I noticed we stopped providing it, but a bunch of fiddles for old bugs use it.
I wonder if we should add it back, e.g. as `react-dom-test-utils.development.js`.

Let’s hear what people have to say.
'use strict';
const bundleTypes = {
  UMD_DEV: 'UMD_DEV',
  UMD_PROD: 'UMD_PROD',
  NODE_DEV: 'NODE_DEV',
  NODE_PROD: 'NODE_PROD',
  FB_DEV: 'FB_DEV',
  FB_PROD: 'FB_PROD',
  RN_DEV: 'RN_DEV',
  RN_PROD: 'RN_PROD',
};
const UMD_DEV = bundleTypes.UMD_DEV;
const UMD_PROD = bundleTypes.UMD_PROD;
const NODE_DEV = bundleTypes.NODE_DEV;
const NODE_PROD = bundleTypes.NODE_PROD;
const FB_DEV = bundleTypes.FB_DEV;
const FB_PROD = bundleTypes.FB_PROD;
const RN_DEV = bundleTypes.RN_DEV;
const RN_PROD = bundleTypes.RN_PROD;
const moduleTypes = {
  ISOMORPHIC: 'ISOMORPHIC',
  RENDERER: 'RENDERER',
  RENDERER_UTILS: 'RENDERER_UTILS',
  RECONCILER: 'RECONCILER',
};
const ISOMORPHIC = moduleTypes.ISOMORPHIC;