* convert mocha tests to jest

* jest 23

* add jest configs

* use material css

* fix windows

* forceExit jest test

* force exit eject

* test

* test

* retrigger test

* remove appveyor comment

* try to remove pretendToBeVisual option

* use jsdom env

* test environment

* no cache

* test no close

* bring back raf

* test revert all broken changes

* add back jsdom

* remove jsdom

* node test environment

* use latest change

* runInBand

* runInBand

* comment test run

* try different jest option

* standardize jest test options

* increase heap size

* remove heap size config

* support scoped packages for cra --scripts-version option

* upgrade jest version

* fix windows

* fix windows again

* jest 23.4.1

* babel-jest

* babel-jest

* split out kitchhensink

* travis node 6

* travis node 6 config

* node 6 travis eject

* cache yarn

* only cache yarn

* remove unrelated changes

* typo

Adjust the default browsers to be a single list and remove it from the build output; it only affects CSS now

* Correct babel dependency compile target

* Correctly compile runtime for dependencies

This is the best behavior so people have seamless upgrades to new React majors.

This is probably a terrible default warning from the ESLint plugin, and we need to wait for https://github.com/yannickcr/eslint-plugin-react/issues/1955 before changing this hardcoded behavior.

Closes #5034

Closes #5020

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* No lock files prevents the use of yarn upgrade & outdated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

* Updates to reflect service worker registration being opt-in.

* Fixed an anchor link.

* Updates to SWPrecacheWebpackPlugin config, and corresponding docs.

* Upgrade html webpack plugin

* Fix build

* Disable webpack chunk rollup

* Bump timeout

* Revert "Bump timeout"

This reverts commit 84632115d178b48e08eb75dc5e9a921ece6aa759.

* fix FileSizeReporter in Windows enviroment

* chore: change line endings

* Revert Lerna dependency, there's too many bugs in v3

* Remove `mjs` support

This reverts commit b43ad04b.

This reverts commit aa8789b1.

This reverts commit 47d2d941.

This reverts commit 2c34d5b6.

This reverts commit 9690bc86.

This reverts commit 058d03f8.

Uglify is no longer maintained and has bugs not present in Terser (its successor)

The `formatter` option is incompatible with with `thread-loader`.
The `formatter` option previously accepted a function which was lost during JSON serialization.