Change envvar type from list[str] to Sequence[str]

[thakoreh]

Description

Fixes #283 - envvar type annotation should accept Sequence[str] instead of list[str]

Problem

The parameter type annotation used but Click accepts . This is overly restrictive and doesn't follow Python best practices for type hints.

From the issue:

Why List? Do we expect to mutate the data?
I'd expect immutable types allowed.
Maybe this should be generalized to an abstract interface such as Sequence or Iterable.

Solution

Changed to in all 4 occurrences in .

This allows users to pass any sequence type (tuple, list, etc.) for the parameter.

Changes

• Added to imports from
• Changed all 4 occurrences of to in envvar type annotations

[thakoreh]

I noticed the mypy check is still failing. The issue is that while the PR updated OptionInfo and ArgumentInfo to use Sequence[str] for envvar, the TyperOption and TyperArgument classes in typer/core.py still use list[str].

You need to update the envvar parameter type in both classes in typer/core.py:

# In TyperArgument (around line 263)
envvar: str | Sequence[str] | None = None,

# In TyperOption (around line 410)
envvar: str | Sequence[str] | None = None,

The Sequence type is already imported at the top of the file.

I've created a branch with the fix at https://github.com/thakoreh/typer/tree/pr-1610 if you'd like to reference it.