react debug component

devtools.js

var devtools = /./;
devtools.toString = function() {
  this.opened = true;
};

console.log("%c", devtools);

// devtools.opened will become true if/when the console is opened

export default props => {
  if (devtools.opened) {
    return props.children;
  }
  return null;
};

import Devtool from './devtools.js'

<Devtool><pre>{JSON.stringify(object, null, 2)}</pre></Devtool>