kotlinx-coroutines-core/kotlinx.coroutines/asDeferred

asDeferred

@ExperimentalCoroutinesApi
fun <T> CompletableDeferred<T>.asDeferred(): Deferred<T>(source)

Creates a view of this CompletableDeferred as a Deferred, which prevents downcasting to a completable version.

class MyClass(val scope: CoroutineScope) {
    // can be completed
    private val actualDeferred: CompletableDeferred<String> = CompletableDeferred()

    // can not be completed from outside
    public val operationCompleted: Deferred<String> = actualDeferred.asDeferred()

    fun startOperation() = scope.launch {
        // do some work
        delay(2.seconds)
        actualDeferred.complete("Done")
    }
}

// (myClass.operationCompleted as CompletableDeferred<*>) will fail
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fun <T : JsAny?> Promise<T>.asDeferred(): Deferred<T>(source)

Converts this promise value to the instance of Deferred.