非常感谢,现在偶然发现了同样的问题。
如果有人遇到此错误:
WARNING in ./node_modules/firebaseui/dist/esm.js 101:378-415 export 'default' (imported as 'firebase') was not found in 'firebase/app' (possible exports: FirebaseError, SDK_VERSION, _DEFAULT_ENTRY_NAME, _addComponent, _addOrOverwriteComponent, _apps, _clearComponents, _components, _getProvider, _registerComponent, _removeServiceInstance, deleteApp, getApp, getApps, initializeApp, onLog, registerVersion, setLogLevel)
与firebase 5.0.0直接相关,与firebase 9.0.2不兼容。转至 firebaseui@next 即可解决此问题。