hphp/hack/manual/hsl/Classes/HH.Lib.Async/Condition/index.md
:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::
A wrapper around ConditionWaitHandle that allows notification events to occur before the condition is awaited
namespace HH\Lib\Async;
class Condition {...}
->fail(\Exception $exception): void->succeed(T $result): void->waitForNotificationAsync(Awaitable<void> $notifiers): Awaitable<T>