eslint: Parsing error: "parserOptions.project" has been set for @typescript-eslint/parser.

Here is the fix

https://github.com/nestjs/nest/issues/4900#issuecomment-669743374

Bug Report

I installed nest and start new project. and there is a problem with eslint: in .eslint.js I got error

Parsing error: "parserOptions.project" has been set for @typescript-eslint/parser.
The file does not match your project config: .eslintrc.js.
The file must be included in at least one of the projects provided.

eslint in code also not working, and command npm run lint doesn’t find any problems.

Current behavior

Input Code

.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    sourceType: 'module',
    project: 'tsconfig.json'
  },
  plugins: ['@typescript-eslint/eslint-plugin'],
  extends: [
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'prettier',
    'prettier/@typescript-eslint',
  ],
...
};

I didn’t change anything actually.

Environment

Nest version: 7.2.0
 
For Tooling issues:
- Node version: 13.10.1
- Platform:  Linux mint

webstorm, npm 6.13.7.

is it reproduced or is it just me?

[ghost]

In my opinion, NestJS creates an erroneous configuration.

The file .eslintrc.js shoud look like this:

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    sourceType: 'module',
  },
  plugins: ['@typescript-eslint/eslint-plugin'],
  extends: [
    'plugin:@typescript-eslint/recommended',
    'prettier/@typescript-eslint',
    'plugin:prettier/recommended',
  ],
  root: true,
  env: {
    node: true,
    jest: true,
  },
  ignorePatterns: ['.eslintrc.js'], // !!! new and important part !!!
  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',
  },
};

By adding ignorePatterns: ['.eslintrc.js'] eslint is told to ignore the .eslintrc.js file itself.

Otherwise it results in an error, because eslint tries to lint the .eslintrc.js file, even though it is not included in the tsconfig.json configuration.

See also https://github.com/typescript-eslint/typescript-eslint/issues/967#issuecomment-530907956.

[stvnwrgs]

Adding "createDefaultProgram": true to the tsconfig, after doing https://github.com/nestjs/nest/issues/4900#issuecomment-669743374 fixed it for me.

  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "./tsconfig.json",
    "sourceType": "module",
    "createDefaultProgram": true
  },
  ...