Add a release task

inside an input object for the role checking for unused and undefined
variables.

.gitea/workflows/build.yml

@@ -0,0 +1,52 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches: [master]
+
+jobs:
+  audit:
+    runs-on: haskell
+    steps:
+      - name: Set up environment
+        run: |
+          apt-get update -y
+          apt-get upgrade -y
+          apt-get install -y nodejs pkg-config
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          cabal update
+          cabal install hlint "--constraint=hlint ==3.8"
+      - run: cabal exec hlint -- src tests
+
+  test:
+    runs-on: haskell
+    steps:
+      - name: Set up environment
+        run: |
+          apt-get update -y
+          apt-get upgrade -y
+          apt-get install -y nodejs pkg-config
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: cabal update
+      - name: Prepare system
+        run: cabal build graphql-test
+      - run: cabal test --test-show-details=streaming
+
+  doc:
+    runs-on: haskell
+    steps:
+      - name: Set up environment
+        run: |
+          apt-get update -y
+          apt-get upgrade -y
+          apt-get install -y nodejs pkg-config
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: cabal update
+      - run: cabal haddock --enable-documentation

.gitea/workflows/release.yml

@@ -0,0 +1,23 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - '**'
+
+jobs:
+  release:
+    runs-on: haskell
+    steps:
+      - name: Set up environment
+        run: |
+          apt-get update -y
+          apt-get upgrade -y
+          apt-get install -y nodejs pkg-config
+      - uses: actions/checkout@v4
+      - name: Upload a candidate
+        env:
+          HACKAGE_PASSWORD: ${{ secrets.HACKAGE_PASSWORD }}
+        run: |
+          cabal sdist
+          cabal upload --username belka --password ${HACKAGE_PASSWORD}

CHANGELOG.md

@@ -6,6 +6,41 @@ The format is based on
 and this project adheres to
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## [1.3.0.0] - 2024-05-01
+### Changed
+- Remove deprecated `runCollectErrs`, `Resolution`, `CollectErrsT` from the
+  `Error` module.
+
+## [1.2.0.3] - 2024-01-09
+### Fixed
+- Fix corrupted source distribution.
+
+## [1.2.0.2] - 2024-01-09
+### Fixed
+- `gql` removes not only leading `\n` but also `\r`.
+- Fix non nullable type string representation in executor error messages.
+- Fix input objects not being coerced to lists.
+- Fix used variables are not found in the properties of input objects.
+
+## [1.2.0.1] - 2023-04-25
+### Fixed
+- Support hspec 2.11.
+
+## [1.2.0.0] - 2023-02-28
+### Added
+- Schema printing.
+- `Semigroup` and `Monoid` instances for `AST.Document.Description`.
+- Support for vector 0.13.0.0 and transformers 0.6.1.0.
+
+### Fixed
+- Fix resolvers returning a list in the reverse order.
+
+### Removed
+- GHC 8 support.
+- Cabal -json flag.
+- `Test.Hspec.GraphQL`: moved to `graphql-spice` package.
+- CPP `ifdef WITH_JSON` blocks.
+
 ## [1.1.0.0] - 2022-12-24
 ### Changed
 - Removed deprecated `Language.GraphQL.Error` functions: `addErr`, `addErrMsg`,
@@ -385,7 +420,6 @@ and this project adheres to
 - `Language.GraphQL.Schema`: `enum`, `enumA`, `wrappedEnum` and `wrappedEnumA`.
   Use `scalar`, `scalarA`, `wrappedScalar` and `wrappedScalarA` instead.
 
-
 ## [0.5.1.0] - 2019-10-22
 ### Deprecated
 - `Language.GraphQL.AST.Arguments`. Use `[Language.GraphQL.AST.Argument]`
@@ -490,23 +524,28 @@ and this project adheres to
 ### Added
 - Data types for the GraphQL language.
 
-[1.1.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v1.1.0.0&rev_to=v1.0.3.0
-[1.0.3.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v1.0.3.0&rev_to=v1.0.2.0
-[1.0.2.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v1.0.2.0&rev_to=v1.0.1.0
-[1.0.1.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v1.0.1.0&rev_to=v1.0.0.0
-[1.0.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v1.0.0.0&rev_to=v0.11.1.0
-[0.11.1.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.11.1.0&rev_to=v0.11.0.0
-[0.11.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.11.0.0&rev_to=v0.10.0.0
-[0.10.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.10.0.0&rev_to=v0.9.0.0
-[0.9.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.9.0.0&rev_to=v0.8.0.0
-[0.8.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.8.0.0&rev_to=v0.7.0.0
-[0.7.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.7.0.0&rev_to=v0.6.1.0
-[0.6.1.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.6.1.0&rev_to=v0.6.0.0
-[0.6.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.6.0.0&rev_to=v0.5.1.0
-[0.5.1.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.5.1.0&rev_to=v0.5.0.1
-[0.5.0.1]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.5.0.1&rev_to=v0.5.0.0
-[0.5.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.5.0.0&rev_to=v0.4.0.0
-[0.4.0.0]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.4.0.0&rev_to=v0.3
-[0.3]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.3&rev_to=v0.2.1
-[0.2.1]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.2.1&rev_to=v0.2
-[0.2]: https://www.caraus.tech/projects/pub-graphql/repository/23/diff?rev=v0.2&rev_to=v0.1
+[1.3.0.0]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.3...v1.3.0.0
+[1.2.0.3]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.2...v1.2.0.3
+[1.2.0.2]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.1...v1.2.0.2
+[1.2.0.1]: https://git.caraus.tech/OSS/graphql/compare/v1.2.0.0...v1.2.0.1
+[1.2.0.0]: https://git.caraus.tech/OSS/graphql/compare/v1.1.0.0...v1.2.0.0
+[1.1.0.0]: https://git.caraus.tech/OSS/graphql/compare/v1.0.3.0...v1.1.0.0
+[1.0.3.0]: https://git.caraus.tech/OSS/graphql/compare/v1.0.2.0...v1.0.3.0
+[1.0.2.0]: https://git.caraus.tech/OSS/graphql/compare/v1.0.1.0...v1.0.2.0
+[1.0.1.0]: https://git.caraus.tech/OSS/graphql/compare/v1.0.0.0...v1.0.1.0
+[1.0.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.11.1.0...v1.0.0.0
+[0.11.1.0]: https://git.caraus.tech/OSS/graphql/compare/v0.11.0.0...v0.11.1.0
+[0.11.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.10.0.0...v0.11.0.0
+[0.10.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.9.0.0...v0.10.0.0
+[0.9.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.8.0.0...v0.9.0.0
+[0.8.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.7.0.0...v0.8.0.0
+[0.7.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.6.1.0...v0.7.0.0
+[0.6.1.0]: https://git.caraus.tech/OSS/graphql/compare/v0.6.0.0...v0.6.1.0
+[0.6.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.5.1.0...v0.6.0.0
+[0.5.1.0]: https://git.caraus.tech/OSS/graphql/compare/v0.5.0.1...v0.5.1.0
+[0.5.0.1]: https://git.caraus.tech/OSS/graphql/compare/v0.5.0.0...v0.5.0.1
+[0.5.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.4.0.0...v0.5.0.0
+[0.4.0.0]: https://git.caraus.tech/OSS/graphql/compare/v0.3...v0.4.0.0
+[0.3]: https://git.caraus.tech/OSS/graphql/compare/v0.2.1...v0.3
+[0.2.1]: https://git.caraus.tech/OSS/graphql/compare/v0.2...v0.2.1
+[0.2]: https://git.caraus.tech/OSS/graphql/compare/v0.1...v0.2

README.md

@@ -1,15 +1,12 @@
 # GraphQL implementation in Haskell
 
-[![Simple Haskell](https://www.simplehaskell.org/badges/badge.svg)](https://www.simplehaskell.org)
-[![CI/CD](https://img.shields.io/badge/CI-CD-brightgreen)](https://build.caraus.tech/go/pipelines)
-
-See https://www.caraus.tech/projects/pub-graphql.
+See https://git.caraus.tech/OSS/graphql.
 
 Report issues on the
-[bug tracker](https://www.caraus.tech/projects/pub-graphql/issues).
+[bug tracker](https://git.caraus.tech/OSS/graphql/issues).
 
 API documentation is available through
 [Hackage](https://hackage.haskell.org/package/graphql).
 
