- Create a new project, routing-in-snap, with a simple stack template. We use lts-9.1 as a resolver package archive. You can use the latest one available on Stackage. Just make sure that you use the same resolver later to solve the dependency constraints:
stack --resolver lts-9.1 new routing-in-snap simple
- Add a dependency on the following libraries in the build-depends subsection of the executable section, as follows:
executable routing-in-snap hs-source-dirs: src main-is: Main.hs default-language: Haskell2010 build-depends: base >= 4.7 && < 5 , snap-server , snap-core , snap , lens , bytestring , text
- Use the following command to solve the dependency constraints to update the stack.yaml file:
stack --resolver lts-9.1 ...