React: checker is not a function

Question

I\'m getting this weird warning message in the console for my React app.

Warning: Failed propType: checker is not a function Check the render method of <

Answer 1

In my case, I was validating props wrong. I forgot to wrap the profile object into PropTypes shape method.

Mistake

Component.propTypes = {
  viewProfile: PropTypes.shape({
    profile: {     // it is a normal object without a PropTypes shape method
      firstName: PropTypes.string,
      lastName: PropTypes.string,
      profileImage: PropTypes.string,
    },
  }).isRequired,
};

Solution

Component.propTypes = {
  viewProfile: PropTypes.shape({
    profile: PropTypes.shape({
      firstName: PropTypes.string,
      lastName: PropTypes.string,
      profileImage: PropTypes.string,
    }),
  }).isRequired,
};