 Further documentation will be made available in the
-[Wiki](https://www.caraus.tech/projects/pub-graphql/wiki).
+[Wiki](https://git.caraus.tech/OSS/graphql/wiki).

graphql.cabal

@@ -1,17 +1,17 @@
 cabal-version: 2.4
 
 name:           graphql
-version:        1.1.0.0
+version:        1.3.0.0
 synopsis:       Haskell GraphQL implementation
 description:    Haskell <https://spec.graphql.org/June2018/ GraphQL> implementation.
 category:       Language
-homepage:       https://www.caraus.tech/projects/pub-graphql
-bug-reports:    https://www.caraus.tech/projects/pub-graphql/issues
+homepage:       https://git.caraus.tech/OSS/graphql
+bug-reports:    https://git.caraus.tech/OSS/graphql/issues
 author:         Danny Navarro <j@dannynavarro.net>,
                 Matthías Páll Gissurarson <mpg@mpg.is>,
                 Sólrún Halla Einarsdóttir <she@mpg.is>
 maintainer:     belka@caraus.de
-copyright:      (c) 2019-2022 Eugen Wissner,
+copyright:      (c) 2019-2024 Eugen Wissner,
                 (c) 2015-2017 J. Daniel Navarro
 license:        MPL-2.0 AND BSD-3-Clause
 license-files:  LICENSE,
@@ -21,17 +21,12 @@ extra-source-files:
   CHANGELOG.md
   README.md
 tested-with:
-  GHC == 8.10.7,
-  GHC == 9.2.4
+  GHC == 9.4.7,
+  GHC == 9.6.3
 
 source-repository head
   type: git
-  location: git://caraus.tech/pub/graphql.git
-
-flag Json
-  description: Whether to build against @aeson 1.x@
-  default: False
-  manual: True
+  location: https://git.caraus.tech/OSS/graphql.git
 
 library
   exposed-modules:
@@ -53,7 +48,6 @@ library
     Language.GraphQL.Type.Schema
     Language.GraphQL.Validate
     Language.GraphQL.Validate.Validation
-    Test.Hspec.GraphQL
   other-modules:
     Language.GraphQL.Execute.Transform
     Language.GraphQL.Type.Definition
@@ -66,21 +60,15 @@ library
   build-depends:
     base >= 4.7 && < 5,
     conduit ^>= 1.3.4,
-    containers ^>= 0.6.2,
+    containers >= 0.6 && < 0.8,
     exceptions ^>= 0.10.4,
     megaparsec >= 9.0 && < 10,
     parser-combinators >= 1.3 && < 2,
     template-haskell >= 2.16 && < 3,
     text >= 1.2 && < 3,
-    transformers ^>= 0.5.6,
+    transformers >= 0.5.6 && < 0.7,
     unordered-containers ^>= 0.2.14,
-    vector ^>= 0.12.3
-  if flag(Json)
-    build-depends:
-      aeson >= 1.5.6 && < 1.6,
-      hspec-expectations >= 0.8.2 && < 0.9,
-      scientific >= 0.3.7 && < 0.4
-    cpp-options: -DWITH_JSON
+    vector >= 0.12 && < 0.14
 
   default-language: Haskell2010
 
@@ -105,12 +93,12 @@ test-suite graphql-test
   ghc-options: -threaded -rtsopts -with-rtsopts=-N -Wall
 
   build-depends:
-    QuickCheck ^>= 2.14.1,
+    QuickCheck >= 2.14 && < 2.16,
     base,
     conduit,
     exceptions,
     graphql,
-    hspec ^>= 2.9.1,
+    hspec >= 2.10.9 && < 2.12,
     hspec-expectations ^>= 0.8.2,
     hspec-megaparsec ^>= 2.2.0,
     megaparsec,
@@ -118,4 +106,6 @@ test-suite graphql-test
     unordered-containers,
     containers,
     vector
+  build-tool-depends:
+    hspec-discover:hspec-discover
   default-language: Haskell2010

src/Language/GraphQL.hs

@@ -1,105 +1,5 @@
-{-# LANGUAGE CPP #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
 
-#ifdef WITH_JSON
--- | This module provides the functions to parse and execute @GraphQL@ queries.
---
--- The content of this module depends on the value of the __json__ flag, which
--- is currently on by default. This behavior will change in the future, the flag
--- will be switched off by default and then removed.
---
--- This documentation is generated with the enabled __json__ flag and functions
--- described here support JSON and are deprecated. JSON instances are provided
--- now by an additional package, __graphql-spice__. To start using the new
--- package create __cabal.project__ in the root directory of your project with
--- the following contents:
---
--- @
--- packages: .
--- constraints: graphql -json
--- @
---
--- Then add __graphql-spice__ as dependency.
---
--- The new version of this module defines only one function, @graphql@, which
--- works with the internal GraphQL value representation used by this lbirary.
--- Refer to @Language.GraphQL.JSON.graphql@ in __graphql-spice__ for the
--- function that accepts and returns JSON.
-module Language.GraphQL
-    ( graphql
-    , graphqlSubs
-    ) where
-
-import Control.Monad.Catch (MonadCatch)
-import qualified Data.Aeson as Aeson
-import qualified Data.Aeson.Types as Aeson
-import qualified Data.HashMap.Strict as HashMap
-import Data.Maybe (catMaybes)
-import qualified Data.Sequence as Seq
-import Data.Text (Text)
-import Language.GraphQL.AST
-import Language.GraphQL.Error
-import Language.GraphQL.Execute
-import qualified Language.GraphQL.Validate as Validate
-import Language.GraphQL.Type.Schema (Schema)
-import Text.Megaparsec (parse)
-
-{-# DEPRECATED graphql "Use graphql-spice package instead" #-}
--- | If the text parses correctly as a @GraphQL@ query the query is
--- executed using the given 'Schema'.
-graphql :: MonadCatch m
-    => Schema m -- ^ Resolvers.
-    -> Text -- ^ Text representing a @GraphQL@ request document.
-    -> m (Either (ResponseEventStream m Aeson.Value) Aeson.Object) -- ^ Response.
-graphql schema = graphqlSubs schema mempty mempty
-
-{-# DEPRECATED graphqlSubs "Use graphql-spice package instead" #-}
--- | If the text parses correctly as a @GraphQL@ query the substitution is
--- applied to the query and the query is then executed using to the given
--- 'Schema'.
-graphqlSubs :: MonadCatch m
-    => Schema m -- ^ Resolvers.
-    -> Maybe Text -- ^ Operation name.
-    -> Aeson.Object -- ^ Variable substitution function.
-    -> Text -- ^ Text representing a @GraphQL@ request document.
-    -> m (Either (ResponseEventStream m Aeson.Value) Aeson.Object) -- ^ Response.
-graphqlSubs schema operationName variableValues document' =
-    case parse document "" document' of
-        Left errorBundle -> pure . formatResponse <$> parseError errorBundle
-        Right parsed ->
-            case validate parsed of
-                Seq.Empty -> fmap formatResponse
-                    <$> execute schema operationName variableValues parsed
-                errors -> pure $ pure
-                    $ HashMap.singleton "errors"
-                    $ Aeson.toJSON
-                    $ fromValidationError <$> errors
-  where
-    validate = Validate.document schema Validate.specifiedRules
-    formatResponse (Response data'' Seq.Empty) = HashMap.singleton "data" data''
-    formatResponse (Response data'' errors') = HashMap.fromList
-        [ ("data", data'')
-        , ("errors", Aeson.toJSON $ fromError <$> errors')
-        ]
-    fromError Error{..} = Aeson.object $ catMaybes
-        [ Just ("message", Aeson.toJSON message)
-        , toMaybe fromLocation "locations" locations
-        , toMaybe fromPath "path" path
-        ]
-    fromValidationError Validate.Error{..} = Aeson.object
-        [ ("message", Aeson.toJSON message)
-        , ("locations", Aeson.listValue fromLocation locations)
-        ]
-    toMaybe _ _ [] = Nothing
-    toMaybe f key xs = Just (key, Aeson.listValue f xs)
-    fromPath (Segment segment) = Aeson.String segment
-    fromPath (Index index) = Aeson.toJSON index
-    fromLocation Location{..} = Aeson.object
-        [ ("line", Aeson.toJSON line)
-        , ("column", Aeson.toJSON column)
-        ]
-#else
 -- | This module provides the functions to parse and execute @GraphQL@ queries.
 module Language.GraphQL
     ( graphql
@@ -144,4 +44,3 @@ graphql schema operationName variableValues document' =
         , locations = locations
         , path = []
         }
-#endif

src/Language/GraphQL/AST/Document.hs

@@ -371,8 +371,8 @@ data NonNullType
     deriving Eq
 
 instance Show NonNullType where
-    show (NonNullTypeNamed typeName) = '!' : Text.unpack typeName
-    show (NonNullTypeList listType) =  concat ["![", show listType, "]"]
+    show (NonNullTypeNamed typeName) = Text.unpack $ typeName <> "!"
+    show (NonNullTypeList listType) = concat ["[", show listType, "]!"]
 
