First, try to upgrade yarn.

$ brew upgrade yarn
==> Upgrading yarn 1.22.4 -> 1.22.10

But when try to yarn start, saw this error.

yarn run v1.22.10
$ node scripts/test.js --env=jsdom src/App.test.js
Error: `fsevents` unavailable (this watcher can only be used on Darwin)
    at new FSEventsWatcher (/Users/foo.bar/source/hello-world/node_modules/sane/src/fsevents_watcher.js:41:11)
    at createWatcher (/Users/foo.bar/source/hello-world/node_modules/jest-haste-map/build/index.js:780:23)
    at Array.map (<anonymous>)
    at HasteMap._watch (/Users/foo.bar/source/hello-world/node_modules/jest-haste-map/build/index.js:936:44)
    at /Users/foo.bar/source/hello-world/node_modules/jest-haste-map/build/index.js:355:23
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Found this solution, said it’s related to watchman. (https://github.com/jest-community/vscode-jest/issues/423#issuecomment-462259867)

Then try to upgrade watchman also.

$ brew upgrade watchman
==> Upgrading watchman 4.9.0_2 -> 4.9.0_5

Problem solved at last.