format barcode reader base

@@ -42,7 +42,8 @@ abstract class BarcodeReader {
 
     final Completer<void> completer = Completer();
 
-    final HTMLScriptElement script = (document.createElement('script') as HTMLScriptElement)
+    final HTMLScriptElement script =
+        (document.createElement('script') as HTMLScriptElement)
           ..id = scriptId
           ..async = true
           ..defer = false
@@ -65,7 +66,8 @@ abstract class BarcodeReader {
           const MobileScannerException(
             errorCode: MobileScannerErrorCode.genericError,
             errorDetails: MobileScannerErrorDetails(
-              message: 'Could not load the BarcodeReader script due to a network error.',
+              message:
+                  'Could not load the BarcodeReader script due to a network error.',
             ),
           ),
         );
@@ -81,7 +83,10 @@ abstract class BarcodeReader {
   ///
   /// The [options] are used to configure the barcode reader.
   /// The [containerElement] will become the parent of the video output element.
-  Future<void> start(StartOptions options, {required HTMLElement containerElement}) {
+  Future<void> start(
+    StartOptions options, {
+    required HTMLElement containerElement,
+  }) {
     throw UnimplementedError('start() has not been implemented.');
   }