1. Now we are using `envType` variable in definePlugin which sets environment variable NODE_ENV globally which is used by React to create development or production build.
where:
envType - determine build type is either `production` or `development` depending on the environment set in package.json > scripts.
2. In `UglifyJSPlugin`, i am setting compress > `warnings to false`, because here warning flag is meant to display warnings on terminal while creating build in production mode. so it is set to false.
I didn't created an RM for #2 as it is minor change, if needed, i will create.
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.
As discussed, you're setting 'production', even in the 'development' mode.
Please understand the code, and share the updated patch.
Also - share the references next time, so that - committer can understand the reason for these changes.
