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from_async

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.

Returns a new dict with each value awaited in parallel

namespace HH\Lib\Dict;

function from_async<Tk as arraykey, Tv>(
  KeyedTraversable<Tk, Awaitable<Tv>> $awaitables,
): Awaitable<dict<Tk, Tv>>;

Time complexity: O(n * a), where a is the complexity of the synchronous portions of each Awaitable Space complexity: O(n)

The IO operations for each Awaitable will happen in parallel.

Parameters​

Returns​