Lots of new code for new importer routine.

app/Import/Importer/OldImporterInterface.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * ImporterInterface.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * See the LICENSE file for details.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Import\Importer;
+
+use FireflyIII\Models\ImportJob;
+use Illuminate\Support\Collection;
+
+/**
+ * Interface ImporterInterface
+ *
+ * @package FireflyIII\Import\Importer
+ */
+interface ImporterInterface
+{
+    /**
+     * Run the actual import
+     *
+     * @return Collection
+     */
+    public function createImportEntries(): Collection;
+
+    /**
+     * @param ImportJob $job
+     *
+     */
+    public function setJob(ImportJob $job);
+}