feature: final class definitions for graphql codegen

Sources/ApolloCodegenLib/ApolloCodegenConfiguration.swift

@@ -503,6 +503,8 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
     ///
     ///  Defaults to `true`.
     public let pruneGeneratedFiles: Bool
+    /// Whether generated GraphQL operation and local cache mutation class types will be marked as `final`.
+    public let markOperationDefinitionsAsFinal: Bool
 
     /// Default property values
     public struct Default {
@@ -515,6 +517,7 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
       public static let warningsOnDeprecatedUsage: Composition = .include
       public static let conversionStrategies: ConversionStrategies = .init()
       public static let pruneGeneratedFiles: Bool = true
+      public static let markOperationDefinitionsAsFinal: Bool = false
     }
 
     /// Designated initializer.
@@ -535,6 +538,7 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
     ///   - conversionStrategies: Rules for how to convert the names of values from the schema in
     ///     generated code.
     ///   - pruneGeneratedFiles: Whether unused generated files will be automatically deleted.
+    ///   - markOperationDefinitionsAsFinal: Whether generated GraphQL operation and local cache mutation class types will be marked as `final`.
     public init(
       additionalInflectionRules: [InflectionRule] = Default.additionalInflectionRules,
       deprecatedEnumCases: Composition = Default.deprecatedEnumCases,
@@ -544,7 +548,8 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
       cocoapodsCompatibleImportStatements: Bool = Default.cocoapodsCompatibleImportStatements,
       warningsOnDeprecatedUsage: Composition = Default.warningsOnDeprecatedUsage,
       conversionStrategies: ConversionStrategies = Default.conversionStrategies,
-      pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles
+      pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles,
+      markOperationDefinitionsAsFinal: Bool = Default.markOperationDefinitionsAsFinal
     ) {
       self.additionalInflectionRules = additionalInflectionRules
       self.deprecatedEnumCases = deprecatedEnumCases
@@ -555,6 +560,7 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
       self.warningsOnDeprecatedUsage = warningsOnDeprecatedUsage
       self.conversionStrategies = conversionStrategies
       self.pruneGeneratedFiles = pruneGeneratedFiles
+      self.markOperationDefinitionsAsFinal = markOperationDefinitionsAsFinal
     }
 
     // MARK: Codable
@@ -571,6 +577,7 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
       case warningsOnDeprecatedUsage
       case conversionStrategies
       case pruneGeneratedFiles
+      case markOperationDefinitionsAsFinal
     }
 
     public init(from decoder: Decoder) throws {
@@ -626,6 +633,11 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
         Bool.self,
         forKey: .pruneGeneratedFiles
       ) ?? Default.pruneGeneratedFiles
+
+      markOperationDefinitionsAsFinal = try values.decodeIfPresent(
+        Bool.self,
+        forKey: .markOperationDefinitionsAsFinal
+      ) ?? Default.markOperationDefinitionsAsFinal
     }
 
     public func encode(to encoder: Encoder) throws {
@@ -640,6 +652,7 @@ public struct ApolloCodegenConfiguration: Codable, Equatable {
       try container.encode(self.warningsOnDeprecatedUsage, forKey: .warningsOnDeprecatedUsage)
       try container.encode(self.conversionStrategies, forKey: .conversionStrategies)
       try container.encode(self.pruneGeneratedFiles, forKey: .pruneGeneratedFiles)
+      try container.encode(self.markOperationDefinitionsAsFinal, forKey: .markOperationDefinitionsAsFinal)
     }
   }
 
