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@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
extension AnyPublisher {
    static var empty: Self {
        Empty(completeImmediately: false).eraseToAnyPublisher()
    }
    
    static func constant(_ value: Output) -> Self where Failure == Never {
        Just(value).eraseToAnyPublisher()
    }
}

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extension View {
    public func textFieldFocusableArea() -> some View {
        TextFieldButton { self.contentShape(Rectangle()) }
    }
}

fileprivate struct TextFieldButton<Label: View>: View {
    init(label: @escaping () -> Label) {
        self.label = label
    }

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protocol EmptyOrNil {
    var isEmpty: Bool { get }
}

extension Optional where Wrapped: EmptyOrNil {
    var isEmptyOrNil: Bool {
        return self?.isEmpty ?? true
    }
}

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import SwiftUI

/// Reads the width of the selection box next to a List row when editing mode is .active
///
/// Note: On iOS 15 the listRowInsets do not respond to updates so if you want to offset
/// the cell you should use negative leading padding.
public struct ListSelectionBoxWidthReader<Content: View>: View {
  @State private var boxWidth: CGFloat = 0
  private var content: (CGFloat) -> Content

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public protocol HierarchyDescription {
    associatedtype Child: HierarchyDescription
    var children: [Child] { get }
    var description: String { get }
}

extension HierarchyDescription {
    public var hierarchyDescription: String {
        var description = self.description
        for child in children {

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// MARK: Appending closures `a + b`

/// Append closures, lhs first.
public func + <I>(lhs: @escaping (I) -> Void, rhs: @escaping (I) -> Void) -> ((I) -> Void) {
    return {
        lhs($0)
        rhs($0)
    }
}

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import Foundation

extension Date {
    
    /// Returns date where **-component** is rounded to its closest
    /// multiple of **-amount**. Warning: month and day start at 1
    /// so round(to: 6, .month) will either return month 1 or 7!
    func round(to amount: Int, _ component: Calendar.Component) -> Date {
        let cal = Calendar.current
        var value = cal.component(component, from: self)

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/// Fixed swipe gesture NavigationLink
struct NavigationLink<Destination: View, Label:View>: View {
    var destination: Destination
    var label: () -> Label
    
    public init(destination: Destination, @ViewBuilder label: @escaping () -> Label) {
        self.destination = destination
        self.label = label
    }
    

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extension View {
    /// Controls the application's preferred home indicator auto-hiding when this view is shown.
    func prefersHomeIndicatorAutoHidden(_ value: Bool) -> some View {
        preference(key: PreferenceUIHostingController.PrefersHomeIndicatorAutoHiddenPreferenceKey.self, value: value)
    }
    
    /// Controls the application's preferred screen edges deferring system gestures when this view is shown. Default is UIRectEdgeNone.
    func edgesDeferringSystemGestures(_ edge: UIRectEdge) -> some View {
        preference(key: PreferenceUIHostingController.PreferredScreenEdgesDeferringSystemGesturesPreferenceKey.self, value: edge)
    }

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extension Binding {
    /// Wrapper to listen to didSet of Binding
    func didSet(_ didSet: @escaping ((newValue: Value, oldValue: Value)) -> Void) -> Binding<Value> {
        return .init(get: { self.wrappedValue }, set: { newValue in
            let oldValue = self.wrappedValue
            self.wrappedValue = newValue
            didSet((newValue, oldValue))
        })
    }