type_name

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.

Resolve a string into a classname that's properly capitalized and properly typed

namespace HH\Facts;

function type_name(
  string $classname,
): ?classname<nonnull>;

Return null if the classname does not exist in the codebase, even with different capitalization.

Throw InvalidOperationException if Facts is not enabled.

Parameters

• string $classname

Returns

• ?classname<nonnull>