import { TextField } from '@aws-amplify/ui-react'; import * as React from 'react'; export const TextFieldValidationErrorExample = () => { const [hasError, setHasError] = React.useState(true); const validateUsername = (e) => { const containsDigit = /\d/.test(e.currentTarget.value); setHasError(!containsDigit); }; return ( <TextField label="Username" hasError={hasError} errorMessage="Username must include at least one digit" onChange={validateUsername} /> ); };