Function updater

app/src/static/js/react-bootstrap.js:7999–8002

(prevState)

  // Call this.constructor.gDSFP to support sub-classes.
  // Use the setState() updater to ensure state isn't stale in certain edge cases.
  function updater(prevState) {
    var state = this.constructor.getDerivedStateFromProps(nextProps, prevState);
    return state !== null && state !== undefined ? state : null;
  } // Binding "this" is important for shallow renderer support.


  this.setState(updater.bind(this));