Watchman Subscribe - Hhvm

:::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. :::

Hack

namespace HH;

function watchman_subscribe(
  string $json_query,
  string $path,
  string $sub_name,
  string $callback,
  ?string $socket_name = NULL,
): Awaitable<void>;

Parameters

string $json_query
string $path
string $sub_name
string $callback
?string $socket_name = NULL

Returns

Awaitable<void>