diff --git a/flutter_cache_manager/example/lib/main.dart b/flutter_cache_manager/example/lib/main.dart
index e2a655d3..05a7c185 100644
--- a/flutter_cache_manager/example/lib/main.dart
+++ b/flutter_cache_manager/example/lib/main.dart
@@ -2,7 +2,6 @@ import 'package:baseflow_plugin_template/baseflow_plugin_template.dart';
 import 'package:example/plugin_example/download_page.dart';
 import 'package:example/plugin_example/floating_action_button.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 
 void main() {
diff --git a/flutter_cache_manager/lib/src/cache_manager.dart b/flutter_cache_manager/lib/src/cache_manager.dart
index 10529cd0..6d85e40d 100644
--- a/flutter_cache_manager/lib/src/cache_manager.dart
+++ b/flutter_cache_manager/lib/src/cache_manager.dart
@@ -4,18 +4,11 @@ import 'dart:typed_data';
 import 'package:file/file.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
-import 'package:flutter_cache_manager/src/cache_managers/base_cache_manager.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/logger.dart';
-import 'package:flutter_cache_manager/src/result/download_progress.dart';
-import 'package:flutter_cache_manager/src/result/file_info.dart';
-import 'package:flutter_cache_manager/src/result/file_response.dart';
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
 import 'package:flutter_cache_manager/src/web/web_helper.dart';
 import 'package:uuid/uuid.dart';
 
-import 'config/config.dart';
-
 ///Flutter Cache Manager
 ///Copyright (c) 2019 Rene Floor
 ///Released under MIT License.
diff --git a/flutter_cache_manager/lib/src/cache_managers/default_cache_manager.dart b/flutter_cache_manager/lib/src/cache_managers/default_cache_manager.dart
index e0006fce..17e34e63 100644
--- a/flutter_cache_manager/lib/src/cache_managers/default_cache_manager.dart
+++ b/flutter_cache_manager/lib/src/cache_managers/default_cache_manager.dart
@@ -1,7 +1,4 @@
-import 'package:flutter_cache_manager/src/cache_managers/image_cache_manager.dart';
-
 import '../../flutter_cache_manager.dart';
-import '../config/config.dart';
 
 /// The DefaultCacheManager that can be easily used directly. The code of
 /// this implementation can be used as inspiration for more complex cache
diff --git a/flutter_cache_manager/lib/src/cache_store.dart b/flutter_cache_manager/lib/src/cache_store.dart
index 930cecc7..295b516e 100644
--- a/flutter_cache_manager/lib/src/cache_store.dart
+++ b/flutter_cache_manager/lib/src/cache_store.dart
@@ -1,12 +1,8 @@
 import 'dart:async';
 
-import 'package:flutter_cache_manager/src/config/config.dart';
 import 'package:flutter_cache_manager/src/storage/file_system/file_system.dart';
 
 import '../flutter_cache_manager.dart';
-import 'logger.dart';
-import 'result/file_info.dart';
-import 'storage/cache_info_repositories/cache_info_repository.dart';
 import 'storage/cache_object.dart';
 
 ///Flutter Cache Manager
diff --git a/flutter_cache_manager/lib/src/compat/file_service_compat.dart b/flutter_cache_manager/lib/src/compat/file_service_compat.dart
index 21bb27e6..874da63f 100644
--- a/flutter_cache_manager/lib/src/compat/file_service_compat.dart
+++ b/flutter_cache_manager/lib/src/compat/file_service_compat.dart
@@ -1,7 +1,6 @@
 import 'dart:io';
 
 import 'package:clock/clock.dart';
-import 'package:flutter_cache_manager/src/compat/file_fetcher.dart';
 
 import '../../flutter_cache_manager.dart';
 import '../web/mime_converter.dart';
diff --git a/flutter_cache_manager/lib/src/config/_config_io.dart b/flutter_cache_manager/lib/src/config/_config_io.dart
index 44d18ccb..1084572f 100644
--- a/flutter_cache_manager/lib/src/config/_config_io.dart
+++ b/flutter_cache_manager/lib/src/config/_config_io.dart
@@ -1,9 +1,6 @@
 import 'dart:io';
 
