Тип данных DatabaseCallback

@DomName('DatabaseCallback')
@Experimental()

void DatabaseCallback(SqlDatabase database)

Исходный код

@DomName('DatabaseCallback')
// http://www.w3.org/TR/webdatabase/#databasecallback
@Experimental() // deprecated
typedef void DatabaseCallback(SqlDatabase database);

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https://api.dartlang.org/stable/1.24.3/dart-html/DatabaseCallback.html