs preview for commit e13d1d8 at: https://45f079b8.typertiangolo.pages.dev

[svlandeg]

Hi @zarch, thanks for the contribution, we appreciate it!

The CI is currently failing - could you look into that? I'll put the PR in draft in the meantime. The review process will go much smoother once the CI is green 😉

[github-actions]

📝 Docs preview for commit c97aff6 at: https://8682c9ff.typertiangolo.pages.dev

[zarch]

@svlandeg I've fixed all the CI. To properly handle the TypeAliasType I also have to update mypy version to v1.10, I don't know if this might be an issue.

The only failing check is the one using Python 3.7 (not supported), se my other PR to bump the minimum requirement to Python 3.8.
Therefore, these change should be put on queue with: 🔥 Drop support for Python 3.7

[lachaib]

Hello,

I was digging on the topic on that matter and I think this PR is incomplete:

• one of the things I'm trying to achieve is to share parameter definition across sub-commands, e.g.

type Name = Annotated[str, Argument(help="The human in front of the screen")]

@app.command()
def greet(name: Name):
      echo(f"Hello {name}")
      
@app.command()
def farewell(name: Name):
      echo(f"Good bye, {name}")

To get it working, I had to modify utils._split_annotation_from_typer_annotations to enable extraction of ParameterInfo from the type alias
(basically added a recursive call to same method with base_annotation.__value__)

• also, because it can be useful to support nested annotations under the TypeAliasType, I had to unwrap a bit further down the types before reaching get_click_type
  e.g.

from typing import Doc
from pydantic import PositiveInt, validate_call

type Name = Annotated[str, Doc("An human's full name")]
type Age = Annotated[PositiveInt, Doc("An human's age")]

type Identity = tuple[Name, Age]

@app.command()
@validate_call
def register_to_vote(user_identity: Identity):
      ...

Happy to discuss/help on this topic