preliminaries: A larger alternative to the Prelude.

[ bsd3, library, prelude ] [ Propose Tags ]
Dependencies abstract‑par (>=0.3.3 && <1), base (>=4.9.0 && <5), bifunctors (>=5.4.1 && <6), classy‑prelude‑conduit (>=1.0.0 && <2), data‑default (>=0.7.1 && <1), microlens‑contra (>=0.1.0 && <1), microlens‑platform (>=0.3.7 && <1), monad‑par (>=0.3.4 && <1), monad‑parallel (>=0.7.2 && <1), mono‑traversable‑instances (>=0.1.0 && <1), mtl (>=2.2.1 && <3), parallel (>=3.2.1 && <4), stm‑conduit (>=3.0.0 && <4), string‑conversions (>=0.4 && <1) [details]
License BSD-3-Clause
Copyright © 2016 Yghor Kerscher
Author Yghor Kerscher
Category Prelude
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Source repo head: git clone
Uploaded by yghor at Wed Feb 1 21:20:37 UTC 2017
Distributions NixOS:
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Status Docs available [build log]
Last success reported on 2017-02-01 [all 1 reports]
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A GHC-only alternative to the Prelude with a large amount of imports available by default.

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Maintainer's Corner

For package maintainers and hackage trustees

Readme for preliminaries-

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Build Status Hackage BSD3 license

The Haskell Report specifies the Prelude with a minimal amount of definitions that are always available in scope for application writers. Due to its simplicity and frugality, multiple alternatives and support libraries were devised to improve upon it, including:

preliminaries is one of such alternatives and builds upon classy-prelude-conduit, with the following functionality out-of-the-box:

  • Data manipulation and structures — i.e. microlens + mono-traversable
  • Streaming
  • Concurrency
  • Parallelism
  • Read-only, write-only and read-write environments — i.e. mtl

Contrary to most other alternatives, there is no attempt at being minimal. Nevertheless, it's shipped with microlens instead of the full-blown lens.


To use it, put the following in your .cabal file, ignoring the “…” for omited parts:

executable your-executable
  language:           Haskell2010
  default-extensions: NoImplicitPrelude
  build-depends:      preliminaries >= 0.1.6 < 1

And on each file, add import Preliminaries.

You might also want to look at this project’s Cabal file to check on useful GHC extensions to enable alongside this change.


In case something does not build or you find other unpleasant aspects of the library, please send a pull request or contact the maintainer.