Upgrade to PHPStan 2.x

[acicovic]

Is your request related to a problem?

We're currently using PHPStan 1.x as our Static Analysis tool.

PHPStan 2.0.0 was released on November 11 2024, though the 1.x branch is still maintained at the time of this writing. According to this blog post:

PHPStan 2.0 = PHPStan 1.12 + Bleeding Edge + BC breaks.

Describe the solution you'd like

Upgrade to PHPStan 2.x following the upgrade guide to take advantage of all the advancements.

[acicovic]

The first step for upgrading is enabling PHPStan's Bleeding Edge mode and fixing all the errors.

Currently, Bleeding Edge results in 63 errors for our codebase.

[acicovic]

Bleeding Edge can be enabled by adding the following to phpstan.neon:

includes:
	- phar://phpstan.phar/conf/bleedingEdge.neon