yarn storybook で Storybook を起動時にこんな感じのエラーが出た。
ERR! SyntaxError: app/node_modules/.cache/storybook/dev-server/325c8f456729b912b0d2134054eb7448-41ac79ddc5290d504ad69ef1fe8200a7: Unexpected end of JSON input
ERR! at JSON.parse (<anonymous>)
ERR! at app/node_modules/file-system-cache/node_modules/jsonfile/index.js:36:18
ERR! at app/node_modules/graceful-fs/graceful-fs.js:123:16
ERR! at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:63:3)
ERR! SyntaxError: app/node_modules/.cache/storybook/dev-server/325c8f456729b912b0d2134054eb7448-41ac79ddc5290d504ad69ef1fe8200a7: Unexpected end of JSON input
ERR! at JSON.parse (<anonymous>)
ERR! at app/node_modules/file-system-cache/node_modules/jsonfile/index.js:36:18
ERR! at app/node_modules/graceful-fs/graceful-fs.js:123:16
ERR! at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:63:3)
WARN Broken build, fix the error above.
WARN You may need to refresh the browser.キャッシュが関係してそうだったので以下のコマンドで node_modules 内の Storybook のキャッシュを削除したら無事起動しました。
rm -rf node_modules/.cache/storybook参考：error with cache when running storybook · Issue #13795 · storybookjs/storybook · GitHub