OSS-15 Initial submit.

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

LICENSE.md

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+# Boost Software License - Version 1.0
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

Package.swift

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+// swift-tools-version:5.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "MisoViewOptional",
+    platforms: [.macOS(.v10_15),
+                .iOS(.v13),
+                .tvOS(.v13),
+                .watchOS(.v6)],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "MisoViewOptional",
+            targets: ["MisoViewOptional"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "MisoViewOptional",
+            dependencies: [])
+    ]
+)

README.md

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+# MisoViewOptional
+
+## SwiftUI package to allow for conditional compilation of modifiers
+
+This is the simplest Swift package ever. It's mostly a design pattern to allow for an optional modifier that returns an AnyView.
+
+### Why?
+
+When you compile something conditionally, sometimes, a modifier is not available in a platform. For example, macOS doesn't support `navigationBarItems`, and you cannot simply do
+
+```
+VStack {
+   Spacer()
+}
+#if !os(macOS)
+.navigationBarItems(...)
+#endif
+```
+
+Also, the usual pattern of setting someting to nil doesn't actually work.
+
+There are also some other uses, especially when some modifiers don't support a `nil` default. You can `if` its usage completely away through the `.optional` modifier.
+
+### Why AnyView?
+
+Not only is this not hurting the performance, but also, due to Swift's lack of preprocessor, the `#if` is actually defined as a command. And because the `#else` is undefined, the system cannot determine what should be the return type. There might be a better design pattern, and please don't hesitate to provide a better implementation.
+
+## Usage
+
+```
+import MisoViewOptional
+
+VStack {
+    Spacer()
+}
+.frame(width: 123, height: 456)
+.optional() { content in
+    #if os(macOS)
+    return AnyView(content)
+    #else
+    return AnyView(content.navigationBarTitle("MyTitle")
+                          .navigationBarItems(trailing: doneButton))
+    #endif
+}
+```
+
+## Colophon
+
+[The official address for this package][0]
+
+[The git / package url][1]
+
+This package is created and maintained by [Misoservices Inc.][2] and is [licensed under the BSL-1.0: Boost Software License - Version 1.0][3].
+
+
+[0]: https://github.com/Misoservices/MisoViewOptional
+[1]: https://github.com/Misoservices/MisoViewOptional.git
+[2]: https://misoservices.com
+[3]: https://choosealicense.com/licenses/bsl-1.0/

Sources/MisoViewOptional/View+optional.swift

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+//
+//  View+optional.swift
+//  MisoViewOptional
+//
+//  Created by Michel Donais on 2020-03-03.
+//  Copyright © 2020 Misoservices Inc. All rights reserved.
+//  [BSL-1.0] This package is Licensed under the Boost Software License - Version 1.0
+//
+
+import SwiftUI
+
+public extension View {
+    func optional( modifiers: (Self)->AnyView ) -> AnyView {
+        modifiers(self)
+    }
+}