Closes #4932, Closes #4876

* No lock files prevents the use of yarn upgrade & outdated

* Update deps

* Bump Jest across the board

* Add safe postcss parser

Uglify is no longer maintained and has bugs not present in Terser (its successor)

* Update jest version

* Update babel-jest version

* Use testURL: http://localhost in jest configs.

* Update to jest version 23.5

This version of jest includes a fix for https://github.com/jsdom/jsdom/issues/2304

* "testURL": "http://localhost" is default with jest v23.5

- [x] Utilize webpack 4 development and production modes
- [x] Upgrade webpack dev server
- [x] Webpack 4 compatible release of thread-loader
- [x] Webpack 4 compatible release of HtmlWebpackPlugin
- [x] Webpack 4 compatible release of SwPrecacheWebpackPlugin
- [x] Webpack 4 compatible release of WebpackManifestPlugin
- [x] Update README
- [x] Update WebpackDevServerUtils
- [x] Update InterpolateHtmlPlugin
- [x] Update ModuleScopePlugin
- [x] Update WatchMissingNodeModulesPlugin
- [x] Move UglifyJS options to webpack 4 optimize
- [x] Move InterpolateHtmlPlugin to make it tapable on HtmlWebpackPlugin
- [x] vendor splitting via splitChunks.splitChunks (https://twitter.com/wSokra/status/969633336732905474)
- [x] long term caching via splitChunks.runtimeChunk (https://twitter.com/wSokra/status/969679223278505985)
- [x] Make sure process.env.NODE_ENV is proxied correctly to `react-error-overlay`
- [x] Implicit webpack.NamedModulesPlugin in dev config as its default in webpack 4
- [x] Disable webpack performance hints as we have our own filesize reporter
- [x] Replace ExtractTextPlugin with MiniCssExtractPlugin
- [x] Switch to css whole file minification via OptimizeCSSAssetsPlugin rather than per module css minification to gain performance

* Updated jest version.

* Add explicit dep on plugin-proposal-object-rest-spread to babel-preset-react-app

* Bump babel-related deps to beta.42

* Pass useBuiltIns directly to react-preset

* Try to fix CI

* Bump Jest elsewhere

* Bump Babel elsewhere

* Fix CI on Windows by writing .cmd file back

* Bump dependencies

* Use a more sensible way to compile error overlay

* Keep old chalk for global CLI

* Bump eslint-plugin-jsx-a11y

* Update index.js

* Update index.js

* Update package.json

* Don't use links for non-linky things

* Update dependencies in react-scripts

* Add first pass of working dependencies for babel-preset-react-app and react-scripts

* Bump more dependency versions

* Adjust more versions and edit fix options

* Restore functionality of old preset

* Disable Uglify in iframe webpack

* Apply prettier

* Re-enable cache in dev and clean deps

* Lock packages and move babel/core to dep in preset

* Bump babel-jest

* Re-enable uglify

* Nest forceAllTransforms correctly in webpack config

* Install babel-core bridge for jest

* Add jest-cli and babel-core bridge to make tests in react-error-overlay pass

* Re-enable transform-dynamic-import

* Add dynamic import syntax support back

* Use new babel in kitchensink

* Transform modules in test

* Revert "Transform modules in test"

This reverts commit 539e46a1.

* Attempt fix for ejected tests

* try this

* Add regenerator back

* Bump babel deps to beta.34

* Remove bad files

* Use default when requiring babel transform plugin

* Bump deps

* Try the fix?

* Oopsie

* Remove some weird things

* Run Babel on react-error-overlay tests

* Try fixing kitchensink

* Use new API for codeFrame

* Add missing (?) babelrc

* Maybe this helps?

* Maybe fix mocha

* I shouldn't have deleted this 

* update jest to 21.0.2 to support watchPathIgnorePatterns configuration

* update jest to 21.1.0

* Try bumping Jest

* Bump babel-jest

* Try to debug weird CI failure

* Remove debug code

* Bump other Jest packages

* ffs

* temp

* Revert "temp"

This reverts commit 62aec9ac.

 - babel-preset-react-app@3.1.1
 - create-react-app@1.5.0
 - eslint-config-react-app@2.1.0
 - react-dev-utils@5.0.0
 - react-error-overlay@4.0.0
 - react-scripts@1.1.0

* Switch to Yarn Workspaces

* Feedback

* Move flowconfig

* Use publish script

* Keep git status check

* Fix Flow without perf penalty

* Remove Flow from package.json "test"

* Try running it from script directly (?)