 -- ** Directives
 
@@ -464,6 +464,14 @@ data SchemaExtension
 newtype Description = Description (Maybe Text)
     deriving (Eq, Show)
 
+instance Semigroup Description
+  where
+    Description lhs <> Description rhs = Description $ lhs <> rhs
+
+instance Monoid Description
+  where
+    mempty = Description mempty
+
 -- ** Types
 
 -- | Type definitions describe various user-defined types.

src/Language/GraphQL/AST/Encoder.hs

@@ -14,10 +14,11 @@ module Language.GraphQL.AST.Encoder
     , operationType
     , pretty
     , type'
+    , typeSystemDefinition
     , value
     ) where
 
-import Data.Foldable (fold)
+import Data.Foldable (fold, Foldable (..))
 import qualified Data.List.NonEmpty as NonEmpty
 import Data.Text (Text)
 import qualified Data.Text as Text
@@ -28,6 +29,7 @@ import qualified Data.Text.Lazy.Builder as Builder
 import Data.Text.Lazy.Builder.Int (decimal)
 import Data.Text.Lazy.Builder.RealFloat (realFloat)
 import qualified Language.GraphQL.AST.Document as Full
+import qualified Language.GraphQL.AST.DirectiveLocation as DirectiveLocation
 
 -- | Instructs the encoder whether the GraphQL document should be minified or
 --   pretty printed.
@@ -54,7 +56,246 @@ document formatter defs
     encodeDocument = foldr executableDefinition [] defs
     executableDefinition (Full.ExecutableDefinition executableDefinition') acc =
         definition formatter executableDefinition' : acc
-    executableDefinition _ acc = acc
+    executableDefinition (Full.TypeSystemDefinition typeSystemDefinition' _location) acc =
+        typeSystemDefinition formatter typeSystemDefinition' : acc
+    executableDefinition (Full.TypeSystemExtension typeSystemExtension' _location) acc =
+        typeSystemExtension formatter typeSystemExtension' : acc
+
+directiveLocation :: DirectiveLocation.DirectiveLocation -> Lazy.Text
+directiveLocation = Lazy.Text.pack . show
+
+withLineBreak :: Formatter -> Lazy.Text.Text -> Lazy.Text.Text
+withLineBreak formatter encodeDefinition
+    | Pretty _ <- formatter = Lazy.Text.snoc encodeDefinition '\n'
+    | Minified <- formatter = encodeDefinition
+
+typeSystemExtension :: Formatter -> Full.TypeSystemExtension -> Lazy.Text
+typeSystemExtension formatter = \case
+    Full.SchemaExtension schemaExtension' ->
+        schemaExtension formatter schemaExtension'
+    Full.TypeExtension typeExtension' -> typeExtension formatter typeExtension'
+
+schemaExtension :: Formatter -> Full.SchemaExtension -> Lazy.Text
+schemaExtension formatter = \case
+    Full.SchemaOperationExtension operationDirectives operationTypeDefinitions' ->
+        withLineBreak formatter
+            $ "extend schema "
+            <> optempty (directives formatter) operationDirectives
+            <> bracesList formatter (operationTypeDefinition formatter) (NonEmpty.toList operationTypeDefinitions')
+    Full.SchemaDirectivesExtension operationDirectives -> "extend schema "
+        <> optempty (directives formatter) (NonEmpty.toList operationDirectives)
+
+typeExtension :: Formatter -> Full.TypeExtension -> Lazy.Text
+typeExtension formatter = \case
+    Full.ScalarTypeExtension name' directives'
+        -> "extend scalar "
+        <> Lazy.Text.fromStrict name'
+        <> directives formatter (NonEmpty.toList directives')
+    Full.ObjectTypeFieldsDefinitionExtension name' ifaces' directives' fields'
+        -> "extend type "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (" " <>) (implementsInterfaces ifaces')
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (fieldDefinition nextFormatter) (NonEmpty.toList fields')
+    Full.ObjectTypeDirectivesExtension name' ifaces' directives'
+        -> "extend type "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (" " <>) (implementsInterfaces ifaces')
+        <> optempty (directives formatter) (NonEmpty.toList directives')
+    Full.ObjectTypeImplementsInterfacesExtension name' ifaces'
+        -> "extend type "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (" " <>) (implementsInterfaces ifaces')
+    Full.InterfaceTypeFieldsDefinitionExtension name' directives' fields'
+        -> "extend interface "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (fieldDefinition nextFormatter) (NonEmpty.toList fields')
+    Full.InterfaceTypeDirectivesExtension name' directives'
+        -> "extend interface "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) (NonEmpty.toList directives')
+    Full.UnionTypeUnionMemberTypesExtension name' directives' members'
+        -> "extend union "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> unionMemberTypes formatter members'
+    Full.UnionTypeDirectivesExtension name' directives'
+        -> "extend union "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) (NonEmpty.toList directives')
+    Full.EnumTypeEnumValuesDefinitionExtension name' directives' members'
+        -> "extend enum "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (enumValueDefinition formatter) (NonEmpty.toList members')
+    Full.EnumTypeDirectivesExtension name' directives'
+        -> "extend enum "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) (NonEmpty.toList directives')
+    Full.InputObjectTypeInputFieldsDefinitionExtension name' directives' fields'
+        -> "extend input "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (inputValueDefinition nextFormatter) (NonEmpty.toList fields')
+    Full.InputObjectTypeDirectivesExtension name' directives'
+        -> "extend input "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) (NonEmpty.toList directives')
+  where
+    nextFormatter = incrementIndent formatter
+
+-- | Converts a t'Full.TypeSystemDefinition' into a string.
+typeSystemDefinition :: Formatter -> Full.TypeSystemDefinition -> Lazy.Text
+typeSystemDefinition formatter = \case
+    Full.SchemaDefinition operationDirectives operationTypeDefinitions' ->
+        withLineBreak formatter
+            $ "schema "
+            <> optempty (directives formatter) operationDirectives
+            <> bracesList formatter (operationTypeDefinition formatter) (NonEmpty.toList operationTypeDefinitions')
+    Full.TypeDefinition typeDefinition' -> typeDefinition formatter typeDefinition'
+    Full.DirectiveDefinition description' name' arguments' locations
+        -> description formatter description'
+        <> "@"
+        <> Lazy.Text.fromStrict name'
+        <> argumentsDefinition formatter arguments'
+        <> " on"
+        <> pipeList formatter (directiveLocation <$> locations)
+
+operationTypeDefinition :: Formatter -> Full.OperationTypeDefinition -> Lazy.Text.Text
+operationTypeDefinition formatter (Full.OperationTypeDefinition operationType' namedType')
+    = indentLine (incrementIndent formatter)
+    <> operationType formatter operationType'
+    <> colon formatter
+    <> Lazy.Text.fromStrict namedType'
+
+fieldDefinition :: Formatter -> Full.FieldDefinition -> Lazy.Text.Text
+fieldDefinition formatter fieldDefinition' =
+    let Full.FieldDefinition description' name' arguments' type'' directives' = fieldDefinition'
+     in optempty (description formatter) description'
+            <> indentLine formatter
+            <> Lazy.Text.fromStrict name'
+            <> argumentsDefinition formatter arguments'
+            <> colon formatter
+            <> type' type''
+            <> optempty (directives formatter) directives'
+
+argumentsDefinition :: Formatter -> Full.ArgumentsDefinition -> Lazy.Text.Text
+argumentsDefinition formatter (Full.ArgumentsDefinition arguments') =
+    parensCommas formatter (argumentDefinition formatter) arguments'
+
+argumentDefinition :: Formatter -> Full.InputValueDefinition -> Lazy.Text.Text
+argumentDefinition formatter definition' =
+    let Full.InputValueDefinition description' name' type'' defaultValue' directives' = definition'
+     in optempty (description formatter) description'
+            <> Lazy.Text.fromStrict name'
+            <> colon formatter
+            <> type' type''
+            <> maybe mempty (defaultValue formatter . Full.node) defaultValue'
+            <> directives formatter directives'
+
+inputValueDefinition :: Formatter -> Full.InputValueDefinition -> Lazy.Text.Text
+inputValueDefinition formatter definition' =
+    let Full.InputValueDefinition description' name' type'' defaultValue' directives' = definition'
+     in optempty (description formatter) description'
+            <> indentLine formatter
+            <> Lazy.Text.fromStrict name'
+            <> colon formatter
+            <> type' type''
+            <> maybe mempty (defaultValue formatter . Full.node) defaultValue'
+            <> directives formatter directives'
+
+typeDefinition :: Formatter -> Full.TypeDefinition -> Lazy.Text
+typeDefinition formatter = \case
+    Full.ScalarTypeDefinition description' name' directives'
+        -> optempty (description formatter) description'
+        <> "scalar "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+    Full.ObjectTypeDefinition description' name' ifaces' directives' fields'
+        -> optempty (description formatter) description'
+        <> "type "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (" " <>) (implementsInterfaces ifaces')
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (fieldDefinition nextFormatter) fields'
+    Full.InterfaceTypeDefinition description' name' directives' fields'
+        -> optempty (description formatter) description'
+        <> "interface "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (fieldDefinition nextFormatter) fields'
+    Full.UnionTypeDefinition description' name' directives' members'
+        -> optempty (description formatter) description'
+        <> "union "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> unionMemberTypes formatter members'
+    Full.EnumTypeDefinition description' name' directives' members'
+        -> optempty (description formatter) description'
+        <> "enum "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (enumValueDefinition formatter) members'
+    Full.InputObjectTypeDefinition description' name' directives' fields'
+        -> optempty (description formatter) description'
+        <> "input "
+        <> Lazy.Text.fromStrict name'
+        <> optempty (directives formatter) directives'
+        <> eitherFormat formatter " " ""
+        <> bracesList formatter (inputValueDefinition nextFormatter) fields'
+  where
+    nextFormatter = incrementIndent formatter
+
+implementsInterfaces :: Foldable t => Full.ImplementsInterfaces t -> Lazy.Text
+implementsInterfaces (Full.ImplementsInterfaces interfaces)
+    | null interfaces = mempty
+    | otherwise = Lazy.Text.fromStrict
+        $ Text.append "implements "
+        $ Text.intercalate " & "
+        $ toList interfaces
+
+unionMemberTypes :: Foldable t => Formatter -> Full.UnionMemberTypes t -> Lazy.Text
+unionMemberTypes formatter (Full.UnionMemberTypes memberTypes)
+    | null memberTypes = mempty
+    | otherwise = Lazy.Text.append "="
+        $ pipeList formatter
+        $ Lazy.Text.fromStrict
+        <$> toList memberTypes
+
+pipeList :: Foldable t => Formatter -> t Lazy.Text -> Lazy.Text
+pipeList Minified =  (" " <>) . Lazy.Text.intercalate " | " . toList
+pipeList (Pretty _) =  Lazy.Text.concat
+    . fmap (("\n" <> indentSymbol <> "| ") <>)
+    . toList 
+
+enumValueDefinition :: Formatter -> Full.EnumValueDefinition -> Lazy.Text
+enumValueDefinition (Pretty _) enumValue =
+    let Full.EnumValueDefinition description' name' directives' = enumValue
+        formatter = Pretty 1
+     in description formatter description'
+        <> indentLine formatter
+        <> Lazy.Text.fromStrict name'
+        <> directives formatter directives'
+enumValueDefinition Minified enumValue =
+    let Full.EnumValueDefinition description' name' directives' = enumValue
+     in description Minified description'
+        <> Lazy.Text.fromStrict name'
+        <> directives Minified directives'
+
+description :: Formatter -> Full.Description -> Lazy.Text.Text
+description _formatter (Full.Description Nothing) = ""
+description formatter (Full.Description (Just description')) =
+    stringValue formatter description'
 
