onUpgradeNeeded property

Stream<VersionChangeEvent> onUpgradeNeeded
@DocsEditable(), @DomName('IDBOpenDBRequest.onupgradeneeded')

Stream of upgradeneeded events handled by this OpenDBRequest.

Implementation 

@DomName('IDBOpenDBRequest.onupgradeneeded')
@DocsEditable()
Stream<VersionChangeEvent> get onUpgradeNeeded =>
    upgradeNeededEvent.forTarget(this);