yarn start broken on develop

[hellochar]

xzhang@xzhang-mbp plottable (develop) $ yarn start
yarn start v0.17.10
$ npm-run-all -p start:update-quicktests start:watch-tsc start:watch-quicktests start:webpack-dev-server 
yarn run v0.17.10
yarn run v0.17.10
yarn run v0.17.10
yarn run v0.17.10
$ grunt watch-quicktests 
$ grunt update-quicktests 
$ webpack-dev-server 
$ tsc -w -p test/ 
error TS5057: Cannot find a tsconfig.json file at the specified directory: 'test/'
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
✨  Done in 0.51s.
✨  Done in 0.52s.
✨  Done in 0.53s.
ERROR: "start:watch-tsc" exited with 1.
error Command failed with exit code 1.