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
-import 'package:flutter_cache_manager/src/storage/cache_info_repositories/cache_info_repository.dart';
-import 'package:flutter_cache_manager/src/storage/cache_info_repositories/cache_object_provider.dart';
-import 'package:flutter_cache_manager/src/storage/cache_info_repositories/json_cache_info_repository.dart';
 import 'package:flutter_cache_manager/src/storage/file_system/file_system.dart';
 import 'package:flutter_cache_manager/src/storage/file_system/file_system_io.dart';
 
diff --git a/flutter_cache_manager/lib/src/config/config.dart b/flutter_cache_manager/lib/src/config/config.dart
index 55320ab9..655ead43 100644
--- a/flutter_cache_manager/lib/src/config/config.dart
+++ b/flutter_cache_manager/lib/src/config/config.dart
@@ -1,5 +1,4 @@
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
-import 'package:flutter_cache_manager/src/storage/cache_info_repositories/cache_info_repository.dart';
 import 'package:flutter_cache_manager/src/storage/file_system/file_system.dart';
 
 import '_config_unsupported.dart'
diff --git a/flutter_cache_manager/lib/src/web/mime_converter.dart b/flutter_cache_manager/lib/src/web/mime_converter.dart
index 0f149818..2c6ca1a4 100644
--- a/flutter_cache_manager/lib/src/web/mime_converter.dart
+++ b/flutter_cache_manager/lib/src/web/mime_converter.dart
@@ -54,6 +54,8 @@ const mimeTypes = {
   'audio/aac': '.aac',
   'audio/x-aac': '.aac',
   'audio/midi audio/x-midi': '.midi',
+  'audio/x-m4a': '.m4a',
+  'audio/m4a': '.m4a',
   'audio/mpeg': '.mp3',
   'audio/ogg': '.oga',
   'audio/opus': '.opus',
diff --git a/flutter_cache_manager/lib/src/web/web_helper.dart b/flutter_cache_manager/lib/src/web/web_helper.dart
index f973905a..e7e0ef37 100644
--- a/flutter_cache_manager/lib/src/web/web_helper.dart
+++ b/flutter_cache_manager/lib/src/web/web_helper.dart
@@ -3,20 +3,14 @@ import 'dart:collection';
 import 'dart:io';
 
 import 'package:clock/clock.dart';
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/result/file_info.dart';
-import 'package:flutter_cache_manager/src/result/file_response.dart';
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
-import 'package:flutter_cache_manager/src/web/file_service.dart';
 import 'package:flutter_cache_manager/src/web/queue_item.dart';
 import 'package:rxdart/rxdart.dart';
 import 'package:uuid/uuid.dart';
 
-import '../logger.dart';
-
 ///Flutter Cache Manager
 ///Copyright (c) 2019 Rene Floor
 ///Released under MIT License.
diff --git a/flutter_cache_manager/test/cache_manager_test.dart b/flutter_cache_manager/test/cache_manager_test.dart
index fd18ec7b..85f5f50b 100644
--- a/flutter_cache_manager/test/cache_manager_test.dart
+++ b/flutter_cache_manager/test/cache_manager_test.dart
@@ -4,9 +4,7 @@ import 'dart:typed_data';
 import 'package:clock/clock.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
-import 'package:flutter_cache_manager/src/cache_managers/image_cache_manager.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/config/config.dart';
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
 import 'package:flutter_cache_manager/src/web/web_helper.dart';
 import 'package:flutter_test/flutter_test.dart';
diff --git a/flutter_cache_manager/test/web_helper_test.dart b/flutter_cache_manager/test/web_helper_test.dart
index dc59e510..45bb777d 100644
--- a/flutter_cache_manager/test/web_helper_test.dart
+++ b/flutter_cache_manager/test/web_helper_test.dart
@@ -3,7 +3,6 @@ import 'dart:async';
 import 'package:clock/clock.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:flutter_cache_manager/src/cache_store.dart';
-import 'package:flutter_cache_manager/src/config/config.dart';
 import 'package:flutter_cache_manager/src/storage/cache_object.dart';
 import 'package:flutter_cache_manager/src/web/web_helper.dart';
 import 'package:flutter_test/flutter_test.dart';