If you visit the Stack website at https://www.stackage.org/, you will notice that Stack publishes nightly packages and Long Term Support (LTS) packages. While creating a new project, Stack downloads the latest LTS package list. It is also possible to provide the name of the LTS package explicitly by providing stack new –resolver lts-9.2.
In the project directory, you will notice two files:
- <project>.yaml
- <project>.cabal
The YAML file is created by Stack to specify various things, including LTS version, external packages, and so on. The .cabal file is the main project file for the Haskell package. The cabal is the tool that Stack uses internally to build, package, and so on. However, there are several advantages of using Stack as Stack also supports pre-built packages and manages cabal well. Furthermore, Stack also supports the Docker environment.