* Try magic incantations

* lol flow COME ON

* Try to skip Flow on AppVeyor

* -df

* -df

* -df

* Try to fix CI

* Revert unrelated changes

* Update CONTRIBUTING.md

 - babel-preset-react-app@3.1.0
 - react-dev-utils@4.2.0
 - react-error-overlay@3.0.0
 - react-scripts@1.0.15

* Bump dependencies

* Downgrade source-map back to 0.5.x

Not sure what changed there but our bundle snapshot doesn't match with minor changes.
I couldn't figure out how to update it, and also whether we need to tweak getPrettyURL in response.

* Use production React version

* We cannot strip our own checks if production

* Keep the sourcemap during minify

* Prevent devtools pollution

* Add some comments

* sigh

* `react-error-overlay` has no dependencies now (it's bundled)

* Use babel 6 for now

* Make error overlay to run in the context of the iframe

* Configure webpack to build the entire package

* Remove inline raw-loader config

* Configure watch mode for error-overlay webpack build

* Add polyfills to the error-overlay iframe script

* Add header comment

* Configure to fail CI on error or warning

* Suppress flow-type error on importing iframe-bundle

* Change webpack to a dev dependency and pin some versions

* Disable webpack cache

* Update license headers to MIT

 - babel-preset-react-app@3.0.3
 - create-react-app@1.4.1
 - eslint-config-react-app@2.0.1
 - react-dev-utils@4.1.0
 - react-error-overlay@2.0.2
 - react-scripts@1.0.14

* File headers BSD+Patents -> MIT

* BSD+Patents -> MIT

* Updated react-error-overlay to latest Flow (0.54.0)

* Revert "Updated react-error-overlay to latest Flow (0.54.0)"

This reverts commit 6deaffbd.

* Fixed unit tests.

* Updated code as per code review.

* Fixed code as per code review.

* Updated the code as per review.

* Clean target directory before compiling overlay

* Use rimraf

 - react-dev-utils@4.0.1
 - react-error-overlay@2.0.1
 - react-scripts@1.0.13

 - react-dev-utils@4.0.0
 - react-error-overlay@2.0.0
 - react-scripts@1.0.12

* update babel-runtime dependency in react-error-overlay and react-scripts

`babel-runtime@6.23.0` have a dependency on `regenerator-runtime@0.10.5`
`babel-runtime@6.26.0` on `regenerator-runtime@0.11.0`

> npm ls regenerator-runtime

```
└─┬ react-scripts@1.0.11
  ├─┬ babel-core@6.25.0
  │ └─┬ babel-runtime@6.26.0
  │   └── regenerator-runtime@0.11.0
  ├─┬ babel-eslint@7.2.3
  │ └─┬ babel-traverse@6.26.0
  │   └─┬ babel-runtime@6.26.0
  │     └── regenerator-runtime@0.11.0
  ├─┬ babel-runtime@6.23.0
  │ └── regenerator-runtime@0.10.5
  └─┬ react-error-overlay@1.0.10
    └─┬ babel-runtime@6.23.0
      └── regenerator-runtime@0.10.5
```

* fix requested changes

* Convert react-error-overlay to React

* Update compile-time error overlay to use react-error-overlay components

 * Refactor react-error-overlay components to container and presentational components.

 * Make the compile-time error overlay a part of react-error-overlay package.

 * Use react-error-overlay as dependency in react-dev-utils to show compile-time errors.

* Run Prettier

* Move the function name fix into StackFrame itself

* Fix clicking on source code snippet to open the code in editor

* Use exact objects + minor style tweak

* Don't linkify frames that don't exist on the disk

* Fix lint

* Consolidate iframe rendering logic

* Remove circular dependency between react-dev-utils and react-error-overlay

* Fix lint

* Fix decoupling of react-dev-utils and react-error-overlay by moving middleware

* Deduplicate identical errors

 - babel-preset-react-app@3.0.2
 - create-react-app@1.4.0
 - eslint-config-react-app@2.0.0
 - react-dev-utils@3.1.0
 - react-error-overlay@1.0.10
 - react-scripts@1.0.11

* Bump deps

* Fix linter errors

* Whoops

* Try to bump webpack

* Update peer deps to min for eslint 4.x