Using the recommended Prettier plugin for TypeScript in ESLint is causing issues with the ability to use the override keyword

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The following configuration is for eslintrc, taken from NestJS stock config:

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    sourceType: 'module',
  },
  plugins: [
    '@typescript-eslint/eslint-plugin',
    'filenames'
  ],
  extends: [
    'plugin:@typescript-eslint/recommended',
    'plugin:prettier/recommended',
  ],
  root: true,
  env: {
    node: true,
    jest: true,
  },
  ignorePatterns: ['.eslintrc.js'],
  rules: {
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-explicit-any': 'off',
    'filenames/match-regex': [2, "^[0-9a-z-.]+$", true]
  },
};

This configures Prettier:

{
  "singleQuote": true,
  "trailingComma": "all"
}

And here is the tsconfig configuration:

{
  "compilerOptions": {
    "moduleResolution": "node",
    "module": "commonjs",
    "esModuleInterop": true,
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2017",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": ".",
    "rootDir": ".",
    "incremental": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "strictNullChecks": true,
    "noImplicitAny": true,
    "strictBindCallApply": true,
    "forceConsistentCasingInFileNames": false,
    "noFallthroughCasesInSwitch": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noImplicitReturns": true,
    "noImplicitOverride": true
  }
}

In my code implementation, I have a class defined like so:

@Injectable()
export class FirebaseStrategy extends PassportStrategy(
  FirebaseAuthStrategy,
  'firebase',
) {
  constructor(private usersService: UsersService) {
    super({ extractor: ExtractJwt.fromAuthHeaderAsBearerToken() });
  }

  override async validate(payload: FirebaseUser): Promise<User | undefined> {
    return this.usersService.findByFirebaseUid(payload.uid);
  }
}

The code runs without issues but I encounter an error when linting:

/app/src/auth/strategy/firebase.strategy.ts
  22:12  error  Parsing error: Unexpected token  prettier/prettier

Is there a solution to resolve this issue? Ideally, I would prefer avoiding implicit overrides.

Answer №1

Ensure that your prettier version is updated to at least 2.3.1, as support for TypeScript 4.3 features such as the override keyword was introduced in that release. To update, you can modify the package.json file or run npm i -D prettier@^2.3.1 (if npm is your chosen package manager).

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