I am writing a simple component in ES6 (with BabelJS), and functions this.setState is not working. Typical errors include something like Cannot read property 'setState' of undefined or this.setState is not a function Do you know why? Here is the code: import React from 'react' class SomeClass extends React.Component { constructor(props) { super(props) this.state = {inputContent: 'startValue'} } se