RxJava2 Single extension function to convert Google Play Service Task

GmsExtensions.kt

package com.example

import com.google.android.gms.tasks.Task
import io.reactivex.Single

fun <TResult> Task<TResult>.toSingle(): Single<TResult> =
    Single.create<TResult> { emitter ->
        addOnSuccessListener { result -> emitter.onSuccess(result) }
        addOnFailureListener { error -> emitter.onError(error) }
    }