Invalid return type not detected for union types

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5,369 stars (5,369 stars)

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Description

Contributor guide

Research direction

Reproduce the issue using the provided psalm.dev link and examine Psalm's type checker for union types. Look at how return types are validated and find where the union case is missed. Check existing tests for union return types and add a failing test to guide your fix.

Tech stack

php

Domain

tooling

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-2 days

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

PHPGit

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

50