app_for_reddit/Reddit App/Utilities/PremiumEnvironment.swift

import SwiftUI

private struct RequirePremiumAccessKey: EnvironmentKey {
    static let defaultValue: () -> Bool = { true }
}

extension EnvironmentValues {
    /// Returns `true` when the user has premium access. Otherwise presents the paywall and returns `false`.
    var requirePremiumAccess: () -> Bool {
        get { self[RequirePremiumAccessKey.self] }
        set { self[RequirePremiumAccessKey.self] = newValue }
    }
}