Because:

• package:ffcache/ffcache.dart that imports:
• package:path_provider/path_provider.dart that declares support for platforms: Android, iOS, Windows, Linux, macOS.

lib/ffcache.dart:9:8

  ╷
9 │ import 'package:idb_shim/idb_shim.dart';
  │        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  ╵

To reproduce make sure you are using the lints_core and run flutter analyze lib/ffcache.dart

lib/ffcache.dart:92:9

    ╷
92  │ ┌         try {
93  │ │           var txn = _db!.transaction(_basePath, idbModeReadOnly);
94  │ │           var store = txn.objectStore(_basePath);
95  │ │           var keys = await store.getAllKeys();
96  │ │           await txn.completed;
97  │ │ 
98  │ │           for (final keyObject in keys) {
99  │ │             final key = keyObject as String;
100 │ │             if (key == _ffcache_filename) {
101 │ │               continue;
102 │ │             }
103 │ │             if (remainingDurationForKey(key).isNegative) {
104 │ │               if (_debug) {
105 │ │                 print('  $key : delete');
106 │ │               }
    │ └─────────────^
    ╵

To reproduce make sure you are using the lints_core and run flutter analyze lib/ffcache.dart