diff --git a/Sources/WebIDLToSwift/ClosurePattern.swift b/Sources/WebIDLToSwift/ClosurePattern.swift
index d06c2d9f..e6e93d94 100644
--- a/Sources/WebIDLToSwift/ClosurePattern.swift
+++ b/Sources/WebIDLToSwift/ClosurePattern.swift
@@ -1,6 +1,6 @@
 struct ClosurePattern: SwiftRepresentable, Equatable, Hashable, Comparable {
     static func < (lhs: ClosurePattern, rhs: ClosurePattern) -> Bool {
-        lhs.name.source < rhs.name.source
+        lhs.closureType.source < rhs.closureType.source
     }
 
     let nullable: Bool
@@ -22,16 +22,16 @@ struct ClosurePattern: SwiftRepresentable, Equatable, Hashable, Comparable {
         return nullable ? "(\(closure))?" : closure
     }
 
-    private var getter: SwiftSource {
+    func getter(name: SwiftSource) -> SwiftSource {
         let getFunction: SwiftSource
         if nullable {
             getFunction = """
-            guard let function = jsObject[name].function else {
+            guard let function = jsObject[\(name)].function else {
                 return nil
             }
             """
         } else {
-            getFunction = "let function = jsObject[name].function!"
+            getFunction = "let function = jsObject[\(name)].function!"
         }
         let call: SwiftSource = "function(\(sequence: indexes.map { "_toJSValue($\($0))" }))"
         let closureBody: SwiftSource
@@ -66,15 +66,15 @@ struct ClosurePattern: SwiftRepresentable, Equatable, Hashable, Comparable {
         """
     }
 
-    private var setter: SwiftSource {
-        let setClosure: SwiftSource = "jsObject[name] = \(jsClosureWrapper(name: "newValue"))"
+    func setter(name: SwiftSource) -> SwiftSource {
+        let setClosure: SwiftSource = "jsObject[\(name)] = \(jsClosureWrapper(name: "newValue"))"
 
         if nullable {
             return """
                 if let newValue = newValue {
                     \(setClosure)
                 } else {
-                    jsObject[name] = .null
+                    jsObject[\(name)] = .null
                 }
             """
         } else {
@@ -121,6 +121,7 @@ struct ClosurePattern: SwiftRepresentable, Equatable, Hashable, Comparable {
         """
     }
 
+
     var toJSValue: SwiftSource {
         let escaping: SwiftSource = nullable ? "" : "@escaping"
         return """
@@ -132,7 +133,6 @@ struct ClosurePattern: SwiftRepresentable, Equatable, Hashable, Comparable {
 
     var swiftRepresentation: SwiftSource {
         """
-        \(propertyWrapper)
         \(toJSValue)
         """
     }
diff --git a/Sources/WebIDLToSwift/IDLBuilder.swift b/Sources/WebIDLToSwift/IDLBuilder.swift
index 21429dbb..9cb8ac64 100644
--- a/Sources/WebIDLToSwift/IDLBuilder.swift
+++ b/Sources/WebIDLToSwift/IDLBuilder.swift
@@ -2,7 +2,7 @@ import Foundation
 import WebIDL
 
 enum IDLBuilder {
-    static let basicDependencies = ["ECMAScript", "JavaScriptKit", "JavaScriptEventLoop"]
+    static let basicDependencies = ["ECMAScript", "JavaScriptKit"]
     static let optionalDependencies = ["JavaScriptEventLoop"]
 
     static let preamble = """
@@ -95,9 +95,8 @@ enum IDLBuilder {
     }
 
     static func generateClosureTypes() throws -> SwiftSource {
-        print("Generating closure property wrappers...")
+        print("Generating closure wrappers...")
         return """
-        /* variadic generics please */
         \(lines: ModuleState.closurePatterns.sorted().map(\.swiftRepresentation))
         """
     }
diff --git a/Sources/WebIDLToSwift/MergeDeclarations.swift b/Sources/WebIDLToSwift/MergeDeclarations.swift
index 5b042cbe..48b7b2d9 100644
--- a/Sources/WebIDLToSwift/MergeDeclarations.swift
+++ b/Sources/WebIDLToSwift/MergeDeclarations.swift
@@ -7,9 +7,6 @@ enum DeclarationMerger {
         "CustomElementConstructor",
         "ArrayBufferView",
         "RotationMatrixType",
-        // Mapped to `Int32` manually. This can't be represented as `Int64` due to `BigInt` representation on JS side,
-        // but as a pointer it can't be represented as floating point number either.
-        "GLintptr",
     ]
     static let ignoredIncludeTargets: Set<String> = ["WorkerNavigator"]
     static let validExposures: Set<String> = ["Window"]
diff --git a/Sources/WebIDLToSwift/WebIDL+SwiftRepresentation.swift b/Sources/WebIDLToSwift/WebIDL+SwiftRepresentation.swift
index c1a0b5dd..07ec10ed 100644
--- a/Sources/WebIDLToSwift/WebIDL+SwiftRepresentation.swift
+++ b/Sources/WebIDLToSwift/WebIDL+SwiftRepresentation.swift
@@ -5,7 +5,7 @@ extension IDLArgument: SwiftRepresentable {
         let type: SwiftSource
         if variadic {
             type = "\(idlType)..."
-        } else if idlType.isFunction, !optional, !idlType.nullable {
+        } else if idlType.closurePattern != nil && !optional && !idlType.nullable {
             type = "@escaping \(idlType)"
         } else {
             type = "\(idlType)"
@@ -23,7 +23,7 @@ extension IDLArgument: SwiftRepresentable {
     }
 }
 
-extension IDLAttribute: SwiftRepresentable, Initializable {
+extension IDLAttribute: SwiftRepresentable {
     private var wrapperName: SwiftSource {
         "_\(raw: name)"
     }
@@ -247,12 +247,16 @@ extension MergedInterface: SwiftRepresentable {
         ]
         let access: SwiftSource = openClasses.contains(name) ? "open" : "public"
 
+        let hasAsyncSequence: Bool
         let header: SwiftSource
         if partial {
             header = "public extension \(name)"
+            hasAsyncSequence = false
         } else {
             let inheritance = (parentClasses.isEmpty ? ["JSBridgedClass"] : parentClasses) + mixins
+                .filter { $0 != "AsyncSequence" }
             header = "\(access) class \(name): \(sequence: inheritance.map(SwiftSource.init(_:)))"
+            hasAsyncSequence = mixins.contains { $0 == "AsyncSequence" }
         }
 
         return """
@@ -269,13 +273,22 @@ extension MergedInterface: SwiftRepresentable {
                 """ : "")
 
                 public required init(unsafelyWrapping jsObject: JSObject) {
-                    \(memberInits.joined(separator: "\n"))
                     \(parentClasses.isEmpty ? "self.jsObject = jsObject" : "super.init(unsafelyWrapping: jsObject)")
                 }
             """)
 
             \(body)
         }
+
+        \(hasAsyncSequence ?
+            """
+            #if canImport(JavaScriptEventLoop)
+            public extension \(name): AsyncSequence {}
+            #endif
+            """ :
+            ""
+        )
+
         """
     }
 
@@ -380,11 +393,13 @@ extension IDLIterableDeclaration: SwiftRepresentable, Initializable {
     var swiftRepresentation: SwiftSource {
         if async {
             return """
+            #if canImport(JavaScriptEventLoop)
             public typealias Element = \(idlType[0])
             @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
             public func makeAsyncIterator() -> ValueIterableAsyncIterator<\(ModuleState.className)> {
                 ValueIterableAsyncIterator(sequence: self)
             }
+            #endif
             """
         } else {
             return """