onWriteStart property
Stream<ProgressEvent> onWriteStartStream of writestart events handled by this FileWriter.
Source
@DomName('FileWriter.onwritestart')
@DocsEditable()
Stream<ProgressEvent> get onWriteStart => writeStartEvent.forTarget(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/FileWriter/onWriteStart.html