is it ok to use

continuation.isCompleted

i have used this and its working fine, is it ok ?

suspend fun <T> Task<T>.await(): T {
    return suspendCancellableCoroutine { continuation ->
        addOnSuccessListener {
            if (continuation.isCompleted.not())
                continuation.resume(it)
        }.addOnFailureListener {
            if (continuation.isCompleted.not())
                continuation.resumeWithException(it)
        }
    }
}

If this is the solution that you go for you could extract it into an extension function like

private fun <T> CancellableContinuation<T>.resumeOnlyOnce(value: T) {

if(!isCompleted) resume(value)

}

i'm not sure here if

isCompleted

working as i'm expecting, i have checked its not throwing an error, but i need confirmation for this

I think

isCompleted

doesn't indicate whether it was started reliably.

isCompleted

just informs you if it will no longer execute.

!isActive && !isCancelled && isCompleted

would both need to be checked that it was completed normally. You can figure out which combination(s) you need to check by referencing the states table on the Job docs https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-job/

I'm alluding to the ability to check if a continuation was already resumed. The best way might be to just try/catch