interface IStepperProps extends WithTranslation {  
    isHeadless: boolean; 
    defaultStep: number;  
    isStepInvalid?: boolean;
    submitStep?: () => void;
}

class Stepper extends React.Component<IStepperProps, IStepperState> {
    static defaultProps: Partial<IStepperProps> = {
        isHeadless: true,
        defaultStep: 1,
    };
    
    (...)
} 

export default connect(mapStateToProps)(withTranslation()(Stepper));

<Stepper>…</Stepper>

TS2739: Type '{ children: any[]; }' is missing the following properties from type 'Readonly<Pick<Pick<IStepperProps, "isHeadless" | "isStepInvalid" | "submitStep" | "defaultStep"> & WithTranslationProps, "i18n" | ... 6 more ... | "useSuspense">>': isHeadless, defaultStep