To take a type of properties from component

type Props = typeof MyComponent.defaultProps;

You can ask yourself why I'm taking typeof from defaultProps and not from propTypes. To explain that lets take a look at the definition file

  interface ComponentClass<P> {
        new(props?: P, context?: any): Component<P, ComponentState>;
        propTypes?: ValidationMap<P>;
        contextTypes?: ValidationMap<any>;
        childContextTypes?: ValidationMap<any>;
        defaultProps?: P;
        displayName?: string;
    }

As you can see propTypes are wrapped in ValidationMap and it's not easy to get raw types. Fortunately the defaultProps have raw types

To take a type of properties from component

type Props = typeof MyComponent.defaultProps;

You can ask yourself why I'm taking typeof from defaultProps and not from propTypes. To explain that lets take a look at the definition file

  interface ComponentClass<P> {
        new(props?: P, context?: any): Component<P, ComponentState>;
        propTypes?: ValidationMap<P>;
        contextTypes?: ValidationMap<any>;
        childContextTypes?: ValidationMap<any>;
        defaultProps?: P;
        displayName?: string;
    }

As you can see propTypes are wrapped in ValidationMap and it's not easy to get raw types. Fortunately, defaultProps have raw types