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Using Plugins
Psalm can be extended through plugins to find and fix domain-specific issues.
Using your own plugins
You can write your own Psalm plugins and reference them in your Psalm config.
Using Composer-based plugins
Composer-based plugins provide an easier way to manage and distribute your plugins.
Discovering plugins
Plugins can be found on Packagist by setting the package type filter to psalm-plugin or using the type=psalm-plugin query: https://packagist.org/packages/list.json?type=psalm-plugin
Installing plugins
composer require --dev plugin-vendor/plugin-package
Managing known plugins
Once installed, you can use psalm-plugin tool to enable, disable and show available and enabled plugins.
To enable the plugin, run psalm-plugin enable plugin-vendor/plugin-package. To disable it, run psalm-plugin disable plugin-vendor/plugin-package. psalm-plugin show (as well as bare psalm-plugin) will show you the list of enabled plugins, and the list of plugins known to psalm-plugin (installed into your vendor folder)