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ghcid

  • One of the most important tool for Haskell Dev Environments

  • One can use it along any editors without integrating it

  • Fake type-of-expression support: just add :: () to the type you want to check

  • Reload your web app on every edit

ghcid \
    --command "stack ghci" \
    --test "DevelMain.update"
# It calls DevelMain.update function on every successful compile
  • Run your tests suite on every edit
ghcid \
    --command "stack ghci cardano-sl-wallet-new:lib cardano-sl-wallet-new:test:wallet-new-specs --ghci-options=-fobject-code" \
    --test "main"
# Specify which package targets to load
# Specify the test-suite to run

ghcid --command "stack ghci server:lib server:server-test --ghci-options=-fobject-code" --test="main"
  • Run test target
ghcid --command "stack ghci projectName:testSuiteName"

Commands

  • For a TH heavy project
ghci --command "stack ghci --ghci-options=-fobject-code"
  • Pick a single executable at target
ghci --command "stack ghci package:exe:main-node"
  • Defer type errors
ghci --command "stack ghci ghci-options=-fdefer-type-errors"

Resources