interface DeriverInterface

interface DeriverInterface {
    
    /**
     * Gets the definition of a derivative plugin.
     *
     * @param string $derivative_id
     *   The derivative id. The id must uniquely identify the derivative within a
     *   given base plugin, but derivative ids can be reused across base plugins.
     * @param array|\Drupal\Component\Plugin\Definition\PluginDefinitionInterface $base_plugin_definition
     *   The definition of the base plugin from which the derivative plugin
     *   is derived. It is maybe an entire object or just some array, depending
     *   on the discovery mechanism.
     *
     * @return array|null
     *   The full definition array of the derivative plugin, typically a merge of
     *   $base_plugin_definition with extra derivative-specific information. NULL
     *   if the derivative doesn't exist.
     */
    public function getDerivativeDefinition($derivative_id, $base_plugin_definition);
    
    /**
     * Gets the definition of all derivatives of a base plugin.
     *
     * @param array $base_plugin_definition
     *   The definition array of the base plugin.
     *
     * @return array
     *   An array of full derivative definitions keyed on derivative id.
     *
     * @see getDerivativeDefinition()
     */
    public function getDerivativeDefinitions($base_plugin_definition);

}