In local development, `npm run storybook` should start a Storybook server at <http://localhost:6006> with hot module replacement to reflect live changes.
On Mac OS, `npm run test` may trigger an `EMFILE` error. In this case, to get tests running, you may need to `brew install watchman`. (If the watchman postinstall step fails, follow the instructions [here](https://stackoverflow.com/a/41320226) to change `/usr/local` ownership from root to your user account.)