type ValidationSchema = Record< string, { value?: any error?: string required?: boolean validate?: 'text' | 'number' | 'email' | 'phone' | 'zip' | 'checkbox' | 'select' minLength?: number maxLength?: number helperText?: string } > // src/initialValues.tsx const initialValues: ValidationSchema = { yourFieldname: { value: '', // will be filled with field value error: '', // will be filled with error message required: true, // if `false` field will be still validated but will not enable the `next` button validate: 'text', // field validation logic (see types above) minLength: 2, // validate min length maxLength: 20, // validate max length helperText: 'custom error message' // change the default error message (applied to `validate` types only) }, { // another field } }