 -- | Converts a t'Full.ExecutableDefinition' into a string.
 definition :: Formatter -> Full.ExecutableDefinition -> Lazy.Text
@@ -100,7 +341,7 @@ variableDefinition formatter variableDefinition' =
     let Full.VariableDefinition variableName variableType defaultValue' _ =
             variableDefinition'
      in variable variableName
-    <> eitherFormat formatter ": " ":"
+    <> colon formatter
     <> type' variableType
     <> maybe mempty (defaultValue formatter . Full.node) defaultValue'
 
@@ -127,20 +368,26 @@ indent :: (Integral a) => a -> Lazy.Text
 indent indentation = Lazy.Text.replicate (fromIntegral indentation) indentSymbol
 
 selection :: Formatter -> Full.Selection -> Lazy.Text
-selection formatter = Lazy.Text.append indent' . encodeSelection
+selection formatter = Lazy.Text.append (indentLine formatter')
+    . encodeSelection
   where
     encodeSelection (Full.FieldSelection fieldSelection) =
-        field incrementIndent fieldSelection
+        field formatter' fieldSelection
     encodeSelection (Full.InlineFragmentSelection fragmentSelection) =
-        inlineFragment incrementIndent fragmentSelection
+        inlineFragment formatter' fragmentSelection
     encodeSelection (Full.FragmentSpreadSelection fragmentSelection) =
-        fragmentSpread incrementIndent fragmentSelection
-    incrementIndent
-        | Pretty indentation <- formatter = Pretty $ indentation + 1
-        | otherwise = Minified
-    indent'
-        | Pretty indentation <- formatter = indent $ indentation + 1
-        | otherwise = ""
+        fragmentSpread formatter' fragmentSelection
+    formatter' = incrementIndent formatter
+
+indentLine :: Formatter -> Lazy.Text
+indentLine formatter
+    | Pretty indentation <- formatter = indent indentation
+    | otherwise = ""
+
+incrementIndent :: Formatter -> Formatter
+incrementIndent formatter
+    | Pretty indentation <- formatter = Pretty $ indentation + 1
+    | otherwise = Minified
 
 colon :: Formatter -> Lazy.Text
 colon formatter = eitherFormat formatter ": " ":"
@@ -198,8 +445,10 @@ directive formatter (Full.Directive name args _)
     = "@" <> Lazy.Text.fromStrict name <> optempty (arguments formatter) args
 
 directives :: Formatter -> [Full.Directive] -> Lazy.Text
-directives Minified = spaces (directive Minified)
-directives formatter = Lazy.Text.cons ' ' . spaces (directive formatter)
+directives Minified values = spaces (directive Minified) values
+directives formatter values
+    | null values = ""
+    | otherwise = Lazy.Text.cons ' ' $ spaces (directive formatter) values
 
 -- | Converts a 'Full.Value' into a string.
 value :: Formatter -> Full.Value -> Lazy.Text

src/Language/GraphQL/Error.hs

@@ -8,28 +8,22 @@
 
 -- | Error handling.
 module Language.GraphQL.Error
-    ( CollectErrsT
-    , Error(..)
+    ( Error(..)
     , Path(..)
-    , Resolution(..)
     , ResolverException(..)
     , Response(..)
     , ResponseEventStream
     , parseError
-    , runCollectErrs
     ) where
 
 import Conduit
 import Control.Exception (Exception(..))
-import Control.Monad.Trans.State (StateT, runStateT)
-import Data.HashMap.Strict (HashMap)
 import Data.Sequence (Seq(..), (|>))
 import qualified Data.Sequence as Seq
 import Data.Text (Text)
 import qualified Data.Text as Text
-import Language.GraphQL.AST (Location(..), Name)
+import Language.GraphQL.AST (Location(..))
 import Language.GraphQL.Execute.Coerce
-import qualified Language.GraphQL.Type.Schema as Schema
 import Prelude hiding (null)
 import Text.Megaparsec
     ( ParseErrorBundle(..)
@@ -97,28 +91,3 @@ instance Show ResolverException where
     show (ResolverException e) = show e
 
 instance Exception ResolverException
-
--- * Deprecated
-
-{-# DEPRECATED runCollectErrs "runCollectErrs was part of the old executor and isn't used anymore" #-}
--- | Runs the given query computation, but collects the errors into an error
--- list, which is then sent back with the data.
-runCollectErrs :: (Monad m, Serialize a)
-    => HashMap Name (Schema.Type m)
-    -> CollectErrsT m a
-    -> m (Response a)
-runCollectErrs types' res = do
-    (dat, Resolution{..}) <- runStateT res
-        $ Resolution{ errors = Seq.empty, types = types' }
-    pure $ Response dat errors
-
-{-# DEPRECATED Resolution "Resolution was part of the old executor and isn't used anymore" #-}
--- | Executor context.
-data Resolution m = Resolution
-    { errors :: Seq Error
-    , types :: HashMap Name (Schema.Type m)
-    }
-
-{-# DEPRECATED CollectErrsT "CollectErrsT was part of the old executor and isn't used anymore" #-}
--- | A wrapper to pass error messages around.
-type CollectErrsT m = StateT (Resolution m) m

