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

I too got this error on putting proptypes in wrong format:

static propTypes = {
  workHard: PropTypes.func.isRequired,
  winBig: PropTypes.shape({
    prize: { // issue
      PENDING: PropTypes.bool,
    },
  }),
};

Turns out, prop types are expected to be either of type PropTypes.shape or PropTypes.objectOf when it comes to declaring object props

So, error was fixed upon changing code to this:

static propTypes = {
  workHard: PropTypes.func.isRequired,
  winBig: PropTypes.shape({
    prize: PropTypes.shape({
      SUCCESS: PropTypes.bool,
    }),
  }),
};