Fix Context.command.params type hinting for better IDE support

[ashupal86]

Fix IDE autocompletion for typer.Context

Fixes: #346

What was broken

When using typer.Context in callbacks, IDEs couldn't autocomplete parameter attributes:

def my_callback(ctx: typer.Context, param, value):
    params = ctx.command.params
    param.name  # ❌ No autocompletion

What's fixed

Now IDEs provide full autocompletion:

def my_callback(ctx: typer.Context, param, value):
    params = ctx.command.params
    param.name  # ✅ Full autocompletion!

How it works

Added proper type hints to the Context class:

# New in typer/models.py
class TypedCommand(click.Command):
    params: List[click.Parameter]

class Context(click.Context):
    command: TypedCommand

Files changed

• typer/models.py - Added type hints
• tests/test_ctx_params_typing.py - Added tests