How to use the react-admin.required function in react-admin

import { required as createRequiredValidator, number as createNumberValidator } from 'react-admin';

export const required = createRequiredValidator();
export const number = createNumberValidator();

import {
    required as createRequiredValidator,
    number as createNumberValidator,
} from 'react-admin';

export const required = createRequiredValidator();
export const number = createNumberValidator();

);

export const UsersList = props => (
  }>
    
      
      
      
      
      
    
  
);

const validateEmail = [required(), email()];
const validateRequired = required();

export const UserCreate = props => (
  
    
      
      
      
      
    
  
);

const UserEditTitle = ({ record }) =&gt; (<span>{`${record.firstname} ${record.lastname}`}</span>);

export const UserEdit = props =&gt; (
  }&gt;

return (
            
                }
                classes={{ form: classes.form }}
            >
                
                
            
        );
    }
}