src/Language/GraphQL/Execute.hs

@@ -39,6 +39,7 @@ import qualified Data.List.NonEmpty as NonEmpty
 import Data.Maybe (fromMaybe)
 import Data.Sequence (Seq)
 import qualified Data.Sequence as Seq
+import qualified Data.Vector as Vector
 import Data.Text (Text)
 import qualified Data.Text as Text
 import Data.Typeable (cast)
@@ -466,12 +467,12 @@ completeValue :: (MonadCatch m, Serialize a)
 completeValue (Out.isNonNullType -> False) _ _ Type.Null =
     pure null
 completeValue outputType@(Out.ListBaseType listType) fields errorPath (Type.List list)
-    = foldM go (0, []) list >>= coerceResult outputType . List . snd
+    = foldM go Vector.empty list >>= coerceResult outputType . List . Vector.toList
   where
-    go (index, accumulator) listItem = do
-        let updatedPath = Index index : errorPath
-        completedValue <- completeValue listType fields updatedPath listItem
-        pure (index + 1, completedValue : accumulator)
+    go accumulator listItem =
+        let updatedPath = Index (Vector.length accumulator) : errorPath
+         in Vector.snoc accumulator
+            <$> completeValue listType fields updatedPath listItem
 completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Int int) =
     coerceResult outputType $ Int int
 completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Boolean boolean) =
@@ -555,33 +556,24 @@ coerceArgumentValues argumentDefinitions argumentValues =
                     $ Just inputValue
                 | otherwise -> throwM
                     $ InputCoercionException (Text.unpack argumentName) variableType Nothing
+
     matchFieldValues' = matchFieldValues coerceArgumentValue
         $ Full.node <$> argumentValues
-    coerceArgumentValue inputType (Transform.Int integer) =
-        coerceInputLiteral inputType (Type.Int integer)
-    coerceArgumentValue inputType (Transform.Boolean boolean) =
-        coerceInputLiteral inputType (Type.Boolean boolean)
-    coerceArgumentValue inputType (Transform.String string) =
-        coerceInputLiteral inputType (Type.String string)
-    coerceArgumentValue inputType (Transform.Float float) =
-        coerceInputLiteral inputType (Type.Float float)
-    coerceArgumentValue inputType (Transform.Enum enum) =
-        coerceInputLiteral inputType (Type.Enum enum)
-    coerceArgumentValue inputType Transform.Null
-        | In.isNonNullType inputType = Nothing
-        | otherwise = coerceInputLiteral inputType Type.Null
-    coerceArgumentValue (In.ListBaseType inputType) (Transform.List list) =
-        let coerceItem = coerceArgumentValue inputType
-         in Type.List <$> traverse coerceItem list
-    coerceArgumentValue (In.InputObjectBaseType inputType) (Transform.Object object)
-        | In.InputObjectType _ _ inputFields <- inputType = 
-            let go = forEachField object
-                resultMap = HashMap.foldrWithKey go (pure mempty) inputFields
-             in Type.Object <$> resultMap
-    coerceArgumentValue _ (Transform.Variable variable) = pure variable
-    coerceArgumentValue _ _ = Nothing
-    forEachField object variableName (In.InputField _ variableType defaultValue) =
-        matchFieldValues coerceArgumentValue object variableName variableType defaultValue
+
+    coerceArgumentValue inputType transform =
+      coerceInputLiteral inputType $ extractArgumentValue transform
+
+    extractArgumentValue (Transform.Int integer) = Type.Int integer
+    extractArgumentValue (Transform.Boolean boolean) = Type.Boolean boolean
+    extractArgumentValue (Transform.String string) = Type.String string
+    extractArgumentValue (Transform.Float float) = Type.Float float
+    extractArgumentValue (Transform.Enum enum) = Type.Enum enum
+    extractArgumentValue Transform.Null = Type.Null
+    extractArgumentValue (Transform.List list) =
+      Type.List $ extractArgumentValue <$> list
+    extractArgumentValue (Transform.Object object) =
+      Type.Object $ extractArgumentValue <$> object
+    extractArgumentValue (Transform.Variable variable) = variable
 
 collectFields :: Monad m
     => Out.ObjectType m

src/Language/GraphQL/Execute/Coerce.hs

@@ -5,14 +5,8 @@
 {-# LANGUAGE ExplicitForAll #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ViewPatterns #-}
-{-# LANGUAGE CPP #-}
 
 -- | Types and functions used for input and result coercion.
---
--- JSON instances in this module are only available with the __json__
--- flag that is currently on by default, but will be disabled in the future.
--- Refer to the documentation in the 'Language.GraphQL' module and to
--- the __graphql-spice__ package.
 module Language.GraphQL.Execute.Coerce
     ( Output(..)
     , Serialize(..)
@@ -21,10 +15,6 @@ module Language.GraphQL.Execute.Coerce
     , matchFieldValues
     ) where
 
-#ifdef WITH_JSON
-import qualified Data.Aeson as Aeson
-import Data.Scientific (toBoundedInteger, toRealFloat)
-#endif
 import Data.Int (Int32)
 import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HashMap
@@ -232,69 +222,3 @@ instance Serialize Type.Value where
         $ HashMap.fromList
         $ OrderedMap.toList object
     serialize _ _ = Nothing
-
-#ifdef WITH_JSON
-instance Serialize Aeson.Value where
-    serialize (Out.ScalarBaseType scalarType) value
-        | Type.ScalarType "Int" _ <- scalarType
-        , Int int <- value = Just $ Aeson.toJSON int
-        | Type.ScalarType "Float" _ <- scalarType
-        , Float float <- value = Just $ Aeson.toJSON float
-        | Type.ScalarType "String" _ <- scalarType
-        , String string <- value = Just $ Aeson.String string
-        | Type.ScalarType "ID" _ <- scalarType
-        , String string <- value = Just $ Aeson.String string
-        | Type.ScalarType "Boolean" _ <- scalarType
-        , Boolean boolean <- value = Just $ Aeson.Bool boolean
-    serialize _ (Enum enum) = Just $ Aeson.String enum
-    serialize _ (List list) = Just $ Aeson.toJSON list
-    serialize _ (Object object) = Just
-        $ Aeson.object
-        $ OrderedMap.toList
-        $ Aeson.toJSON <$> object
-    serialize _ _ = Nothing
-    null = Aeson.Null
-
-instance VariableValue Aeson.Value where
-    coerceVariableValue _ Aeson.Null = Just Type.Null
-    coerceVariableValue (In.ScalarBaseType scalarType) value
-        | (Aeson.String stringValue) <- value = Just $ Type.String stringValue
-        | (Aeson.Bool booleanValue) <- value = Just $ Type.Boolean booleanValue
-        | (Aeson.Number numberValue) <- value
-        , (Type.ScalarType "Float" _) <- scalarType =
-            Just $ Type.Float $ toRealFloat numberValue
-        | (Aeson.Number numberValue) <- value = -- ID or Int
-            Type.Int <$> toBoundedInteger numberValue
-    coerceVariableValue (In.EnumBaseType _) (Aeson.String stringValue) =
-        Just $ Type.Enum stringValue
-    coerceVariableValue (In.InputObjectBaseType objectType) value
-        | (Aeson.Object objectValue) <- value = do
-            let (In.InputObjectType _ _ inputFields) = objectType
-            (newObjectValue, resultMap) <- foldWithKey objectValue inputFields
-            if HashMap.null newObjectValue
-                then Just $ Type.Object resultMap
-                else Nothing
-      where
-        foldWithKey objectValue = HashMap.foldrWithKey matchFieldValues'
-            $ Just (objectValue, HashMap.empty)
-        matchFieldValues' _ _ Nothing = Nothing
-        matchFieldValues' fieldName inputField (Just (objectValue, resultMap)) =
-            let (In.InputField _ fieldType _) = inputField
-                insert = flip (HashMap.insert fieldName) resultMap
-                newObjectValue = HashMap.delete fieldName objectValue
-             in case HashMap.lookup fieldName objectValue of
-                    Just variableValue -> do
-                        coerced <- coerceVariableValue fieldType variableValue
-                        pure (newObjectValue, insert coerced)
-                    Nothing -> Just (objectValue, resultMap)
-    coerceVariableValue (In.ListBaseType listType) value
-        | (Aeson.Array arrayValue) <- value =
-            Type.List <$> foldr foldVector (Just []) arrayValue
-        | otherwise = coerceVariableValue listType value
-      where
-        foldVector _ Nothing = Nothing
-        foldVector variableValue (Just list) = do
-            coerced <- coerceVariableValue listType variableValue
-            pure $ coerced : list 
-    coerceVariableValue _ _ = Nothing
-#endif

src/Language/GraphQL/TH.hs

@@ -21,7 +21,7 @@ stripIndentation code = reverse
     indent count (' ' : xs) = indent (count - 1) xs
     indent _ xs = xs
     withoutLeadingNewlines = dropNewlines code
-    dropNewlines = dropWhile (== '\n')
+    dropNewlines = dropWhile $ flip any ['\n', '\r'] . (==)
     spaces = length $ takeWhile (== ' ') withoutLeadingNewlines
 
 -- | Removes leading and trailing newlines. Indentation of the first line is

src/Language/GraphQL/Type/Definition.hs

@@ -18,6 +18,8 @@ module Language.GraphQL.Type.Definition
     , float
     , id
     , int
+    , showNonNullType
+    , showNonNullListType
     , selection
     , string
     ) where
@@ -207,3 +209,11 @@ include = handle include'
             (Just (Boolean True)) -> Include directive'
             _ -> Skip
     include' directive' = Continue directive'
+
+showNonNullType :: Show a => a -> String
+showNonNullType = (++ "!") . show
+
+showNonNullListType :: Show a => a -> String
+showNonNullListType listType =
+    let representation = show listType
+     in concat ["[", representation, "]!"]

