class MigrateField

class MigrateField extends Plugin {
    
    /**
     * {@inheritdoc}
     */
    public function __construct($values) {
        parent::__construct($values);
        // Provide default value for core property, in case it's missing.
        if (empty($this->definition['core'])) {
            $this->definition['core'] = [
                6,
            ];
        }
    }
    
    /**
     * The plugin ID.
     *
     * @var string
     */
    public $id;
    
    /**
     * Map of D6 and D7 field types to D8 field type plugin IDs.
     *
     * @var string[]
     */
    public $type_map = [];
    
    /**
     * The Drupal core version(s) this plugin applies to.
     *
     * @var int[]
     */
    public $core;
    
    /**
     * Identifies the system providing the data the field plugin will read.
     *
     * The source_module is expected to be the name of a Drupal module that must
     * be installed in the source database.
     *
     * @var string
     */
    public $source_module;
    
    /**
     * Identifies the system handling the data the destination plugin will write.
     *
     * The destination_module is expected to be the name of a Drupal module on the
     * destination site that must be installed.
     *
     * @var string
     */
    public $destination_module;
    
    /**
     * The weight of this plugin relative to other plugins.
     *
     * The weight of this plugin relative to other plugins servicing the same
     * field type and core version.  The lowest weighted applicable plugin will be
     * used for each field.
     *
     * @var int
     */
    public $weight = 0;

}