wp-includes/class-wp-dependencies.php:339Get extra item data.
$handlestring$keystringmixed public function get_data( $handle, $key ) { if ( ! isset( $this->registered[ $handle ] ) ) { return false; } if ( ! isset( $this->registered[ $handle ]->extra[ $key ] ) ) { return false; } return $this->registered[ $handle ]->extra[ $key ]; }Introduced in 3.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-dependencies.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.