[Feature request] PropTypes: validate that no extra props has been passed

[mqklin]

Here is a stackoverflow question and sorta solution:

componentWillReceiveProps(nextProps) {
  const passedPropNames = Object.keys(nextProps);
  const expectedPropNames = Object.keys(MyComponent.propTypes);
  passedPropNames.forEach(propName => {
    if (!expectedPropNames.includes(propName)) {
      console.warn('Not expecting a property called', propName);
    }
  });
}

It's not working properly at least because there is no recursion, but I hope that the idea is clear.
It can be useful for example after refactoring and helps to eliminate death code, when some props are no longer needed.

[gaearon]

Thanks for the suggestion. This issue already exists: #1587.
Please feel free to contribute to the discussion there.