@JSName('createWriter') Future<FileWriter> createWriter() { var completer = new Completer<FileWriter>(); _createWriter((value) { applyExtension('FileWriter', value); completer.complete(value); }, (error) { completer.completeError(error); }); return completer.future; }
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https://api.dartlang.org/stable/2.0.0/dart-html/FileEntry/createWriter.html