Split the importer and the setup routine.

app/Import/Importer/ImporterInterface.php

@@ -10,9 +10,25 @@
 declare(strict_types = 1);
 
 namespace FireflyIII\Import\Importer;
+use FireflyIII\Models\ImportJob;
 
-
+/**
+ * Interface ImporterInterface
+ *
+ * @package FireflyIII\Import\Importer
+ */
 interface ImporterInterface
 {
+    /**
+     * Run the actual import
+     *
+     * @return bool
+     */
+    public function start(): bool;
 
+    /**
+     * @param ImportJob $job
+     *
+     */
+    public function setJob(ImportJob $job);
 }