i cant use firebase.user

i cant use firebase.user when i use user:observable in my service he give me this error

ERROR in src/app/service/auth.service.ts:9:26 - error TS2694: Namespace '"C:/Users/mo-ro/code/myApp/node_modules/firebase/index"' has no exported member 'User'.

9 user:Observable<firebase.User>
                           ~~~~

i use "-": "0.0.1", "@angular/animations": "~10.1.4", "@angular/common": "~10.1.4", "@angular/compiler": "~10.1.4", "@angular/core": "~10.1.4", "@angular/fire": "^6.0.4", "@angular/forms": "~10.1.4", "@angular/localize": "~10.1.4", "@angular/platform-browser": "~10.1.4", "@angular/platform-browser-dynamic": "~10.1.4", "@angular/router": "~10.1.4", "@ng-bootstrap/ng-bootstrap": "^7.0.0", "angularfire2": "^5.4.2", "bootstrap": "^4.5.3", "firebase": "^8.0.0", "firestore-models": "^1.6.3", "rxjs": "~6.6.0", "save": "^2.4.0", "tslib": "^2.0.0", "zone.js": "~0.10.2" }, "devDependencies": { "@angular-devkit/architect": ">= 0.900 < 0.1100", "@angular-devkit/build-angular": "~0.1001.4", "@angular/cli": "^10.1.7", "@angular/compiler-cli": "~10.1.4", "@types/jasmine": "~3.5.0", "@types/jasminewd2": "~2.0.3", "@types/node": "^12.11.1", "codelyzer": "^6.0.0", "firebase-tools": "^8.0.0", "fuzzy": "^0.1.3", "inquirer": "^6.2.2", "inquirer-autocomplete-prompt": "^1.0.1", "jasmine-core": "~3.6.0", "jasmine-spec-reporter": "~5.0.0", "karma": "~5.0.0", "karma-chrome-launcher": "~3.1.0", "karma-coverage-istanbul-reporter": "~3.0.2", "karma-jasmine": "~4.0.0", "karma-jasmine-html-reporter": "^1.5.0", "open": "^7.0.3", "protractor": "~7.0.0", "ts-node": "~8.3.0", "tslint": "~6.1.0", "typescript": "~4.0.2" }

Originally posted by @rahrl in https://github.com/angular/angularfire/issues/1065#issuecomment-720142620

angular / angularfire

i cant use firebase.user #2658