Don’t re-declare protocols from partial interface mixins

Author: j-f1

Sources/CSSOM/Generated.swift

@@ -1640,7 +1640,6 @@ public class ConvertCoordinateOptions: BridgedDictionary {
     public var toBox: CSSBoxType
 }
 
-public protocol DocumentOrShadowRoot: JSBridgedClass {}
 public extension DocumentOrShadowRoot {
     @inlinable var styleSheets: StyleSheetList { jsObject[Strings.styleSheets].fromJSValue()! }
 

Sources/Gamepad/Generated.swift

@@ -377,7 +377,6 @@ public class Navigator: JSBridgedClass {
     }
 }
 
-public protocol WindowEventHandlers: JSBridgedClass {}
 public extension WindowEventHandlers {
     @inlinable var ongamepadconnected: EventHandler {
         get { ClosureAttribute1Optional[Strings.ongamepadconnected, in: jsObject] }

Sources/WebAnimations/Generated.swift

@@ -340,7 +340,6 @@ public class ComputedEffectTiming: BridgedDictionary {
     public var currentIteration: Double?
 }
 
-public protocol DocumentOrShadowRoot: JSBridgedClass {}
 public extension DocumentOrShadowRoot {
     @inlinable func getAnimations() -> [Animation] {
         let this = jsObject

Sources/WebIDLToSwift/MergeDeclarations.swift

@@ -102,12 +102,14 @@ enum DeclarationMerger {
             grouping: allNodes(ofType: IDLInterfaceMixin.self).map {
                 MergedMixin(
                     name: $0.name,
+                    partial: $0.partial,
                     members: enhanceMembers($0.members.array) as! [IDLInterfaceMixinMember]
                 )
             },
             by: \.name
         ).mapValues {
             $0.dropFirst().reduce(into: $0.first!) { partialResult, mixin in
+                partialResult.partial = partialResult.partial && mixin.partial
                 partialResult.members += mixin.members
             }
         }
@@ -273,6 +275,7 @@ struct MergedNamespace: DeclarationFile {
 
 struct MergedMixin: DeclarationFile {
     let name: String
+    var partial: Bool
     var members: [IDLInterfaceMixinMember]
 }
 

Sources/WebIDLToSwift/WebIDL+SwiftRepresentation.swift

@@ -305,7 +305,7 @@ extension MergedMixin: SwiftRepresentable {
     var swiftRepresentation: SwiftSource {
         ModuleState.withScope(.instance(constructor: nil, this: "jsObject", className: "\(name)", inProtocol: true)) {
             """
-            public protocol \(name): JSBridgedClass {}
+            \(partial ? "" : "public protocol \(name): JSBridgedClass {}")
             public extension \(name) {
                 \(members.map(toSwift).joined(separator: "\n\n"))
             }