@@ -1332,8 +1345,9 @@ extension ApolloCodegenConfiguration.OutputOptions {
   ///   - conversionStrategies: Rules for how to convert the names of values from the schema in
   ///     generated code.
   ///   - pruneGeneratedFiles: Whether unused generated files will be automatically deleted.
+  ///   - markOperationDefinitionsAsFinal: Whether generated GraphQL operation and local cache mutation class types will be marked as `final`.
   @available(*, deprecated,
-              renamed: "init(additionalInflectionRules:queryStringLiteralFormat:deprecatedEnumCases:schemaDocumentation:selectionSetInitializers:operationDocumentFormat:cocoapodsCompatibleImportStatements:warningsOnDeprecatedUsage:conversionStrategies:pruneGeneratedFiles:)"
+              renamed: "init(additionalInflectionRules:queryStringLiteralFormat:deprecatedEnumCases:schemaDocumentation:selectionSetInitializers:operationDocumentFormat:cocoapodsCompatibleImportStatements:warningsOnDeprecatedUsage:conversionStrategies:pruneGeneratedFiles:markOperationDefinitionsAsFinal:)"
   )
   public init(
     additionalInflectionRules: [InflectionRule] = Default.additionalInflectionRules,
@@ -1345,7 +1359,8 @@ extension ApolloCodegenConfiguration.OutputOptions {
     cocoapodsCompatibleImportStatements: Bool = Default.cocoapodsCompatibleImportStatements,
     warningsOnDeprecatedUsage: ApolloCodegenConfiguration.Composition = Default.warningsOnDeprecatedUsage,
     conversionStrategies: ApolloCodegenConfiguration.ConversionStrategies = Default.conversionStrategies,
-    pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles
+    pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles,
+    markOperationDefinitionsAsFinal: Bool = Default.markOperationDefinitionsAsFinal
   ) {
     self.additionalInflectionRules = additionalInflectionRules
     self.deprecatedEnumCases = deprecatedEnumCases
@@ -1356,6 +1371,7 @@ extension ApolloCodegenConfiguration.OutputOptions {
     self.warningsOnDeprecatedUsage = warningsOnDeprecatedUsage
     self.conversionStrategies = conversionStrategies
     self.pruneGeneratedFiles = pruneGeneratedFiles
+    self.markOperationDefinitionsAsFinal = markOperationDefinitionsAsFinal
   }
 
   /// Deprecated initializer.
@@ -1378,8 +1394,9 @@ extension ApolloCodegenConfiguration.OutputOptions {
   ///   - conversionStrategies: Rules for how to convert the names of values from the schema in
   ///     generated code.
   ///   - pruneGeneratedFiles: Whether unused generated files will be automatically deleted.
+  ///   - markOperationDefinitionsAsFinal: Whether generated GraphQL operation and local cache mutation class types will be marked as `final`.
   @available(*, deprecated,
-              renamed: "init(additionalInflectionRules:deprecatedEnumCases:schemaDocumentation:selectionSetInitializers:operationDocumentFormat:cocoapodsCompatibleImportStatements:warningsOnDeprecatedUsage:conversionStrategies:pruneGeneratedFiles:)"
+              renamed: "init(additionalInflectionRules:deprecatedEnumCases:schemaDocumentation:selectionSetInitializers:operationDocumentFormat:cocoapodsCompatibleImportStatements:warningsOnDeprecatedUsage:conversionStrategies:pruneGeneratedFiles:markOperationDefinitionsAsFinal:)"
   )
   public init(
     additionalInflectionRules: [InflectionRule] = Default.additionalInflectionRules,
@@ -1391,7 +1408,8 @@ extension ApolloCodegenConfiguration.OutputOptions {
     cocoapodsCompatibleImportStatements: Bool = Default.cocoapodsCompatibleImportStatements,
     warningsOnDeprecatedUsage: ApolloCodegenConfiguration.Composition = Default.warningsOnDeprecatedUsage,
     conversionStrategies: ApolloCodegenConfiguration.ConversionStrategies = Default.conversionStrategies,
-    pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles
+    pruneGeneratedFiles: Bool = Default.pruneGeneratedFiles,
+    markOperationDefinitionsAsFinal: Bool = Default.markOperationDefinitionsAsFinal
   ) {
     self.additionalInflectionRules = additionalInflectionRules
     self.deprecatedEnumCases = deprecatedEnumCases
@@ -1402,6 +1420,7 @@ extension ApolloCodegenConfiguration.OutputOptions {
     self.warningsOnDeprecatedUsage = warningsOnDeprecatedUsage
     self.conversionStrategies = conversionStrategies
     self.pruneGeneratedFiles = pruneGeneratedFiles
+    self.markOperationDefinitionsAsFinal = markOperationDefinitionsAsFinal
   }
 
   /// Whether the generated operations should use Automatic Persisted Queries.

