Phantom State Transformer. Like State Monad, but without values.

LTS Haskell 21.13:
Stackage Nightly 2023-09-27:
Latest on Hackage:

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BSD-3-Clause licensed and maintained by Daniel Casanueva (daniel.casanueva `at`
This version can be pinned in stack with:phantom-state-,1467

Module documentation for

Depends on 2 packages(full list with versions):
Used by 1 package in nightly-2023-09-27(full list with versions):

A monad transformer that mimics the State Monad Transformer from the transformers package, but dropping the values. In those cases that you want to use the State Monad but you only care about effects and how the state changes, use this library to earn a plus of efficiency.


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