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diff --git a/vendor/drupal/console-core/src/Command/Yaml/MergeCommand.php b/vendor/drupal/console-core/src/Command/Yaml/MergeCommand.php
new file mode 100644
index 000000000..082509260
--- /dev/null
+++ b/vendor/drupal/console-core/src/Command/Yaml/MergeCommand.php
@@ -0,0 +1,201 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Console\Core\Command\Yaml\MergeCommand.
+ */
+
+namespace Drupal\Console\Core\Command\Yaml;
+
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Yaml\Dumper;
+use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Console\Command\Command;
+use Drupal\Console\Core\Command\Shared\CommandTrait;
+use Drupal\Console\Core\Style\DrupalStyle;
+
+class MergeCommand extends Command
+{
+    use CommandTrait;
+
+    protected function configure()
+    {
+        $this
+            ->setName('yaml:merge')
+            ->setDescription($this->trans('commands.yaml.merge.description'))
+            ->addArgument(
+                'yaml-destination',
+                InputArgument::REQUIRED,
+                $this->trans('commands.yaml.merge.arguments.yaml-destination')
+            )
+            ->addArgument(
+                'yaml-files',
+                InputArgument::IS_ARRAY,
+                $this->trans('commands.yaml.merge.arguments.yaml-files')
+            );
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new DrupalStyle($input, $output);
+
+        $yaml = new Parser();
+        $dumper = new Dumper();
+
+        $final_yaml = array();
+        $yaml_destination = realpath($input->getArgument('yaml-destination'));
+        $yaml_files = $input->getArgument('yaml-files');
+
+        if (count($yaml_files) < 2) {
+            $io->error($this->trans('commands.yaml.merge.messages.two-files-required'));
+
+            return;
+        }
+
+        foreach ($yaml_files as $yaml_file) {
+            try {
+                $yaml_parsed = $yaml->parse(file_get_contents($yaml_file));
+            } catch (\Exception $e) {
+                $io->error(
+                    sprintf(
+                        '%s: %s',
+                        $this->trans('commands.yaml.merge.messages.error-parsing'),
+                        $e->getMessage()
+                    )
+                );
+
+                return;
+            }
+
+            if (empty($yaml_parsed)) {
+                $io->error(
+                    sprintf(
+                        $this->trans('commands.yaml.merge.messages.wrong-parse'),
+                        $yaml_file
+                    )
+                );
+            }
+
+            // Merge arrays
+            $final_yaml = array_replace_recursive($final_yaml, $yaml_parsed);
+        }
+
+        try {
+            $yaml = $dumper->dump($final_yaml, 10);
+        } catch (\Exception $e) {
+            $io->error(
+                sprintf(
+                    '%s: %s',
+                    $this->trans('commands.yaml.merge.messages.error-generating'),
+                    $e->getMessage()
+                )
+            );
+
+            return;
+        }
+
+        try {
+            file_put_contents($yaml_destination, $yaml);
+        } catch (\Exception $e) {
+            $io->error(
+                sprintf(
+                    '%s: %s',
+                    $this->trans('commands.yaml.merge.messages.error-writing'),
+                    $e->getMessage()
+                )
+            );
+
+            return;
+        }
+
+        $io->success(
+            sprintf(
+                $this->trans('commands.yaml.merge.messages.merged'),
+                $yaml_destination
+            )
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function interact(InputInterface $input, OutputInterface $output)
+    {
+        $io = new DrupalStyle($input, $output);
+
+        $validator_filename = function ($value) use ($io) {
+            if (!strlen(trim($value)) || !is_file($value)) {
+                $io->error($this->trans('commands.common.errors.invalid-file-path'));
+
+                return false;
+            }
+
+            return $value;
+        };
+
+        // --yaml-destination option
+        $yaml_destination = $input->getArgument('yaml-destination');
+        if (!$yaml_destination) {
+            while (true) {
+                $yaml_destination = $io->ask(
+                    $this->trans('commands.yaml.merge.questions.yaml-destination'),
+                    '',
+                    $validator_filename
+                );
+
+                if ($yaml_destination) {
+                    break;
+                }
+            }
+
+            $input->setArgument('yaml-destination', $yaml_destination);
+        }
+
+        $yaml_files = $input->getArgument('yaml-files');
+        if (!$yaml_files) {
+            $yaml_files = array();
+
+            while (true) {
+                // Set the string key based on among files provided
+                if (count($yaml_files) >= 2) {
+                    $questionStringKey = 'commands.yaml.merge.questions.other-file';
+                } else {
+                    $questionStringKey = 'commands.yaml.merge.questions.file';
+                }
+
+                $yaml_file = $io->ask(
+                    $this->trans($questionStringKey),
+                    '',
+                    function ($file) use ($yaml_files, $io) {
+                        if (count($yaml_files) < 2 && empty($file)) {
+                            $io->error($this->trans('commands.yaml.merge.questions.invalid-file'));
+                            return false;
+                        } elseif (!empty($file) && in_array($file, $yaml_files)) {
+                            $io->error(
+                                sprintf($this->trans('commands.yaml.merge.questions.file-already-added'), $file)
+                            );
+
+                            return false;
+                        } elseif ($file == '') {
+                            return true;
+                        } else {
+                            return $file;
+                        }
+                    }
+                );
+
+                if ($yaml_file && !is_string($yaml_file)) {
+                    break;
+                }
+
+                if ($yaml_file) {
+                    $yaml_files[] = realpath($yaml_file);
+                }
+            }
+
+            $input->setArgument('yaml-files', $yaml_files);
+        }
+    }
+}