src/Language/GraphQL/Type/In.hs

@@ -66,10 +66,11 @@ instance Show Type where
     show (NamedEnumType enumType) = show enumType
     show (NamedInputObjectType inputObjectType) = show inputObjectType
     show (ListType baseType) = concat ["[", show baseType, "]"]
-    show (NonNullScalarType scalarType) = '!' : show scalarType
-    show (NonNullEnumType enumType) = '!' : show enumType
-    show (NonNullInputObjectType inputObjectType) = '!' : show inputObjectType
-    show (NonNullListType baseType) = concat ["![", show baseType, "]"]
+    show (NonNullScalarType scalarType) = Definition.showNonNullType scalarType
+    show (NonNullEnumType enumType) = Definition.showNonNullType enumType
+    show (NonNullInputObjectType inputObjectType) =
+        Definition.showNonNullType inputObjectType
+    show (NonNullListType baseType) = Definition.showNonNullListType baseType
 
 -- | Field argument definition.
 data Argument = Argument (Maybe Text) Type (Maybe Definition.Value)

src/Language/GraphQL/Type/Out.hs

@@ -115,12 +115,12 @@ instance forall a. Show (Type a) where
     show (NamedInterfaceType interfaceType) = show interfaceType
     show (NamedUnionType unionType) = show unionType
     show (ListType baseType) = concat ["[", show baseType, "]"]
-    show (NonNullScalarType scalarType) = '!' : show scalarType
-    show (NonNullEnumType enumType) = '!' : show enumType
-    show (NonNullObjectType inputObjectType) = '!' : show inputObjectType
-    show (NonNullInterfaceType interfaceType) = '!' : show interfaceType
-    show (NonNullUnionType unionType) = '!' : show unionType
-    show (NonNullListType baseType) = concat ["![", show baseType, "]"]
+    show (NonNullScalarType scalarType) = showNonNullType scalarType
+    show (NonNullEnumType enumType) = showNonNullType enumType
+    show (NonNullObjectType inputObjectType) = showNonNullType inputObjectType
+    show (NonNullInterfaceType interfaceType) = showNonNullType interfaceType
+    show (NonNullUnionType unionType) = showNonNullType unionType
+    show (NonNullListType baseType) = showNonNullListType baseType
 
 -- | Matches either 'NamedScalarType' or 'NonNullScalarType'.
 pattern ScalarBaseType :: forall m. ScalarType -> Type m

src/Language/GraphQL/Validate/Rules.hs

@@ -2,11 +2,13 @@
    v. 2.0. If a copy of the MPL was not distributed with this file, You can
    obtain one at https://mozilla.org/MPL/2.0/. -}
 
+{-# LANGUAGE DataKinds #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE ViewPatterns #-}
 
 -- | This module contains default rules defined in the GraphQL specification.
@@ -61,6 +63,7 @@ import Data.Sequence (Seq(..), (|>))
 import qualified Data.Sequence as Seq
 import Data.Text (Text)
 import qualified Data.Text as Text
+import GHC.Records (HasField(..))
 import qualified Language.GraphQL.AST.Document as Full
 import qualified Language.GraphQL.Type.Definition as Definition
 import qualified Language.GraphQL.Type.Internal as Type
@@ -618,6 +621,10 @@ noUndefinedVariablesRule =
         , "\"."
         ]
 
+-- Used to find the difference between defined and used variables. The first
+-- argument are variables defined in the operation, the second argument are
+-- variables used in the query. It should return the difference between these
+-- 2 sets.
 type UsageDifference
     = HashMap Full.Name [Full.Location]
     -> HashMap Full.Name [Full.Location]
@@ -664,11 +671,17 @@ variableUsageDifference difference errorMessage = OperationDefinitionRule $ \cas
         = filterSelections' selections
         >>= lift . mapReaderT (<> mapDirectives directives') . pure
     findDirectiveVariables (Full.Directive _ arguments _) = mapArguments arguments
-    mapArguments = Seq.fromList . mapMaybe findArgumentVariables
+    mapArguments = Seq.fromList . (>>= findArgumentVariables)
     mapDirectives = foldMap findDirectiveVariables
-    findArgumentVariables (Full.Argument _ Full.Node{ node = Full.Variable value', ..} _) =
-        Just (value', [location])
-    findArgumentVariables _ = Nothing
+
+    findArgumentVariables (Full.Argument _ value _) = findNodeVariables value
+    findNodeVariables Full.Node{ node = value, ..} = findValueVariables location value
+
+    findValueVariables location (Full.Variable value') = [(value', [location])]
+    findValueVariables _ (Full.List values) = values >>= findNodeVariables
+    findValueVariables _ (Full.Object fields) = fields
+        >>= findNodeVariables . getField @"value"
+    findValueVariables _ _ = []
     makeError operationName (variableName, locations') = Error
         { message = errorMessage operationName variableName
         , locations = locations'

src/Test/Hspec/GraphQL.hs

@@ -1,49 +0,0 @@
-{- This Source Code Form is subject to the terms of the Mozilla Public License,
-   v. 2.0. If a copy of the MPL was not distributed with this file, You can
-   obtain one at https://mozilla.org/MPL/2.0/. -}
-
-{-# LANGUAGE CPP #-}
-
-#ifdef WITH_JSON
-{-# LANGUAGE ExplicitForAll #-}
-{-# LANGUAGE OverloadedStrings #-}
-
--- | Test helpers.
-module Test.Hspec.GraphQL {-# DEPRECATED "Use graphql-spice package instead" #-}
-    ( shouldResolve
-    , shouldResolveTo
-    ) where
-
-import Control.Monad.Catch (MonadCatch)
-import qualified Data.Aeson as Aeson
-import qualified Data.HashMap.Strict as HashMap
-import Data.Text (Text)
-import Language.GraphQL.Error
-import Test.Hspec.Expectations (Expectation, expectationFailure, shouldBe, shouldNotSatisfy)
-
--- | Asserts that a query resolves to some value.
-shouldResolveTo :: MonadCatch m
-    => Either (ResponseEventStream m Aeson.Value) Aeson.Object
-    -> Aeson.Object
-    -> Expectation
-shouldResolveTo (Right actual) expected = actual `shouldBe` expected
-shouldResolveTo _ _ = expectationFailure
-    "the query is expected to resolve to a value, but it resolved to an event stream"
-
--- | Asserts that the response doesn't contain any errors.
-shouldResolve :: MonadCatch m
-    => (Text -> IO (Either (ResponseEventStream m Aeson.Value) Aeson.Object))
-    -> Text
-    -> Expectation
-shouldResolve executor query = do
-    actual <- executor query
-    case actual of
-        Right response ->
-            response `shouldNotSatisfy` HashMap.member "errors"
-        _ -> expectationFailure
-            "the query is expected to resolve to a value, but it resolved to an event stream"
-#else
-module Test.Hspec.GraphQL {-# DEPRECATED "Use graphql-spice package instead" #-}
-    (
-    ) where
-#endif

tests/Language/GraphQL/AST/Arbitrary.hs

@@ -7,6 +7,7 @@ import Test.QuickCheck.Arbitrary (Arbitrary (arbitrary))
 import Test.QuickCheck (oneof, elements, listOf, resize, NonEmptyList (..))
 import Test.QuickCheck.Gen (Gen (..))
 import Data.Text (Text, pack)
+import Data.Functor ((<&>))
 
 newtype AnyPrintableChar = AnyPrintableChar { getAnyPrintableChar :: Char } deriving (Eq, Show)
 
@@ -59,34 +60,36 @@ instance Arbitrary a => Arbitrary (AnyObjectField a) where
         location' <- getAnyLocation <$> arbitrary
         pure $ AnyObjectField $ Doc.ObjectField name' value' location'
 
-newtype AnyValue = AnyValue { getAnyValue :: Doc.Value } deriving (Eq, Show)
+newtype AnyValue = AnyValue { getAnyValue :: Doc.Value }
+    deriving (Eq, Show)
 
