ref.child("users").child("").observeSingleEvent(of: .value, with: { (snapshot)
in  
// Get user value  
let value = snapshot.value as? NSDicitionary <===  
**Use of undeclared type 'NSDicitionary'と表示されます**

```

        let username = value?["username"] as? string ?? ""
        print(username)
    
```

エラーの解除方法を教えて戴けないでしょうか
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2018-02-11T03:41:05.807
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2018-02-11T03:41:05.807
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question
swift
swift4 NSDicitionaryの記述でUse of undeclared type 'NSDicitionary'とエラー表示される