wp-admin/includes/class-wp-filesystem-direct.php:470Checks if resource is a directory.
$pathstringbool public function is_dir( $path ) { return @is_dir( $path ); }Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-filesystem-direct.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.