error TS2300: Duplicate identifier 'type' in Angular. while running ng build

### Version info

**Angular: 12.2.0**

**Firebase: 9.0.0**

**@angular/fire: 7.0.0**

**Error: node_modules/@firebase/auth-compat/dist/auth-compat/index.d.ts:53:10 - error TS2300: Duplicate identifier 'type'.**

`import { type User, type Unsubscribe, type ActionCodeInfo, type UserCredential, type Auth, type IdTokenResult, type MultiFactorError, type MultiFactorResolver, type PopupRedirectResolver, type Dependencies, type AuthCredential, type ApplicationVerifier, type ConfirmationResult, type AuthProvider, type MultiFactorUser, type NextOrObserver, type ErrorFn, type CompleteFn, type ActionCodeSettings, type Persistence, type PhoneAuthCredential } from "@firebase/auth";`

**My package.json**
`"dependencies": {
"@angular/animations": "^11.2.9",
"@angular/cdk": "^13.0.2",
"@angular/common": "~12.2.0",
"@angular/compiler": "~12.2.0",
"@angular/core": "~12.2.0",
"@angular/fire": "^7.2.0",
"@angular/forms": "~12.2.0",
"@angular/material": "^11.2.12",
"@angular/platform-browser": "~12.2.0",
"@angular/platform-browser-dynamic": "~12.2.0",
"@angular/router": "~12.2.0",
"@ng-bootstrap/ng-bootstrap": "^10.0.0",
"angularfire2": "^5.4.2",
"aws-sdk": "^2.1081.0",
"bootstrap": "^5.1.3",
"concurrently": "^6.2.1",
"cors": "^2.8.5",
"file-saver": "^2.0.5",
"firebase": "^9.4.1",
"http": "0.0.1-security",
"http-client": "^4.3.1",
"http-server": "^13.0.2",
"karma-chai": "^0.1.0",
"karma-mocha": "^2.0.1",
"karma-spec-reporter": "0.0.32",
"karma-viewport": "^1.0.8",
"mocha": "^9.1.1",
"ngx-toastr": "^14.1.4",
"rxjs": "~6.6.0",
"tslib": "^2.3.0",
"util": "^0.12.4",
"uuid-generator-ts": "^1.1.0",
"zone.js": "~0.11.4"
},
"devDependencies": {
"@angular-devkit/build-angular": "~12.2.6",
"@angular/cli": "~12.2.6",
"@angular/compiler-cli": "~12.2.0",
"@types/file-saver": "^2.0.5",
"@types/jasmine": "~3.8.0",
"@types/node": "^12.20.46",
"@types/uuid": "^8.3.4",
"jasmine-core": "~3.8.0",
"karma": "~6.3.0",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage": "~2.0.3",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "~1.7.0",
"typescript": "~4.3.5"
`
**My tsconfig.json**
`{
"compileOnSave": false,
"compilerOptions": {
"baseUrl": "./",
"outDir": "./dist/out-tsc",
"forceConsistentCasingInFileNames": true,
"strict": true,
"noImplicitReturns": true,
"noFallthroughCasesInSwitch": true,
"sourceMap": true,
"declaration": false,
"downlevelIteration": true,
"experimentalDecorators": true,
"moduleResolution": "node",
"importHelpers": true,
"target": "es2017",
"module": "es2020",
"lib": [
"es2018",
"dom"
]
},
"angularCompilerOptions": {
"enableI18nLegacyMessageIdFormat": false,
"strictInjectionParameters": true,
"strictInputAccessModifiers": true,
"strictTemplates": false
}
}`

after i **add skipLipCheck: true** in **tsconfig.json** file, i get below error.

`Error: node_modules/@firebase/auth-compat/dist/auth-compat/index.d.ts:53:421 - error TS1005: ',' expected.`

`import { type User, type Unsubscribe, type ActionCodeInfo, type UserCredential, type Auth, type IdTokenResult, type MultiFactorError, type MultiFactorResolver, type PopupRedirectResolver, type Dependencies, type AuthCredential, type ApplicationVerifier, type ConfirmationResult, type AuthProvider, type MultiFactorUser, type NextOrObserver, type ErrorFn, type CompleteFn, type ActionCodeSettings, type Persistence, type PhoneAuthCredential } from "@firebase/auth";`

How to fix this error?

Comienza con package.json y tsconfig.json y luego ejecuta ng build para reproducir los errores de TypeScript de @firebase/auth-compat/dist/auth-compat/index.d.ts. Comprueba las versiones de Angular, TypeScript, Firebase y @angular/fire con respecto a los errores de sintaxis y de identificadores duplicados indicados; la tarea está terminada cuando el proyecto se compila sin estos errores.

Escrito por el modelo de indexación a partir del texto del issue.