diff --git a/src/lib/extension/EntitiesTransporter.ts b/src/lib/extension/EntitiesTransporter.ts
index 790b4d0..a1c030e 100644
--- a/src/lib/extension/EntitiesTransporter.ts
+++ b/src/lib/extension/EntitiesTransporter.ts
@@ -1,5 +1,5 @@
 import {validateImportedEntity} from "$lib/extension/transporting/validators.js";
-import {exportEntityToObject} from "$lib/extension/transporting/exporters.js";
+import {exportEntityToObject} from "$lib/extension/transporting/exporters.ts";
 import StorageEntity from "$lib/extension/base/StorageEntity.ts";
 import {compressToEncodedURIComponent, decompressFromEncodedURIComponent} from "lz-string";
 
@@ -55,6 +55,10 @@ export default class EntitiesTransporter<EntityType> {
       throw new TypeError('Transporter should be connected to the same entity to export!');
     }
 
+    if (!(entityObject instanceof StorageEntity)) {
+      throw new TypeError('Only storage entities could be exported!');
+    }
+
     const exportableObject = exportEntityToObject(
       entityObject,
       this.#entityName
diff --git a/src/lib/extension/transporting/exporters.js b/src/lib/extension/transporting/exporters.js
deleted file mode 100644
index 87757f5..0000000
--- a/src/lib/extension/transporting/exporters.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * @type {Map<string, ((entity: import('../base/StorageEntity.ts').default) => Record<string, any>)>}
- */
-const entitiesExporters = new Map([
-  ['profiles', /** @param {import('../entities/MaintenanceProfile.ts').default} entity */entity => {
-    return {
-      v: 1,
-      id: entity.id,
-      name: entity.settings.name,
-      tags: entity.settings.tags,
-    }
-  }]
-])
-
-/**
- * @param entityInstance
- * @param {string} entityName
- * @returns {Record<string, *>}
- */
-export function exportEntityToObject(entityInstance, entityName) {
-  if (!entitiesExporters.has(entityName)) {
-    throw new Error(`Missing exporter for entity: ${entityName}`);
-  }
-
-  return entitiesExporters.get(entityName).call(null, entityInstance);
-}
diff --git a/src/lib/extension/transporting/exporters.ts b/src/lib/extension/transporting/exporters.ts
new file mode 100644
index 0000000..c2386c4
--- /dev/null
+++ b/src/lib/extension/transporting/exporters.ts
@@ -0,0 +1,24 @@
+import StorageEntity from "$lib/extension/base/StorageEntity.ts";
+
+type ExportersMap = {
+  [EntityName in keyof App.EntityNamesMap]: (entity: App.EntityNamesMap[EntityName]) => Record<string, any>
+};
+
+const entitiesExporters: ExportersMap = {
+  profiles: entity => {
+    return {
+      v: 1,
+      id: entity.id,
+      name: entity.settings.name,
+      tags: entity.settings.tags,
+    }
+  },
+};
+
+export function exportEntityToObject(entityInstance: StorageEntity<any>, entityName: string): Record<string, any> {
+  if (!(entityName in entitiesExporters) || !entitiesExporters.hasOwnProperty(entityName)) {
+    throw new Error(`Missing exporter for entity: ${entityName}`);
+  }
+
+  return entitiesExporters[entityName as keyof App.EntityNamesMap].call(null, entityInstance);
+}
diff --git a/src/lib/extension/transporting/validators.js b/src/lib/extension/transporting/validators.js
index cb41e3d..111c1be 100644
--- a/src/lib/extension/transporting/validators.js
+++ b/src/lib/extension/transporting/validators.js
@@ -1,6 +1,6 @@
 /**
  * Map of validators for each entity. Function should throw the error if validation failed.
- * @type {Map<string, ((importedObject: Object) => void)>}
+ * @type {Map<keyof App.EntityNamesMap|string, ((importedObject: Object) => void)>}
  */
 const entitiesValidators = new Map([
   ['profiles', importedObject => {
diff --git a/src/routes/features/maintenance/[id]/export/+page.svelte b/src/routes/features/maintenance/[id]/export/+page.svelte
index 9788c01..ea8e2a3 100644
--- a/src/routes/features/maintenance/[id]/export/+page.svelte
+++ b/src/routes/features/maintenance/[id]/export/+page.svelte
@@ -10,10 +10,6 @@
     import MaintenanceProfile from "$entities/MaintenanceProfile.ts";
 
     const profileId = $page.params.id;
-
-    /**
-     * @type {import('$entities/MaintenanceProfile.ts').default|undefined}
-     */
     const profile = $maintenanceProfilesStore.find(profile => profile.id === profileId);
 
     const profilesTransporter = new EntitiesTransporter(MaintenanceProfile);