-instance Arbitrary AnyValue where
-    arbitrary = AnyValue <$> oneof
-        [ variableGen
-        , Doc.Int <$> arbitrary
-        , Doc.Float <$> arbitrary
-        , Doc.String <$> (getAnyPrintableText <$> arbitrary)
-        , Doc.Boolean <$> arbitrary
-        , MkGen $ \_ _ -> Doc.Null
-        , Doc.Enum <$> (getAnyName <$> arbitrary)
-        , Doc.List <$> listGen
-        , Doc.Object <$> objectGen
-        ]
-            where
-                variableGen :: Gen Doc.Value
-                variableGen = Doc.Variable <$> (getAnyName <$> arbitrary)
-                listGen :: Gen [Doc.Node Doc.Value]
-                listGen = (resize 5 . listOf) nodeGen
-                nodeGen = do
-                    node' <- getAnyNode <$> (arbitrary :: Gen (AnyNode AnyValue))
-                    pure (getAnyValue <$> node')
-                objectGen :: Gen [Doc.ObjectField Doc.Value]
-                objectGen = resize 1 $ do
-                    list <- getNonEmpty <$> (arbitrary :: Gen (NonEmptyList (AnyObjectField AnyValue)))
-                    pure $ map (fmap getAnyValue . getAnyObjectField) list
+instance Arbitrary AnyValue
+  where
+    arbitrary =
+        let variableGen :: Gen Doc.Value
+            variableGen = Doc.Variable . getAnyName <$> arbitrary
+            listGen :: Gen [Doc.Node Doc.Value]
+            listGen = (resize 5 . listOf) nodeGen
+            nodeGen :: Gen (Doc.Node Doc.Value)
+            nodeGen = fmap getAnyNode arbitrary <&> fmap getAnyValue
+            objectGen :: Gen [Doc.ObjectField Doc.Value]
+            objectGen = resize 1
+                $ fmap getNonEmpty arbitrary
+                <&> map (fmap getAnyValue . getAnyObjectField)
+         in AnyValue <$> oneof
+            [ variableGen
+            , Doc.Int <$> arbitrary
+            , Doc.Float <$> arbitrary
+            , Doc.String . getAnyPrintableText <$> arbitrary
+            , Doc.Boolean <$> arbitrary
+            , MkGen $ \_ _ -> Doc.Null
+            , Doc.Enum . getAnyName <$> arbitrary
+            , Doc.List <$> listGen
+            , Doc.Object <$> objectGen
+            ]
 
-newtype AnyArgument a = AnyArgument { getAnyArgument :: Doc.Argument } deriving (Eq, Show)
+newtype AnyArgument a = AnyArgument { getAnyArgument :: Doc.Argument }
+    deriving (Eq, Show)
 
 instance Arbitrary a => Arbitrary (AnyArgument a) where
     arbitrary = do

tests/Language/GraphQL/AST/DocumentSpec.hs

@@ -18,3 +18,9 @@ spec = do
                     ]
                 expected = "{ field1: 1.2, field2: null }"
              in show object `shouldBe` expected
+
+    describe "Description" $
+        it "keeps content when merging with no description" $
+            let expected = Description $ Just "Left description"
+                actual = expected <> Description Nothing
+             in actual `shouldBe` expected

tests/Language/GraphQL/AST/EncoderSpec.hs

@@ -4,6 +4,7 @@ module Language.GraphQL.AST.EncoderSpec
     ( spec
     ) where
 
+import Data.List.NonEmpty (NonEmpty(..))
 import qualified Language.GraphQL.AST.Document as Full
 import Language.GraphQL.AST.Encoder
 import Language.GraphQL.TH
@@ -178,3 +179,91 @@ spec = do
         it "produces lowercase mutation operation type" $
             let actual = operationType pretty Full.Mutation
              in actual `shouldBe` "mutation"
+
+    describe "typeSystemDefinition" $ do
+        it "produces a schema with an indented operation type definition" $
+            let queryType = Full.OperationTypeDefinition Full.Query "QueryRootType"
+                mutationType = Full.OperationTypeDefinition Full.Mutation "MutationType"
+                operations = queryType :| pure mutationType
+                definition' = Full.SchemaDefinition [] operations
+                expected = Text.Lazy.snoc [gql|
+                  schema {
+                    query: QueryRootType
+                    mutation: MutationType
+                  }
+                |] '\n'
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected
+
+        it "encodes a scalar type definition" $
+            let uuidType = Full.ScalarTypeDefinition mempty "UUID" mempty
+                definition' = Full.TypeDefinition uuidType
+                expected = "scalar UUID"
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected
+
+        it "encodes an interface definition" $
+            let someType = Full.TypeNamed "String"
+                argument = Full.InputValueDefinition mempty "arg" someType Nothing mempty
+                arguments = Full.ArgumentsDefinition [argument]
+                definition' = Full.TypeDefinition
+                    $ Full.InterfaceTypeDefinition mempty "UUID" mempty
+                    $ pure
+                    $ Full.FieldDefinition mempty "value" arguments someType mempty
+                expected = [gql|
+                  interface UUID {
+                    value(arg: String): String
+                  }
+                |]
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected
+
+        it "encodes an union definition" $
+            let definition' = Full.TypeDefinition
+                    $ Full.UnionTypeDefinition mempty "SearchResult" mempty
+                    $ Full.UnionMemberTypes ["Photo", "Person"]
+                expected = [gql|
+                  union SearchResult =
+                    | Photo
+                    | Person
+                |]
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected
+
+        it "encodes an enum definition" $
+            let values =
+                    [ Full.EnumValueDefinition mempty "NORTH" mempty
+                    , Full.EnumValueDefinition mempty "EAST" mempty
+                    , Full.EnumValueDefinition mempty "SOUTH" mempty
+                    , Full.EnumValueDefinition mempty "WEST" mempty
+                    ]
+                definition' = Full.TypeDefinition
+                    $ Full.EnumTypeDefinition mempty "Direction" mempty values
+                expected = [gql|
+                  enum Direction {
+                    NORTH
+                    EAST
+                    SOUTH
+                    WEST
+                  }
+                |]
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected
+
+        it "encodes an input type" $
+            let intType = Full.TypeNonNull $ Full.NonNullTypeNamed "Int"
+                stringType = Full.TypeNamed "String"
+                fields =
+                    [ Full.InputValueDefinition mempty "a" stringType Nothing mempty
+                    , Full.InputValueDefinition mempty "b" intType Nothing mempty
+                    ]
+                definition' = Full.TypeDefinition
+                    $ Full.InputObjectTypeDefinition mempty "ExampleInputObject" mempty fields
+                expected = [gql|
+                  input ExampleInputObject {
+                    a: String
+                    b: Int!
+                  }
+                |]
+                actual = typeSystemDefinition pretty definition'
+             in actual `shouldBe` expected

tests/Language/GraphQL/ExecuteSpec.hs

@@ -66,8 +66,10 @@ queryType :: Out.ObjectType IO
 queryType = Out.ObjectType "Query" Nothing []
     $ HashMap.fromList
     [ ("philosopher", ValueResolver philosopherField philosopherResolver)
-    , ("genres", ValueResolver genresField genresResolver)
+    , ("throwing", ValueResolver throwingField throwingResolver)
     , ("count", ValueResolver countField countResolver)
+    , ("sequence", ValueResolver sequenceField sequenceResolver)
+    , ("withInputObject", ValueResolver withInputObjectField withInputObjectResolver)
     ]
   where
     philosopherField =
@@ -75,15 +77,33 @@ queryType = Out.ObjectType "Query" Nothing []
         $ HashMap.singleton "id"
         $ In.Argument Nothing (In.NamedScalarType id) Nothing
     philosopherResolver = pure $ Object mempty
-    genresField =
+    throwingField =
         let fieldType = Out.ListType $ Out.NonNullScalarType string
          in Out.Field Nothing fieldType HashMap.empty
-    genresResolver :: Resolve IO
-    genresResolver = throwM PhilosopherException
+    throwingResolver :: Resolve IO
+    throwingResolver = throwM PhilosopherException
     countField =
         let fieldType = Out.NonNullScalarType int
          in Out.Field Nothing fieldType HashMap.empty
     countResolver = pure ""
+    sequenceField =
+        let fieldType = Out.ListType $ Out.NonNullScalarType int
+         in Out.Field Nothing fieldType HashMap.empty
+    sequenceResolver = pure intSequence
+    withInputObjectResolver = pure $ Type.Int 0
+    withInputObjectField =
+        Out.Field Nothing (Out.NonNullScalarType int) $ HashMap.fromList
+            [("values", In.Argument Nothing withInputObjectArgumentType Nothing)]
+    withInputObjectArgumentType = In.NonNullListType
+        $ In.NonNullInputObjectType inputObjectType
+
+inputObjectType :: In.InputObjectType
+inputObjectType = In.InputObjectType "InputObject" Nothing $
+    HashMap.singleton "name" $
+        In.InputField Nothing (In.NonNullScalarType int) Nothing
+
+intSequence :: Value
+intSequence = Type.List [Type.Int 1, Type.Int 2, Type.Int 3]
 
 musicType :: Out.ObjectType IO
 musicType = Out.ObjectType "Music" Nothing []
@@ -287,7 +307,7 @@ spec =
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
                         { message =
-                            "Value completion error. Expected type !School, found: EXISTENTIALISM."
+                            "Value completion error. Expected type School!, found: EXISTENTIALISM."
                         , locations = [Location 1 17]
                         , path = [Segment "philosopher", Segment "school"]
                         }
@@ -299,7 +319,7 @@ spec =
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
                         { message =
-                            "Value completion error. Expected type !Interest, found: { instrument: \"piano\" }."
+                            "Value completion error. Expected type Interest!, found: { instrument: \"piano\" }."
                         , locations = [Location 1 17]
                         , path = [Segment "philosopher", Segment "interest"]
                         }
@@ -311,7 +331,7 @@ spec =
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
                         { message
-                            = "Value completion error. Expected type !Work, found:\
+                            = "Value completion error. Expected type Work!, found:\
                             \ { title: \"Also sprach Zarathustra: Ein Buch f\252r Alle und Keinen\" }."
                         , locations = [Location 1 17]
                         , path = [Segment "philosopher", Segment "majorWork"]
@@ -320,22 +340,10 @@ spec =
                     sourceQuery = "{ philosopher { majorWork { title } } }"
                  in sourceQuery `shouldResolveTo` expected
 
