flow is a representation of "flow concept" using programming language.
For more details, please visit the documentation website.
This package is managed by cabal. You can use cabal repl to immediately run the program during development.
For building WebAssembly binary, the additional GHC backend should be installed. Please refer to the page below:
https://ghc.gitlab.haskell.org/ghc/doc/users_guide/wasm.html
According to the page, ghc-wasm-meta is useful to setup the backend. Note that you may need to set the environment variable FLAVOUR to 9.6 before executing ./setup.sh.