Issue #3107156 by briantschu, heddn: Update function signature for batchProcessImport

src/MigrateBatchExecutable.php

@@ -80,10 +80,10 @@ class MigrateBatchExecutable extends BaseMigrateBatchExecutable {
    *   The migration id.
    * @param array $options
    *   The batch executable options.
-   * @param array $context
+   * @param array|\DrushBatchContext $context
    *   The sandbox context.
    */
-  public static function batchProcessImport($migration_id, array $options, array &$context) {
+  public static function batchProcessImport($migration_id, array $options, &$context) {
     if (empty($context['sandbox'])) {
       $context['finished'] = 0;
       $context['sandbox'] = [];