New Rule Proposal: Disallow Undefined Methods

[elicwhite]

A component like this:

var React = require('react');

var MyComponent = React.createClass({
  render: function() {
    return <span onClick={this.handleClick}>Span</span>;
  }
});

module.exports = MyComponent;

Should complain because the component doesn't have a handleClick function.

[lencioni]

I wonder if a more general rule for this could be written.