Sources/ApolloCodegenLib/Templates/LocalCacheMutationDefinitionTemplate.swift

@@ -15,7 +15,7 @@ struct LocalCacheMutationDefinitionTemplate: OperationTemplateRenderer {
     return TemplateString(
     """
     \(accessControlModifier(for: .parent))\
-    class \(operation.generatedDefinitionName): LocalCacheMutation {
+    \(classDefinitionKeywords) \(operation.generatedDefinitionName): LocalCacheMutation {
       \(memberAccessControl)static let operationType: GraphQLOperationType = .\(operation.definition.operationType.rawValue)
 
       \(section: VariableProperties(operation.definition.variables))

Sources/ApolloCodegenLib/Templates/OperationDefinitionTemplate.swift

@@ -46,7 +46,7 @@ struct OperationDefinitionTemplate: OperationTemplateRenderer {
   private func OperationDeclaration() -> TemplateString {
     return """
     \(accessControlModifier(for: .parent))\
-    class \(operation.generatedDefinitionName): \
+    \(classDefinitionKeywords) \(operation.generatedDefinitionName): \
     \(operation.definition.operationType.renderedProtocolName) {
       \(accessControlModifier(for: .member))\
     static let operationName: String = "\(operation.definition.name)"

Sources/ApolloCodegenLib/Templates/TemplateRenderer.swift

@@ -163,6 +163,8 @@ enum AccessControlScope {
 }
 
 extension TemplateRenderer {
+  var classDefinitionKeywords: String { config.options.markOperationDefinitionsAsFinal ? "final class" : "class" }
+
   func accessControlModifier(for scope: AccessControlScope) -> String {
     switch target {
     case .moduleFile, .schemaFile: return schemaAccessControlModifier(scope: scope)

Tests/ApolloCodegenTests/ApolloCodegenConfigurationCodableTests.swift

@@ -49,7 +49,8 @@ class ApolloCodegenConfigurationCodableTests: XCTestCase {
             enumCases: .none,
             fieldAccessors: .camelCase
           ),
-          pruneGeneratedFiles: false
+          pruneGeneratedFiles: false,
+          markOperationDefinitionsAsFinal: true
         ),
         experimentalFeatures: .init(
           clientControlledNullability: true,
@@ -98,6 +99,7 @@ class ApolloCodegenConfigurationCodableTests: XCTestCase {
             "fieldAccessors" : "camelCase"
           },
           "deprecatedEnumCases" : "exclude",
+          "markOperationDefinitionsAsFinal" : true,
           "operationDocumentFormat" : [
             "definition"
           ],

Tests/ApolloCodegenTests/CodeGeneration/Templates/LocalCacheMutationDefinitionTemplateTests.swift

@@ -245,6 +245,26 @@ class LocalCacheMutationDefinitionTemplateTests: XCTestCase {
     expect(actual).to(equalLineByLine(expected, ignoringExtraLines: true))
   }
 
+  func test__generate_givenQuery_configIncludesMarkOperationDefinitionsAsFinal_generatesFinalLocalCacheMutation() throws {
+    // given
+    let expected =
+    """
+    final class TestOperationLocalCacheMutation: LocalCacheMutation {
+      static let operationType: GraphQLOperationType = .query
+    """
+
+    config = .mock(options: .init(markOperationDefinitionsAsFinal: true))
+
+    // when
+    try buildSubjectAndOperation()
+
+    let actual = renderSubject()
+
+    // then
+    expect(actual).to(equalLineByLine(expected, ignoringExtraLines: true))
+  }
+
+
   func test__generate__givenQueryWithLowercasing_generatesCorrectlyCasedLocalCacheMutation() throws {
     // given
     schemaSDL = """