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?

まず package.json と tsconfig.json から始め、次に ng build を実行して @firebase/auth-compat/dist/auth-compat/index.d.ts で発生している TypeScript エラーを再現します。報告されている構文エラーと Duplicate-Identifier エラーに対して、Angular、TypeScript、Firebase、@angular/fire のバージョンを確認します。これらのエラーなしでプロジェクトをビルドできれば完了です。

索引モデルが issue の本文から書いたものです。