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General cleanup after the [Jest 24 PR](#6278).
This also includes `jsdom@14` via https://www.npmjs.com/package/jest-environment-jsdom-fourteen. Since we have a node >= 8.10 requirement, we are able to use the latest version of `jsdom` which includes additional implementations of browser APIs such as `MutationObserver` (which we had an issue filed for over at #6617).
/cc @SimenB. Is there more you recommend we do to cleanup our [Jest config](b0cbf2caa1/packages/react-scripts/scripts/utils/createJestConfig.js) for TypeScript?
Co-authored-by: Ian Sutherland <ian@iansutherland.ca>
react-error-overlay
react-error-overlay is an overlay which displays when there is a runtime error.
Development
When developing within this package, make sure you run npm start (or yarn start) so that the files are compiled as you work.
This is run in watch mode by default.
If you would like to build this for production, run npm run build:prod (or yarn build:prod).
If you would like to build this one-off for development, you can run NODE_ENV=development npm run build (or NODE_ENV=development yarn build).