Hi <@UHAJKUSTU> . ```private val navigation = StackNavigation&lt;Configuration&gt;()``` This in my n...

# decompose

[Shivam Kanodia]

Hi @Arkadii Ivanov .

private val navigation = StackNavigation<Configuration>()

This in my navigation stack. I want to know Configuration at top of stack or if navigation contains a particular Configuration. Consider a scenario , my navigation stack contains {A,B,C,D,E}. now on button click it pushes 'B' again it causes error "Uncaught Kotlin exception: kotlin.IllegalStateException: Configurations must be unique". TO solve this error i want to know if navigation contains this Config or not before psuhing.

I am ujsing "2.0.0-compose-experimental-alpha-02" as i am developing for ios

[Arkadii Ivanov]

You can check the navigation state.

private val _stack = childStack(...)
val stack: Value<ChildStack<*, Child>> = _stack

fun foo() {
    if (_stack.items.any { it.configuration is Config.Something }) { 
        ...
    }
}

[Arkadii Ivanov]

But your can also do it during the navigation:

navigation.navigate { stack ->
    // Check the current stack and return a new stack
}

[Arkadii Ivanov]

Or maybe some of the existing operators will work, e.g. bringToFront.

[Shivam Kanodia]

Thanks @Arkadii Ivanov 😀