wp_register_ability_category( string $slug, array $args ): WP_Ability_Category|null

645function wp_register_ability_category( string $slug, array $args ): ?WP_Ability_Category {646	if ( ! doing_action( 'wp_abilities_api_categories_init' ) ) {647		_doing_it_wrong(648			__FUNCTION__,649			sprintf(650				/* translators: 1: wp_abilities_api_categories_init, 2: ability category slug. */651				__( 'Ability categories must be registered on the %1$s action. The ability category %2$s was not registered.' ),652				'<code>wp_abilities_api_categories_init</code>',653				'<code>' . esc_html( $slug ) . '</code>'654			),655			'6.9.0'656		);657		return null;658	}659 660	$registry = WP_Ability_Categories_Registry::get_instance();661	if ( null === $registry ) {662		return null;663	}664 665	return $registry->register( $slug, $args );666}