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join

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.

Wait for a given Awaitable to finish and return its result

namespace HH\Asio;

function join<T>(
  Awaitable<T> $awaitable,
): T;

Launches a new instance of scheduler to drive asynchronous execution until the provided Awaitable is finished.

Parameters​

Returns​

  • T