添加依赖项后如何重新加载项目？

Question

During the development, I've added a library to package.yaml and the GHCi is already started.

For example, I've added the bytestring library:

executables:
  playground-exe:
    main:                Main.hs
    source-dirs:         app
    ghc-options:
    - -threaded
    - -rtsopts
    - -with-rtsopts=-N
    dependencies:
    - playground
    - text
    - bytestring

Because I use it in a file that is called Families.hs and it contains the following code:

{-# LANGUAGE  TypeFamilies, OverloadedStrings #-}

module Families where

import Data.Word (Word8)
import qualified Data.ByteString as BS 

When I try to load the file, it complains:

:l ./src/Families.hs
[1 of 1] Compiling Families         ( src/Families.hs, interpreted )

src/Families.hs:6:1: error:
    Could not load module ‘Data.ByteString’
    It is a member of the hidden package ‘bytestring-0.10.8.2’.
    You can run ‘:set -package bytestring’ to expose it.
    (Note: this unloads all the modules in the current scope.)
    Use -v to see a list of the files searched for.
  |
6 | import qualified Data.ByteString as BS
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.

The question is, how to reload the whole project into the GHCi and allow usage of bytestring library.

UPDATE
I also tried with :reload and got

:reload
[1 of 1] Compiling Families         ( src/Families.hs, interpreted )

src/Families.hs:6:1: error:
    Could not load module ‘Data.ByteString’
    It is a member of the hidden package ‘bytestring-0.10.8.2’.
    You can run ‘:set -package bytestring’ to expose it.
    (Note: this unloads all the modules in the current scope.)
    Use -v to see a list of the files searched for.
  |
6 | import qualified Data.ByteString as BS
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Failed, no modules loaded.

Answer 1

I see you are using Spacemacs along with intero . In this case you may restart whole intero process by typing Mx intero-restart RET , or M-RET ir which will reload all stack dependencies.

Another way to do this is to put your cursor on the error import and type Cc Cr to let the intero automatically fix the issue.