Свойство oldValue

String oldValue

Источник

@DomName('StorageEvent.oldValue')
@DocsEditable()
String get oldValue =>
    _blink.BlinkStorageEvent.instance.oldValue_Getter_(this);

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/StorageEvent/oldValue.html