This is maybe a bug.

[samonxian]

�React Hot Loader work correctly,But after Hot-reload,it will has warning like below.

warning.js:36 Warning: setState(...): Can only update a mounted or mounting component.
This usually means you called setState() on an unmounted component. This is a no-op. 
Please check the code for the Component component.

Demo is here.,please see demo13.

[calesce]

Hi, I don't see react-hot-loader/patch anywhere in demo13. Try putting that in entry of your Webpack config.

[samonxian]

I put react-hot-loader/patch in the entry, but it's no use when using require.ensure.See Demo 13 again.

[calesce]

Ah yes, there's a known issue with require.ensure, see #288. The workaround is to add extra module.hot.accept callbacks for each separate module (which is annoying).

System.import may be a good alternative if you can use Webpack 2, see #303 (comment).

[penx]

I had this issue when trying to switch from babel-preset-es2015 to babel-preset-env. Adding transform-es2015-classes to the included transforms resolved it for me:

presets: [
  ['env', {
    targets: {
      chrome: 60
    },
    include: ['transform-es2015-classes']
  }],
  'stage-1',
  'react'
],
plugins: ['react-hot-loader/babel']