We are likely going to stop supporting this package in the near future. Changes in phpstan's autoloading are surfacing load order / class existence issues leading to classes being generated when they should be found via Composer's autoloading. As https://github.com/bitExpert/phpstan-magento does not have the same issue and does provide similar functionality we suggest checking it out instead as we will likely adopt it for our uses.

PHPStan Extension - Magento 2 Magic Methods

The extension bootstraps the same autoloader that is run when using Magento 2's unit tests. By default it will place the generated class under var/. Change the environment variable TESTS_TEMP_DIR to change the folder.

Installation Instructions via Composer

composer require --dev fooman/phpstan-magento2-magic-methods:^0.7

Note on required use of phpstan/extension-installer

Manual installation

If the use of phpstan/extension-installer is not working for you undo the installation by adding

    "replace": {
        "phpstan/extension-installer": "*"
    },

to your project's composer.json file. Then manually include extension.neon in your project's PHPStan config:

includes:
    - vendor/fooman/phpstan-magento2-magic-methods/extension.neon

Or as an alternative approach you can check out https://github.com/bitExpert/phpstan-magento