vimeo/psalm

Generics in throws tag is not supported

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#11,419 opened on May 5, 2025

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Help wanted

Description

https://psalm.dev/r/5024bee2a2

Something like @throws MyException<\DateTime> is not working.

It works fine on phpstan side https://phpstan.org/r/72ff6d55-3b7f-4aca-8d7a-ef306e809205

Contributor guide

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.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
PHP genericsPsalm's type systemPsalm's docblock parsing
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate how Psalm currently parses the @throws tag (likely in a docblock parser or type parser). Compare with phpstan's implementation that supports generics in throws. Look at how generic types are handled in other docblock tags like @param or @return. The implementation may involve updating the throws tag parsing to accept a generic type syntax, similar to other generic type handling in Psalm.