This package is copied from RN Core. Hot Module Reloading offers an extremely improved developer experience, but does not typically work with React.PureComponent. If you use this preset instead of the real one, and also switch out React.PureComponent with React.Component only when module.hot is true, then HMR can work with pure components. This affects performance, but allows for HMR to work on all components in our codebase, which is a net win. In order to do this, however, we need to tell react-transform to run on PureComponent as well. Although this is a configuration option, the way the plugin is used inside of metro-bundler does not allow for us to pass in this configuration option. As a result, we are duplicating this here and resolving the module to this file path instead.