Kind

:::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. :::

Return a string enum representing whether the given type is, for example, a class, interface, or trait

namespace HH\Facts;

function kind(
  classname<mixed> $type,
): ?TypeKind;

If the given type doesn't have a unique definition or isn't a classname<mixed>, return null.

Parameters

• classname<mixed> $type

Returns

• ?TypeKind