Future<List<Entry>> readEntries() { var completer = new Completer<List<Entry>>(); _readEntries((value) { completer.complete(new List<Entry>.from(value)); }, (error) { completer.completeError(error); }); return completer.future; }
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https://api.dartlang.org/stable/2.0.0/dart-html/DirectoryReader/readEntries.html