Retain types conforming to App Intents protocols

CHANGELOG.md

@@ -11,6 +11,7 @@
 ##### Bug Fixes
 
 - Fix indexing of xib/storyboard files in SPM projects.
+- Fix types conforming to App Intents protocols being reported as unused.
 
 ## 3.3.0 (2025-12-13)
 

Sources/BUILD.bazel

@@ -55,6 +55,7 @@ swift_library(
         "SourceGraph/Elements/SourceFile.swift",
         "SourceGraph/Mutators/AccessibilityCascader.swift",
         "SourceGraph/Mutators/AncestralReferenceEliminator.swift",
+        "SourceGraph/Mutators/AppIntentsRetainer.swift",
         "SourceGraph/Mutators/AssetReferenceRetainer.swift",
         "SourceGraph/Mutators/AssignOnlyPropertyReferenceEliminator.swift",
         "SourceGraph/Mutators/CodablePropertyRetainer.swift",

Sources/SourceGraph/Mutators/AppIntentsRetainer.swift

@@ -0,0 +1,34 @@
+import Configuration
+import Foundation
+import Shared
+
+/// Retains types conforming to App Intents protocols.
+///
+/// Types conforming to these protocols are discovered and invoked by the system at runtime,
+/// so they should not be reported as unused.
+final class AppIntentsRetainer: SourceGraphMutator {
+    private let graph: SourceGraph
+
+    /// USR prefix for Swift symbols from the AppIntents module.
+    /// Swift USRs encode the module name with a length prefix: "s:<length><module_name>..."
+    /// For AppIntents (10 characters), this becomes "s:10AppIntents".
+    private static let appIntentsModuleUsrPrefix = "s:10AppIntents"
+
+    required init(graph: SourceGraph, configuration _: Configuration, swiftVersion _: SwiftVersion) {
+        self.graph = graph
+    }
+
+    func mutate() {
+        graph
+            .declarations(ofKinds: [.class, .struct, .enum])
+            .lazy
+            .filter {
+                $0.related.contains {
+                    self.graph.isExternal($0) &&
+                        $0.kind == .protocol &&
+                        $0.usr.hasPrefix(Self.appIntentsModuleUsrPrefix)
+                }
+            }
+            .forEach { graph.markRetained($0) }
+    }
+}

Sources/SourceGraph/SourceGraphMutatorRunner.swift

@@ -38,6 +38,7 @@ public final class SourceGraphMutatorRunner {
         XCTestRetainer.self,
         SwiftTestingRetainer.self,
         SwiftUIRetainer.self,
+        AppIntentsRetainer.self,
         StringInterpolationAppendInterpolationRetainer.self,
         PropertyWrapperRetainer.self,
         ResultBuilderRetainer.self,

Tests/Fixtures/Package.swift

@@ -45,6 +45,9 @@ targets.append(contentsOf: [
     ),
     .target(
         name: "ObjcAnnotatedRetentionFixtures"
+    ),
+    .target(
+        name: "AppIntentsRetentionFixtures"
     )
 ])
 #endif

Tests/Fixtures/Sources/AppIntentsRetentionFixtures/testRetainsAppEntity.swift

@@ -0,0 +1,21 @@
+import AppIntents
+
+struct SimpleEntity: AppEntity {
+    static var typeDisplayRepresentation: TypeDisplayRepresentation = "Simple Entity"
+    static var defaultQuery = SimpleEntityQuery()
+
+    var id: String
+    var displayRepresentation: DisplayRepresentation {
+        DisplayRepresentation(title: "\(id)")
+    }
+}
+
+struct SimpleEntityQuery: EntityQuery {
+    func entities(for identifiers: [String]) async throws -> [SimpleEntity] {
+        []
+    }
+
+    func suggestedEntities() async throws -> [SimpleEntity] {
+        []
+    }
+}

Tests/Fixtures/Sources/AppIntentsRetentionFixtures/testRetainsAppEnum.swift

@@ -0,0 +1,12 @@
+import AppIntents
+
+enum SimpleAppEnum: String, AppEnum {
+    case optionA
+    case optionB
+
+    static var typeDisplayRepresentation: TypeDisplayRepresentation = "Simple Enum"
+    static var caseDisplayRepresentations: [SimpleAppEnum: DisplayRepresentation] = [
+        .optionA: "Option A",
+        .optionB: "Option B"
+    ]
+}

Tests/Fixtures/Sources/AppIntentsRetentionFixtures/testRetainsAppIntent.swift

@@ -0,0 +1,9 @@
+import AppIntents
+
+struct SimpleIntent: AppIntent {
+    static var title: LocalizedStringResource = "Simple Intent"
+
+    func perform() async throws -> some IntentResult {
+        .result()
+    }
+}

Tests/Fixtures/Sources/AppIntentsRetentionFixtures/testRetainsAppShortcutsProvider.swift

@@ -0,0 +1,20 @@
+import AppIntents
+
+struct ShortcutIntent: AppIntent {
+    static var title: LocalizedStringResource = "Shortcut Intent"
+
+    func perform() async throws -> some IntentResult {
+        .result()
+    }
+}
+
+struct SimpleShortcutsProvider: AppShortcutsProvider {
+    static var appShortcuts: [AppShortcut] {
+        AppShortcut(
+            intent: ShortcutIntent(),
+            phrases: ["Run shortcut"],
+            shortTitle: "Shortcut",
+            systemImageName: "star"
+        )
+    }
+}

Tests/PeripheryTests/AppIntentsRetentionTest.swift

@@ -0,0 +1,31 @@
+#if os(macOS)
+    @testable import TestShared
+    import XCTest
+
+    final class AppIntentsRetentionTest: FixtureSourceGraphTestCase {
+        func testRetainsAppIntent() {
+            analyze {
+                assertReferenced(.struct("SimpleIntent"))
+            }
+        }
+
+        func testRetainsAppEntity() {
+            analyze {
+                assertReferenced(.struct("SimpleEntity"))
+                assertReferenced(.struct("SimpleEntityQuery"))
+            }
+        }
+
+        func testRetainsAppEnum() {
+            analyze {
+                assertReferenced(.enum("SimpleAppEnum"))
+            }
+        }
+
+        func testRetainsAppShortcutsProvider() {
+            analyze {
+                assertReferenced(.struct("SimpleShortcutsProvider"))
+            }
+        }
+    }
+#endif