Added babel plugins to support latest TS functionalities

src/servers/services/ServersImporter.ts

@@ -0,0 +1,26 @@
+import { CsvJson } from 'csvjson';
+import { RegularServer } from '../data';
+
+const CSV_MIME_TYPE = 'text/csv';
+
+export default class ServersImporter {
+  public constructor(private readonly csvjson: CsvJson, private readonly fileReaderFactory: () => FileReader) {}
+
+  public importServersFromFile = async (file?: File): Promise<RegularServer[]> => {
+    if (!file || file.type !== CSV_MIME_TYPE) {
+      throw new Error('No file provided or file is not a CSV');
+    }
+
+    const reader = this.fileReaderFactory();
+
+    return new Promise((resolve) => {
+      reader.addEventListener('loadend', (e: ProgressEvent<FileReader>) => {
+        const content = e.target?.result?.toString() ?? '';
+        const servers = this.csvjson.toObject<RegularServer>(content);
+
+        resolve(servers);
+      });
+      reader.readAsText(file);
+    });
+  };
+}