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Language server: Thread panicked

crash

help wantedLarger than "good first issue", but still well-defined and ready for someone to pick upLarger than "good first issue", but still well-defined and ready for someone to pick up

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

Status: Open.

Bug

#3612 In facebook/pyrefly;

· Quetute opened on May 29, 2026

Document (and optionally ship) Pyrefly as a Claude Code LSP for semantic navigation

documentationImprovements or additions to documentationImprovements or additions to documentation

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

Status: Open.

Feature

#3611 In facebook/pyrefly;

· ytausch opened on May 29, 2026

Feat: update baseline file on file save

help wantedLarger than "good first issue", but still well-defined and ready for someone to pick upLarger than "good first issue", but still well-defined and ready for someone to pick up

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

Status: Open.

Feature

#3609 In facebook/pyrefly;

· yangdanny97 opened on May 29, 2026

Feature/RFC show structural definition when hovering over a typed dict

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

needs-discussionAn issue where it's not clear whether there is a bug or we are behaving as expected.An issue where it's not clear whether there is a bug or we are behaving as expected.

Status: Open.

Feature

#3608 In facebook/pyrefly;

· yangdanny97 opened on May 29, 2026

Pyrefly Fails to Resolve Implicit Imports When Using a Config

configuration

Status: Open.

Bug

#3607 In facebook/pyrefly;

· saimster-arista opened on May 28, 2026

Generic input of type TypeVar("T", pl.DataFrame, pl.LazyFrame) to a function doesn't narrow on join

Status: Open.

#3605 In facebook/pyrefly;

· ajohnson5 opened on May 28, 2026

Pyrefly doesn't narrow types in if conditions

Status: Open.

#3603 In facebook/pyrefly;

· sergey-miryanov opened on May 28, 2026

semantic highlighting not working in vscode

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

needs-triage

Status: Open.

Bug

#3602 In facebook/pyrefly;

· DetachHead opened on May 28, 2026

Descriptor access collapses intersection types

Status: Open.

#3601 In facebook/pyrefly;

· benjykh opened on May 28, 2026

[VSCode][ipynb] Changing kernels causes hover to stop working

help wantedLarger than "good first issue", but still well-defined and ready for someone to pick upLarger than "good first issue", but still well-defined and ready for someone to pick up

language-serverIssues specific to our IDE integration rather than type checkingIssues specific to our IDE integration rather than type checking

notebook

Status: Open.

Bug

#3598 In facebook/pyrefly;

· kinto0 opened on May 27, 2026

Pydantic: parent fields in subclasses are incorrectly assumed to exist / not exist

pydanticIssues related to support for PydanticIssues related to support for Pydantic

typechecking

Status: Open.

Bug

#3596 In facebook/pyrefly;

· arogozhnikov opened on May 27, 2026

always truthy types are incorrectly treated as if they can be falsy

narrowingIssues with narrowing - root cause is usually narrowing, flow handling, or bothIssues with narrowing - root cause is usually narrowing, flow handling, or both

typechecking

Status: Open.

Bug

#3595 In facebook/pyrefly;

· DetachHead opened on May 27, 2026