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supertypes

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.

Get all types which the given type extends, implements, or uses

namespace HH\Facts;

function supertypes(
  classname<mixed> $derived_type,
  ?DeriveFilters<string, dynamic> $filters = NULL,
): vec<string, classname<mixed>>;

Throws InvalidOperationException if Facts is not enabled.

Parameters​

  • classname<mixed> $derived_type
  • ?DeriveFilters<string, dynamic> $filters = NULL

Returns​

  • vec<string, classname<mixed>>