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Showing content from https://github.com/commercialhaskell/stack/issues/5421 below:

`stack repl subpackage` compile time cwd is different from `stack build subpackage` one · Issue #5421 · commercialhaskell/stack · GitHub

The current working dir at compile time is different between stack build and stack repl. It likely makes template haskell io computations relying in cwd fail, cause the relative file or directory usually does not exist.
This in turn makes that code not usable in a ide (hls, ghcide) that uses hie-bios to manage ghc session, as hie-bios uses stack repl underneath for stack projects.
(original issue haskell/haskell-language-server#481)

1. Create a simple stack project with a main package with an exe and a subpackage with a lib
2. Create in the subpackage lib a module with

import System.Directory
import Language.Haskell.TH
import Language.Haskell.TH.Syntax

cwd :: FilePath
cwd = $$(runIO getCurrentDirectory >>= \d-> fmap TExp (lift (d :: FilePath)))

and in the main package an executable with

1. Run command stack run and observe cwd is /path/to/main/package/subpackage
2. Run command stack repl subpackage or stack repl and observe cwd evaluation gives us /path/to/main/package

Both paths should be equal.

stack build uses the subpackage path and stack repl the main package one

$ stack --version
Version 2.5.1  x86_64 hpack-0.33.0

• Official binary, downloaded from stackage.org or fpcomplete's package repository

Vlix, michaelpj, AlistairB and fendor

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