WP_Scripts::get_highest_fetchpriority_with_dependents( string $handle,  $checked = array(),  $stored_results = array() ): string|null

Source

private function get_highest_fetchpriority_with_dependents( string $handle, array $checked = array(), array &$stored_results = array() ): ?string {
	if ( isset( $stored_results[ $handle ] ) ) {
		return $stored_results[ $handle ];
	}

	// If there is a recursive dependency, return early.
	if ( isset( $checked[ $handle ] ) ) {
		return null;
	}

	// Mark this handle as checked to guard against infinite recursion.
	$checked[ $handle ] = true;

	// Abort if the script is not enqueued or a dependency of an enqueued script.
	if ( ! $this->query( $handle, 'enqueued' ) ) {
		return null;
	}

	$fetchpriority = $this->get_data( $handle, 'fetchpriority' );
	if ( ! $this->is_valid_fetchpriority( $fetchpriority ) ) {
		$fetchpriority = 'auto';
	}

	static $priorities   = array(
		'low',
		'auto',
		'high',
	);
	$high_priority_index = count( $priorities ) - 1;

	$highest_priority_index = (int) array_search( $fetchpriority, $priorities, true );
	if ( $highest_priority_index !== $high_priority_index ) {
		foreach ( $this->get_dependents( $handle ) as $dependent_handle ) {
			$dependent_priority = $this->get_highest_fetchpriority_with_dependents( $dependent_handle, $checked, $stored_results );
			if ( is_string( $dependent_priority ) ) {
				$highest_priority_index = max(
					$highest_priority_index,
					(int) array_search( $dependent_priority, $priorities, true )
				);
				if ( $highest_priority_index === $high_priority_index ) {
					break;
				}
			}
		}
	}
	$stored_results[ $handle ] = $priorities[ $highest_priority_index ]; // @phpstan-ignore parameterByRef.type (We know the index is valid and that this will be a string.)
	return $priorities[ $highest_priority_index ];
}

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