notes.js

// devDependencies in package.json:

    "require-reload": "0.2.2",
    "react-transform-hmr-no-accept": "1.0.1", // not published, get it here: https://github.com/brandonbloom/react-transform-hmr

// in babelrc:

 "env": {
      "development": {
        "plugins": [
          [
            "react-transform",
            {
              "transforms": [
                {
                  "transform": "react-transform-hmr-no-accept",
                  "imports": [
                    "react"
                  ],
                  "locals": [
                    "module"
                  ]
                }
              ]
            }
          ]
        ]
      }
    }

// in the Electron main thead:

fs.watch(__dirname + '/views', {recursive: true}, (event, filename) => {
  if (filename.endsWith('.js')) {
    mainWindow.webContents.send('reload', filename);
  }
});
  
  
// in the main window renderer thread:

import {ipcRenderer} from 'electron';

ipcRenderer.on('reload', (event, filename) => {
  reload('./views/' + filename);
});

Not much. 👍