Autoload Is Native

:::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 true if we're using a native autoloader

namespace HH;

function autoload_is_native(): bool;

If we are using a native autoloader, all symbols will be loaded from the first line, and there's no need to call autoload_set_paths.

If you do call autoload_set_paths while natively autoloading, you'll disable the native autoloader in favor of your userland autoloader.

HH\autoload_is_native(); // true
HH\autoload_set_paths(darray['class' => darray[]]); // true
HH\autoload_is_native(); // false

Returns

• bool