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/// An action that updates a value stored in the environment.
///
/// ## Overview
///
/// Use an `Updater` to allow descendant views to modify a value owned by
/// an ancestor view, without passing Bindings or specific update actions for each property.
/// The updater accepts a ``WritableKeyPath`` and a new value, then applies
/// the change through a closure you provide at initialization.
///
/// ### Setting up the updater

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extension View {
    func streamChanges<Value: Equatable & Sendable>(
        of value: Value,
        provideStream: @escaping @Sendable (AsyncStream<Value>) async -> Void
    ) -> some View {
        modifier(ChangeStream(value: value, provideStream: provideStream))
    }
}

private struct ChangeStream<Value: Equatable & Sendable>: ViewModifier {

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import SwiftUI

struct SelfSizingSheetPresentation: ViewModifier {
    private enum BoundsPreference: PreferenceKey {
        static let defaultValue: Anchor<CGRect>? = nil

        static func reduce(value: inout Value, nextValue: () -> Value) {
            value = nextValue()
        }
    }

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/// An AsyncSequence that iterates at most once every `interval`
public struct AsyncIntervalSequence<Base: AsyncSequence, C: Clock> {
    public let base: Base
    public let interval: C.Instant.Duration
    public let clock: C

    public init(_ base: Base, interval: C.Instant.Duration, clock: C) {
        self.base = base
        self.interval = interval
        self.clock = clock

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/// An AsyncSequence that will terminate with a `Timeout` error if
/// iteration time exceeds the provided `timeout`.
struct AsyncTimeoutSequence<Base: AsyncSequence, C: Clock> {
    struct Timeout: Error {}

    let base: Base
    let timeout: C.Instant.Duration
    let clock: C

    init(_ base: Base, timeout: C.Instant.Duration, clock: C) {

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import SwiftUI

struct RecursiveModifier<Data: Collection, Transformed: View>: ViewModifier {
    let data: Data
    let transform: (Data.Element, AnyView) -> Transformed

    func body(content: Content) -> some View {
        var subsequence = data[...]

        if let first = subsequence.popFirst() {

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import SwiftUI

// MARK: Navigation

enum Screen: String, Hashable, CaseIterable, CustomStringConvertible {
    case first, second, third

    var description: String {
        rawValue.capitalized
    }

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struct AsyncWrappedSequence<Base: Sequence>: AsyncSequence {
    typealias Element = Base.Element

    struct AsyncIterator<BaseIterator>: AsyncIteratorProtocol where BaseIterator == Base.Iterator {
        var base: BaseIterator

        mutating func next() async -> BaseIterator.Element? {
            base.next()
        }
    }

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struct AnyAsyncSequence<Element>: AsyncSequence {
    struct AnyAsyncIterator: AsyncIteratorProtocol {
        private let _next: () async throws -> Element?

        init<Base: AsyncSequence>(_ base: Base) where Base.Element == Element {
            var baseIterator = base.makeAsyncIterator()
            self._next = { try await baseIterator.next() }
        }

        func next() async throws -> Element? {

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import UIKit

class AsyncButton: UIButton {
    private var continuation: AsyncStream<Void>.Continuation?
    private(set) lazy var presses: AsyncStream<Void> = AsyncStream { continuation in
        configureContinuation(continuation)
    }

    deinit { continuation?.finish() }