Update ViewAlias (#289)

* Update ViewAlias

* Add ViewAlias documentation

* Add Empty ViewAliasTests

* Fix AnyAttribute issue on ViewAlias for Linux

Author: Kyle-Ye

Sources/OpenSwiftUI/OpenGraph/Attribute/AnyAttribute.swift

@@ -0,0 +1,156 @@
+//
+//  AnyAttributeFix.swift
+//  OpenSwiftUI
+
+#if !canImport(Darwin)
+package import OpenGraphShims
+
+package typealias AnyAttribute = OpenSwiftUICore.AnyAttribute
+package typealias AttributeInfo = OpenSwiftUICore.AttributeInfo
+
+package typealias AttributeType = OpenSwiftUICore.AttributeType
+
+extension AnyAttribute {
+    package static var `nil`: AnyAttribute { AnyAttribute(rawValue: 0x2) }
+
+    package var source: AnyAttribute? {
+        get { preconditionFailure("#39") }
+        nonmutating set { preconditionFailure("#39") }
+    }
+
+    package var info: AttributeInfo {
+        preconditionFailure("#39")
+    }
+
+    package var graph: Graph {
+        preconditionFailure("#39")
+    }
+
+    package func invalidateValue() {
+        preconditionFailure("#39")
+    }
+
+    package func createIndirect() -> AnyAttribute {
+        preconditionFailure("#39")
+    }
+}
+
+extension AnyAttribute {
+    package init<Value>(_ attribute: Attribute<Value>) {
+        self = Swift.unsafeBitCast(attribute, to: AnyAttribute.self)
+    }
+
+    package func unsafeCast<Value>(to type: Value.Type) -> Attribute<Value> {
+        Swift.unsafeBitCast(self, to: Attribute<Value>.self)
+    }
+
+    package static var current: AnyAttribute? {
+        preconditionFailure("#39")
+    }
+
+    package func unsafeOffset(at offset: Int) -> AnyAttribute {
+        preconditionFailure("#39")
+    }
+
+    package func setFlags(_ newFlags: OGAttributeFlags, mask: OGAttributeFlags) {
+        preconditionFailure("#39")
+    }
+
+    package func addInput(_ attribute: AnyAttribute, options: OGInputOptions = [], token: Int) {
+        preconditionFailure("#39")
+    }
+
+    package func addInput<Value>(_ attribute: Attribute<Value>, options: OGInputOptions = [], token: Int) {
+        preconditionFailure("#39")
+    }
+
+    package func visitBody<Visitor>(_ visitor: inout Visitor) where Visitor: AttributeBodyVisitor {
+        preconditionFailure("#39")
+    }
+
+    package func mutateBody<Value>(as: Value.Type, invalidating: Bool, _ body: (inout Value) -> Void) {
+        preconditionFailure("#39")
+    }
+
+    package func breadthFirstSearch(options: OGSearchOptions = [], _: (AnyAttribute) -> Bool) -> Bool {
+        preconditionFailure("#39")
+    }
+
+    package var _bodyType: any Any.Type {
+        preconditionFailure("#39")
+    }
+
+    package var _bodyPointer: UnsafeRawPointer {
+        preconditionFailure("#39")
+    }
+
+    package var valueType: any Any.Type {
+        preconditionFailure("#39")
+    }
+
+    package var indirectDependency: AnyAttribute? {
+        get { preconditionFailure("#39") }
+        nonmutating set { preconditionFailure("#39") }
+    }
+}
+
+extension Attribute {
+    package init(identifier: AnyAttribute) {
+        self = Swift.unsafeBitCast(identifier.rawValue, to: Attribute.self)
+    }
+
+    package var identifier: AnyAttribute {
+        get { AnyAttribute(rawValue: Swift.unsafeBitCast(self, to: UInt32.self)) }
+        nonmutating set { preconditionFailure("#39") }
+    }
+}
+
+extension AnyWeakAttribute {
+    package var attribute: AnyAttribute? {
+        preconditionFailure("#39")
+    }
+
+    package init(_ attribute: AnyAttribute?) {
+        preconditionFailure("#39")
+    }
+}
+
+extension IndirectAttribute {
+    package var identifier: AnyAttribute {
+        AnyAttribute(rawValue: Swift.unsafeBitCast(self, to: UInt32.self))
+    }
+}
+
+extension AnyRuleContext {
+    package init(attribute: AnyAttribute) {
+        self = Swift.unsafeBitCast(attribute.rawValue, to: AnyRuleContext.self)
+    }
+
+    package var attribute: AnyAttribute { AnyAttribute(rawValue: Swift.unsafeBitCast(self, to: UInt32.self)) }
+}
+
+extension AnyOptionalAttribute {
+    package static var current: AnyOptionalAttribute {
+        preconditionFailure("#39")
+    }
+
+    package var identifier: AnyAttribute { AnyAttribute(rawValue: Swift.unsafeBitCast(self, to: UInt32.self)) }
+
+    package var attribute: AnyAttribute? {
+        get { preconditionFailure("#39") }
+        nonmutating set { preconditionFailure("#39") }
+    }
+}
+
+extension Graph {
+    package static func setInvalidationCallback(_ graph: Graph, callback: ((AnyAttribute) -> Void)?) {
+        preconditionFailure("#39")
+    }
+}
+
+extension Subgraph {
+    package func forEach(_ flags: OGAttributeFlags, _ callback: (AnyAttribute) -> Void) {
+        preconditionFailure("#39")
+    }
+}
+#endif