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Adding namespaced environment variables to DefinePlugin under REACT_APP_

Merged Administrator requested to merge github/fork/eliperelman/custom-env-vars into master

Created by: eliperelman

This enables users to specify custom environment variables under a REACT_APP_* namespace. To verify it works, I ran the start script via:

REACT_APP_TITLE="Env-enabled React" npm start

And changed the <h2> in src/App.js:

<h2>Welcome to {process.env.REACT_APP_TITLE}</h2>

Which rendered:

screenshot