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Example code of hxv/phpstan-event-dispatcher-exceptions

Informations about the package phpstan-event-dispatcher-exceptions

Since version 0.12.87 PHPStan analyses and checks thrown exceptions - hooray! pepakriz/phpstan-exception-rules does the same thing (and more), but it's nice to have this out of the box.
However, there are some cases that are "too dynamic" for static analysis to work automatically and thus require additional extensions. This one aims to provide support for Symfony's Event Dispatcher.

Problem

Every time you dispatch an event, any of the handlers can throw an exception - since PHPStan doesn't know anything about them you can:

If you don't choose first or last option, you have to be very careful when modifying handlers - new exceptions can cause problems. If you do - well, you probably do not need this extension.

Solution

Solution to above problem is to annotate exceptions with @throws tag on class level for every event:

Having exceptions assigned to events analysis can be more complete and warn about new problems.

From now on PHPStan knows that dispatching that event can throw RuntimeException:

There is also a rule to monitor exceptions thrown in subscribers:

Installation

Require extension in composer:

If you have PHPStan Extension Installer - that's all!

If not - you have to manually add extension to your phpstan.neon:

All versions of phpstan-event-dispatcher-exceptions with dependencies

PHP Build Version
Package Version
Requires php Version ^7.1|^8.0
phpstan/phpstan Version ^0.12.87
symfony/event-dispatcher Version ^4.3|^5.0
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