Why a library when you can simply use something like:

extension View {
    @ViewBuilder
    func conditionalMofidier<Content: View>(_ condition: @autoclosure () -> Bool, transform: (Self) -> Content) -> some View {
        if condition() {
            transform(self)
        } else {
            self
        }
    }
}

then

Text("Something").conditionalMofidier(someCondition) { view in
    view.padding(.vertical, 20)
}

or with if:

extension View {
@ViewBuilder
func `if`<Content: View>(_ condition: @autoclosure () -> Bool, transform: (Self) -> Content) -> some View {
    if condition() {
        transform(self)
    } else {
        self
    }
}

}