-            it "gives location information for invalid scalar arguments" $
-                let data'' = Object $ HashMap.singleton "philosopher" Null
-                    executionErrors = pure $ Error
-                        { message =
-                            "Argument \"id\" has invalid type. Expected type ID, found: True."
-                        , locations = [Location 1 15]
-                        , path = [Segment "philosopher"]
-                        }
-                    expected = Response data'' executionErrors
-                    sourceQuery = "{ philosopher(id: true) { lastName } }"
-                 in sourceQuery `shouldResolveTo` expected
-
             it "gives location information for failed result coercion" $
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
-                        { message = "Unable to coerce result to !Int."
+                        { message = "Unable to coerce result to Int!."
                         , locations = [Location 1 26]
                         , path = [Segment "philosopher", Segment "century"]
                         }
@@ -344,19 +352,19 @@ spec =
                 in sourceQuery `shouldResolveTo` expected
 
             it "gives location information for failed result coercion" $
-                let data'' = Object $ HashMap.singleton "genres" Null
+                let data'' = Object $ HashMap.singleton "throwing" Null
                     executionErrors = pure $ Error
                         { message = "PhilosopherException"
                         , locations = [Location 1 3]
-                        , path = [Segment "genres"]
+                        , path = [Segment "throwing"]
                         }
                     expected = Response data'' executionErrors
-                    sourceQuery = "{ genres }"
+                    sourceQuery = "{ throwing }"
                 in sourceQuery `shouldResolveTo` expected
 
             it "sets data to null if a root field isn't nullable" $
                 let executionErrors = pure $ Error
-                        { message = "Unable to coerce result to !Int."
+                        { message = "Unable to coerce result to Int!."
                         , locations = [Location 1 3]
                         , path = [Segment "count"]
                         }
@@ -367,7 +375,7 @@ spec =
             it "detects nullability errors" $
                 let data'' = Object $ HashMap.singleton "philosopher" Null
                     executionErrors = pure $ Error
-                        { message = "Value completion error. Expected type !String, found: null."
+                        { message = "Value completion error. Expected type String!, found: null."
                         , locations = [Location 1 26]
                         , path = [Segment "philosopher", Segment "firstLanguage"]
                         }
@@ -375,6 +383,31 @@ spec =
                     sourceQuery = "{ philosopher(id: \"1\") { firstLanguage } }"
                 in sourceQuery `shouldResolveTo` expected
 
+            it "returns list elements in the original order" $
+                let data'' = Object $ HashMap.singleton "sequence" intSequence
+                    expected = Response data'' mempty
+                    sourceQuery = "{ sequence }"
+                in sourceQuery `shouldResolveTo` expected
+
+            context "Arguments" $ do
+                it "gives location information for invalid scalar arguments" $
+                    let data'' = Object $ HashMap.singleton "philosopher" Null
+                        executionErrors = pure $ Error
+                            { message =
+                                "Argument \"id\" has invalid type. Expected type ID, found: True."
+                            , locations = [Location 1 15]
+                            , path = [Segment "philosopher"]
+                            }
+                        expected = Response data'' executionErrors
+                        sourceQuery = "{ philosopher(id: true) { lastName } }"
+                    in sourceQuery `shouldResolveTo` expected
+
+                it "puts an object in a list if needed" $
+                    let data'' = Object $ HashMap.singleton "withInputObject" $ Type.Int 0
+                        expected = Response data'' mempty
+                        sourceQuery = "{ withInputObject(values: { name: 0 }) }"
+                    in sourceQuery `shouldResolveTo` expected
+
             context "queryError" $ do
                 let namedQuery name = "query " <> name <> " { philosopher(id: \"1\") { interest } }"
                     twoQueries = namedQuery "A" <> " " <> namedQuery "B"

tests/Language/GraphQL/Validate/RulesSpec.hs

@@ -29,6 +29,7 @@ queryType = ObjectType "Query" Nothing [] $ HashMap.fromList
     [ ("dog", dogResolver)
     , ("cat", catResolver)
     , ("findDog", findDogResolver)
+    , ("findCats", findCatsResolver)
     ]
   where
     dogField = Field Nothing (Out.NamedObjectType dogType) mempty
@@ -39,6 +40,11 @@ queryType = ObjectType "Query" Nothing [] $ HashMap.fromList
     findDogResolver = ValueResolver findDogField $ pure Null
     catField = Field Nothing (Out.NamedObjectType catType) mempty
     catResolver = ValueResolver catField $ pure Null
+    findCatsArguments = HashMap.singleton "commands"
+        $ In.Argument Nothing (In.NonNullListType $ In.NonNullEnumType catCommandType)
+        $ Just $ List []
+    findCatsField = Field Nothing (Out.NonNullListType $ Out.NonNullObjectType catType) findCatsArguments
+    findCatsResolver = ValueResolver findCatsField $ pure $ List []
 
 catCommandType :: EnumType
 catCommandType = EnumType "CatCommand" Nothing $ HashMap.fromList
@@ -538,7 +544,7 @@ spec =
                         }
                  in validate queryString `shouldContain` [expected]
 
-        context "noUndefinedVariablesRule" $
+        context "noUndefinedVariablesRule" $ do
             it "rejects undefined variables" $
                 let queryString = [gql|
                   query variableIsNotDefinedUsedInSingleFragment {
@@ -560,7 +566,35 @@ spec =
                         }
                  in validate queryString `shouldBe` [expected]
 
-        context "noUnusedVariablesRule" $
+            it "gets variable location inside an input object" $
+                let queryString = [gql|
+                  query {
+                    findDog (complex: { name: $name }) {
+                      name
+                    }
+                  }
+                |]
+                    expected = Error
+                        { message = "Variable \"$name\" is not defined."
+                        , locations = [AST.Location 2 29]
+                        }
+                 in validate queryString `shouldBe` [expected]
+
+            it "gets variable location inside an array" $
+                let queryString = [gql|
+                  query {
+                    findCats (commands: [JUMP, $command]) {
+                      name
+                    }
+                  }
+                |]
+                    expected = Error
+                        { message = "Variable \"$command\" is not defined."
+                        , locations = [AST.Location 2 30]
+                        }
+                 in validate queryString `shouldBe` [expected]
+
+        context "noUnusedVariablesRule" $ do
             it "rejects unused variables" $
                 let queryString = [gql|
                   query variableUnused($atOtherHomes: Boolean) {
@@ -577,6 +611,16 @@ spec =
                         }
                  in validate queryString `shouldBe` [expected]
 
+            it "detects variables in properties of input objects" $
+                let queryString = [gql|
+                  query withVar ($name: String!) {
+                    findDog (complex: { name: $name }) {
+                      name
+                    }
+                  }
+                |]
+                 in validate queryString `shouldBe` []
+
         context "uniqueInputFieldNamesRule" $
             it "rejects duplicate fields in input objects" $
                 let queryString = [gql|
@@ -878,7 +922,7 @@ spec =
                         { message =
                             "Variable \"$dogCommandArg\" of type \
                             \\"DogCommand\" used in position expecting type \
-                            \\"!DogCommand\"."
+                            \\"DogCommand!\"."
                         , locations = [AST.Location 1 26]
                         }
                  in validate queryString `shouldBe` [expected]
@@ -925,7 +969,7 @@ spec =
                 |]
                     expected = Error
                         { message =
-                            "Value 3 cannot be coerced to type \"!CatCommand\"."
+                            "Value 3 cannot be coerced to type \"CatCommand!\"."
                         , locations = [AST.Location 3 36]
                         }
                  in validate queryString `shouldBe` [expected]
@@ -940,7 +984,7 @@ spec =
                 |]
                     expected = Error
                         { message =
-                            "Value 3 cannot be coerced to type \"!String\"."
+                            "Value 3 cannot be coerced to type \"String!\"."
                         , locations = [AST.Location 2 28]
                         }
                  in validate queryString `shouldBe` [expected]