Adding a new issue type

To add a new issue type there are a number of required steps, listed below.

Generating a new shortcode

Run bin/max_used_shortcode.php and note the value it printed ($max_shortcode)

Create issue class

Create a class in Psalm\Issue namespace like this:

<?php

namespace Psalm\Issue;

final class MyNewIssue extends CodeIssue 
{
    public const SHORTCODE = 123;
    public const ERROR_LEVEL = 2;
}

For SHORTCODE value use $max_shortcode + 1. To choose appropriate error level see Error levels.

There a number of abstract classes you can extend:

CodeIssue - non specific, default issue. It's a base class for all issues.
ClassIssue - issue related to a specific class (also interface, trait, enum). These issues can be suppressed for specific classes in psalm.xml by using referencedClass attribute
PropertyIssue - issue related to a specific property. Can be targeted by using referencedProperty in psalm.xml
FunctionIssue - issue related to a specific function. Can be suppressed with referencedFunction attribute.
ArgumentIssue - issue related to a specific argument. Can be targeted with referencedFunction attribute.
MethodIssue - issue related to a specific method. Can be targeted with referencedMethod attribute.
ClassConstantIssue - issue related ot a specific class constant. Can be targeted with referencedConstant.
VariableIssue - issue for a specific variable. Targeted with referencedVariable

Add a `config.xsd` entry

All issue types needs to be listed in config.xsd, which is used to validate psalm.xml. Choose appropriate type attribute. E.g. for issues extending PropertyIssue use type="PropertyIssueHandlerType".

Add a doc page for your new issue

Every issue needs to be documented. Create a markdown file in docs/running_psalm/issues folder. Make sure to include a snippet of code illustrating your issue. Important: snippets must use fenced php code block and must include opening PHP tag (<?php). The snippet must actually produce the issue you're documenting. It's checked by our test suite.

Add links to the doc page

Add links to the doc page you created to docs/running_psalm/error_levels.md and docs/running_psalm/issues.md

Run documentation tests

$ vendor/bin/phpunit tests/DocumentationTest.php

It will check whether you did all (or at least most) of the steps above.

Use your new issue type in Psalm core

IssueBuffer::maybeAdd(new MyNewIssue(...))

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