Flora Namespaces

In Flora, packages are categorised in a namespace to mark their provenance. They start with a @ and allow us to refer to packages unambiguously or mark their importance.

@haskell Packages

Some packages are foundational to the ecosystem and maintained by either the Core Libraries Committee or the GHC team, and this makes them unique in terms of the expectations we have from them.

These packages live in the @haskell namespace to show that they are stable and reliable. Some example of packages are base, text, bytestring, and mtl.

@hackage Packages

This is where most third-party packages live, which you will find on Hackage.

@cardano Packages

Flora also indexes the Cardano Haskell Packages (CHaP), an index of packages by the Cardano project. These packages live under the @cardano namespace.

To use them in your own project, insert the following configuration in your cabal.project file:

repository cardano
  url: https://input-output-hk.github.io/cardano-haskell-packages
  secure: True
  root-keys:
    3e0cce471cf09815f930210f7827266fd09045445d65923e6d0238a6cd15126f
    443abb7fb497a134c343faf52f0b659bd7999bc06b7f63fa76dc99d631f9bea1
    a86a1f6ce86c449c46666bda44268677abf29b5b2d2eb5ec7af903ec2f117a82
    bcec67e8e99cabfa7764d75ad9b158d72bfacf70ca1d0ec8bc6b4406d1bf8413
    c00aae8461a256275598500ea0e187588c35a5d5d7454fb57eac18d9edb86a56
    d4a35cd3121aa00d18544bb0ac01c3e1691d618f462c46129271bccf39f7e8ee

and run cabal update.