Fb Lazy Realpath

:::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. :::

Returns a canonicalized version of the input path that contains no symbolic links, like realpath(), except uses cached information from an internal inotify-based mechanism that may not be updated during the duration of a request

function fb_lazy_realpath(
  string $filename,
): mixed;

Parameters

• string $filename - Fake path to the file.

Returns

• string - - Real path of the file.