observableMacroExample4.swift

struct WeatherVMKey: EnvironmentKey {
    static var defaultValue = WeatherViewModel()
}

extension EnvironmentValues {
    var weatherVM: WeatherViewModel {
        get { self[WeatherVMKey.self] }
        set { self[WeatherVMKey.self] = newValue }
    }
}

struct WeatherView: View {
    @Environment(\.weatherVM) var weatherVM
    var body: some View {
       ...
    }
}