Error : Component [ComponentName] declared `PropTypes` instead of `propTypes`. Did you misspell the property assignment?

Question

Someone can explain why I get this error when I import PropTypes :

Component CustomBackground declared PropTypes instead of propTypes. Did you misspell the property assignment?

CustomBackground.js :

import PropTypes from 'prop-types';


const CustomBackground=({children})=>(
    <ImageBackground source={background} style={styles.imagebackground}>
        {children}
    </ImageBackground>
)

CustomBackground.PropTypes={
    children:PropTypes.element.isRequired,
}

export default CustomBackground;

Answer 1

You should use camelCase instead of TitleCase when defining propTypes.

Do this:

CustomBackground.propTypes = {...}

instead of

CustomBackground.PropTypes = {...}