How to merge two(multiple) liveData? How to combine two LiveData?

MergedLiveData.kt

import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LiveData
import androidx.lifecycle.Observer

class MergedLiveData<T1, T2>(
    private val liveData1: LiveData<T1>,
    private val liveData2: LiveData<T2>
) : LiveData<Pair<T1, T2>>() {

    private var value1: T1? = null
    private var value2: T2? = null

    private val observer1 = Observer<T1> {
        value1 = it
        invalidate()
    }

    private val observer2 = Observer<T2> {
        value2 = it
        invalidate()
    }

    override fun observe(owner: LifecycleOwner, observer: Observer<in Pair<T1, T2>>) {
        super.observe(owner, observer)

        liveData1.observe(owner, observer1)
        liveData2.observe(owner, observer2)
    }

    private fun invalidate() {
        if (value1 != null && value2 != null) {
            postValue(Pair(value1!!, value2!!))
        }
    }
}

MergedLiveDataUsage.kt

import com.example.livedata.MergedLiveData
// ...

fun someMethod(){
    MergedLiveData(someLiveData, anotherLiveData).observe(this, Observer {
        doSmthWithMultipleValues(it.first, it.second)
    })
}