A framework of packages for building Haskell applications
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Peter J. Jones a90b207eb4
Add additional functions to the top-level module
1 天前
crypto Add additional functions to the top-level module 1 天前
opaleye Rename Opaleye -> Database, add helper function 2 周前
validation validation: Add `HasValidLength' instance for `NonEmpty' 3 周前
.envrc Update for NixOS 19.09 1 个月前
.gitignore Fix a couple typos, improve the shell.nix file 5 个月前
LICENSE Add Iolaus.Opaleye.Config 5 个月前
README.md Typo 3 周前
default.nix Initial import of the iolaus-validations library 3 周前



A set of packages that aim to take care of the 20% overlap between all of the Haskell applications that you write.


This collection of packages uses the “MTL + Classy Optics” style of composing the major components of an application.

For more information we highly recommend the talk by George Wilson entitled Next Level MTL with Classy Optics.


  • crypto: Simplified cryptography operations.

  • opaleye: Database queries and schema migrations.

  • validation: Data validation