Problems updating to React 15.4.0

[albertolive]

I'm getting this error with in all my files:

Module not found: Error: Cannot resolve module 'react/lib/ReactMount' in...

I'm using the latest version of react: 15.4.0.

webpack: 1.12.11

Any help?

[gaearon]

Hi, thanks for the report.

You need to find the library that imports react/lib/ReactMount and file an issue with it.
This was never officially supported, as noted in the release notes:

However, there is a possibility that you imported private APIs from react/lib/*, or that a package you rely on might use them. We would like to remind you that this was never supported, and that your apps should not rely on internal APIs. The React internals will keep changing as we work to make React better.

We warned about this change a month ago so most libraries that reached into the internal APIs could be updated.

This issue is not actionable for us so I will close it. Webpack should print the name of the module that tried to import react/lib/ReactMount, so you should be able to tell which library's fault it is. Then you can file an issue with it.

As a temporary fix that library could start importing react-dom/lib/ReactMount instead, but this is also guaranteed to break in the future. We never supported, and will not support reaching into internal modules.

[hhope1271]

We never supported, and will not support reaching into internal modules.

@gaearon From what I can tell, that require is coming from react-hot-loader v1.3.0, which is the latest non-beta release according to: https://github.com/gaearon/react-hot-loader/releases.

prependText = [
    '/* REACT HOT LOADER */',
    'if (module.hot) {',
      '(function () {',
        'var ReactHotAPI = require(' + JSON.stringify(require.resolve('react-hot-api')) + '),',
            'RootInstanceProvider = require(' + JSON.stringify(require.resolve('./RootInstanceProvider')) + '),',
            'ReactMount = require("react/lib/ReactMount"),',
            'React = require("react");',

        'module.makeHot = module.hot.data ? module.hot.data.makeHot : ReactHotAPI(function () {',
          'return RootInstanceProvider.getRootInstances(ReactMount);',
        '}, React);',
      '})();',
    '}',
    'try {',
      '(function () {',
  ].join(' ');

[gaearon]

React Hot Loader 1.x has been unsupported for about a year by now. Please use 3.x which should work without reaching into internal modules.

[hhope1271]

Hey @gaearon , fair enough. Thanks! Might be off-topic, but will there be an official stable release of 3.x in the near future? To be fair I did miss the documentation where it mentioned the requirement to use 3.x, but it still feels a bit unintuitive to be forced to use a pre-release/beta version.

[gaearon]

Please reach out to project maintainers about this. I can't say because I'm not actively involved right now.