Skip to content

Fix rx.cond literal string typing #6545

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
Alek99 wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Fix rx.cond literal string typing #6545

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
84ff913
Preserve literal string types in cond
Alek99 May 20, 2026
6a66f73
Address cond typing review feedback
Alek99 May 20, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 14 additions & 0 deletions packages/reflex-components-core/src/reflex_components_core/core/cond.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
from reflex_base.vars import VarData
from reflex_base.vars.base import LiteralVar, Var
from reflex_base.vars.number import ternary_operation
from typing_extensions import LiteralString

from reflex_components_core.base.bare import Bare
from reflex_components_core.base.fragment import Fragment
Expand Down Expand Up @@ -131,6 +132,19 @@ def cond(condition: Any, c1: Any, c2: Component, /) -> Component: ... # pyright

T = TypeVar("T", covariant=True)
U = TypeVar("U", covariant=True)
S = TypeVar("S", bound=LiteralString)
Comment thread
Alek99 marked this conversation as resolved.
Outdated


@overload
def cond(condition: Any, c1: S, c2: S, /) -> Var[S]: ... # pyright: ignore [reportOverlappingOverload]


@overload
def cond(condition: Any, c1: S, c2: Var[U], /) -> Var[S | U]: ... # pyright: ignore [reportOverlappingOverload]


@overload
def cond(condition: Any, c1: Var[T], c2: S, /) -> Var[T | S]: ... # pyright: ignore [reportOverlappingOverload]


@overload
Expand Down
28 changes: 20 additions & 8 deletions tests/units/components/core/test_cond.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -181,20 +181,32 @@ def test_cond_assert_types() -> None:
# non-component, Component -> Component
_ = assert_type(cond(True, "hello", text_comp), Component)

# T, T -> Var[T]
_ = assert_type(cond(True, "hello", "world"), Var[str])
# literal str, literal str -> Var[Literal[...]]
_ = assert_type(cond(True, "hello", "world"), Var[Literal["hello", "world"]])
Comment on lines +185 to +186
Copy link
Copy Markdown
Member

@adhami3310 adhami3310 May 20, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

it would be nice to have another test for T, T, now that strings are handled differently


# T, U -> Var[T | U]
_ = assert_type(cond(True, "hello", 3), Var[str | int])

# T, Var[T] -> Var[T]
_ = assert_type(cond(True, "hello", var_str), Var[str])
# literal str, literal Var[str] -> Var[Literal[...]]
_ = assert_type(cond(True, "hello", var_str), Var[Literal["hello", "a"]])

# Var[T], T -> Var[T]
_ = assert_type(cond(True, var_str, "world"), Var[str])
# literal str, literal Var[str] -> Var[Literal[...]]
_ = assert_type(
cond(True, "hello", LiteralVar.create("world")),
Var[Literal["hello", "world"]],
)

# literal Var[str], literal str -> Var[Literal[...]]
_ = assert_type(cond(True, var_str, "world"), Var[Literal["a", "world"]])

# literal Var[str], literal str -> Var[Literal[...]]
_ = assert_type(
cond(True, LiteralVar.create("hello"), "world"),
Var[Literal["hello", "world"]],
)

# T, Var[U] -> Var[T | U]
_ = assert_type(cond(True, "hello", var_int), Var[str | int])
# literal str, Var[U] -> Var[Literal[...] | U]
_ = assert_type(cond(True, "hello", var_int), Var[int | Literal["hello"]])
Comment thread
Alek99 marked this conversation as resolved.

# Var[T], U -> Var[T | U]
_ = assert_type(cond(True, var_str, 3), Var[int | Literal["a"]])
Expand Down
Loading