Consider ejecting from Create React App

[kellyi]

Overview

Following the initial/2.0 release, we should consider ejecting from Create React App. CRA's builtins are nice, but since we don't have access to the webpack configuration, we're unable to do a few things we typically do on our other projects, such as

• adding webpack-bundle-analyzer to see the composition of the app bundles
• setting up Rollbar using the webpack plugin in order to ship sourcemaps conditionally
• setting fine-grained polyfill configurations easily

In addition, we're prevented from adding an automatic code-formatter like prettier.

Describe the solution you'd like

I'm in favor of ejecting, but we should discuss it more after the initial/2.0 release.

One main thing we'd lose by ejecting is automatic upgrades to/via react-scripts, but we're familiar enough with upgrade paths and webpack configuration that it seems like that wouldn't be a huge loss.

[kellyi]

I set up react-app-rewired in #556 which enables adjusting the webpack config without ejecting from CRA. Closing this.