flutter textinputformatter is not working

Issue I want to implement textinputformatter in textformfield I tried code snippet from topic below to format incoming numeric text to fit the format of (###) ###-#### ##, but it’s not working (class _UsNumberTextInputFormatter extends TextInputFormatter) https://medium.com/@rubensdemelo/flutter-formatting-textfield-with-textinputformatter-6caba78668e5 Can you tell

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