Wrong type for error prop in LayoutProps (typescript, ra-ui-materialui)

[NastyaLo]

What you were expecting:
I expect LayoutProps['error'] error prop to have type Error | undefined

export interface LayoutProps extends CoreLayoutProps, Omit<HtmlHTMLAttributes<HTMLDivElement>, 'title'> {
    appBar?: ComponentType<AppBarProps>;
    classes?: any;
    className?: string;
    error?: ComponentType<{
        error?: Error;
        errorInfo?: React.ErrorInfo;
        title?: string | ReactElement<any>;
    }>;
    menu?: ComponentType<MenuProps>;
    notification?: ComponentType;
    sidebar?: ComponentType<{
        children: JSX.Element;
    }>;
    theme?: ThemeOptions;
}

What happened instead:

react-admin/packages/ra-ui-materialui/src/layout/Layout.tsx

Line 189 in 8219644

error?: string;

Related code:
As we can see from render for error, error prop has type Error | undefined | null

react-admin/packages/ra-ui-materialui/src/layout/Layout.tsx

Line 99 in 8219644

this.setState({ hasError: true, errorMessage, errorInfo });

Environment

• React-admin version: 3.17.1
• React version: 17.0.2

[fzaninotto]

Reproduced, thanks for the report