persistentStorage property Null safety

DeprecatedStorageQuota? persistentStorage
@JSName('webkitPersistentStorage'), @SupportedBrowser(SupportedBrowser.CHROME), @SupportedBrowser(SupportedBrowser.SAFARI)

Implementation

@JSName('webkitPersistentStorage')
@SupportedBrowser(SupportedBrowser.CHROME)
@SupportedBrowser(SupportedBrowser.SAFARI)
DeprecatedStorageQuota? get persistentStorage native;