Stack (the Haskell Tool Stack) is a program for developing Haskell projects. It is aimed at new and experienced users of Haskell and seeks to support them fully on Linux, macOS and Windows. For information about how to use Stack, see https://docs.haskellstack.org. If building a stack executable for distribution, please download the source code from https://github.com/commercialhaskell/stack/releases and build it with Stack in order to ensure identical behaviour to official binaries. This package is provided on Hackage for convenience and bootstrapping purposes. Currently, the library exposed by the package is intended for use only by the executable. The library's API may change significantly, even between minor releases.