Hi, I inspect the react code and in call stacks, found `process.env.NODE_ENV` is undefined due to which 'SyntheticEvent.call' is not callable.
So, to fix this, i add 'definePlugin' to plugins for `dev` environment in `webpack.config.js`. Initially it was added only for `production` environment. but it is needed for both, because React code is conditional based on environment variables set. Please find attached patch and review. Thanks, Surinder
RM_2596.patch
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