Packages

Haskell packages can be installed in user level (global, like npm install -g) or project level (local, like npm install).

The default behavior of cabal is user level:

cabal install <package-name>

To install package in project level, you need create a sandbox beforehand:

cabal sandbox init     # run in project root folder
cabal install <package-name>

The global packages are stored in $HOME/.cabal/packages folder, while local packages are stored in $PROJ_ROOT/.cabal-sandbox/lib folder.