Yarn Run Setup failing at react-jest-workshop@1.0.0 validate script: receives object (where only string or buffer accepted)

Your learning materials appear carefully thought out and very well constructed, and I am interested in working through the exercises in this workshop.

Should I be specifying a selection for the REGEX 'state' to allow just one of the either workshop or final states to build?

$ yarn run setup
yarn run v1.7.0
$ node ./scripts/verify && node ./scripts/install && npm run validate

📦 Installing dependencies via yarn install
[1/4] Resolving packages...
success Already up-to-date.

react-jest-workshop@1.0.0 validate C:\Users\MyUserName\Documents\react-jest-workshop
npm run generate -s && npm run lint -s && npm run test:final -s

(node:11748) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be one of type string or Buff
er. Received type object
at validChunk (_stream_writable.js:258:10)
at WriteStream.Writable.write (_stream_writable.js:292:21)
at C:\Users\MyUserName\Documents\react-jest-workshop\node_modules\split-guide\dist\bin\index.js:41:20
(node:11748) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async
function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:11748) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not h
andled will terminate the Node.js process with a non-zero exit code.
Error: Jest: Failed to parse config file C:\Users\MYUserName\Documents\react-jest-workshop\exercises-final\jest.config.jso
n.
at parse (C:\Users\MyUserName\Documents\react-jest-workshop\node_modules\jest-config\build\loadFromFile.js:22:15)
at promisify.then.data (C:\Users\MyUserName\Documents\react-jest-workshop\node_modules\jest-config\build\loadFromFile.
js:26:20)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react-jest-workshop@1.0.0 validate: npm run generate -s && npm run lint -s && npm run test:final -s
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-jest-workshop@1.0.0 validate script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\MyUserName\AppData\Roaming\npm-cache_logs\2018-07-22T16_50_19_715Z-debug.log
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Start with scripts/verify, scripts/install, the validate command shown in the log, and exercises-final/jest.config.json; reproduce yarn run setup and inspect the split-guide stack trace. Done means setup completes, the generated Jest configuration parses, and the validate script finishes successfully.