This can happen even for mid-size codebases where (for some reason) not a single entrypoint is found (e.g. disabled vendor provider). Or when most usages are excluded. Then, everything becomes dead and complex usage graph can cause this issue.

How to recognize it:

• PHPStan execution gets stuck after storing result cache:

$ vendor/bin/phpstan -vv
Result cache restored. 0 files will be reanalysed.
 272/272 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100% < 1 sec/< 1 sec

Result cache is saved.

(hanging)

• It disappears with reportTransitivelyDeadMethodAsSeparateError: true