use the JSMap name to make dropping this type easier in the future

@@ -10,11 +10,11 @@ import 'dart:js_interop';
 /// Object literals can be made using [jsify].
 @JS('Map')
 @staticInterop
-class JsMap<K extends JSAny, V extends JSAny> implements JSAny {
-  external factory JsMap();
+class JSMap<K extends JSAny, V extends JSAny> {
+  external factory JSMap();
 }
 
-extension JsMapExtension<K extends JSAny, V extends JSAny> on JsMap<K, V> {
+extension JSMapExtension<K extends JSAny, V extends JSAny> on JSMap<K, V> {
   external V? get(K key);
   external JSVoid set(K key, V? value);
 }

@@ -85,12 +85,12 @@ final class ZXingBarcodeReader extends BarcodeReader {
     }
   }
 
-  JsMap? _createReaderHints(List<BarcodeFormat> formats) {
+  JSMap? _createReaderHints(List<BarcodeFormat> formats) {
     if (formats.isEmpty || formats.contains(BarcodeFormat.all)) {
       return null;
     }
 
-    final JsMap hints = JsMap();
+    final JSMap hints = JSMap();
 
     // Set the formats hint.
     // See https://github.com/zxing-js/library/blob/master/src/core/DecodeHintType.ts#L45

@@ -16,7 +16,7 @@ class ZXingBrowserMultiFormatReader {
   ///
   /// See also: https://github.com/zxing-js/library/blob/master/src/core/DecodeHintType.ts
   external factory ZXingBrowserMultiFormatReader(
-    JsMap? hints,
+    JSMap? hints,
     JSNumber? timeBetweenScansMillis,
   );
 }