.eslintrc.js

const { resolve } = require('node:path');

const project = resolve(process.cwd(), 'tsconfig.json');

/** @type {import("eslint").Linter.Config} */
module.exports = {
  extends: [
    'eslint:recommended',
    'prettier',
    'plugin:prettier/recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
  ],
  plugins: ['@typescript-eslint', 'simple-import-sort', 'prettier'],
  globals: {
    React: true,
    JSX: true,
  },
  env: {
    node: true,
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
  },
  settings: {
    'import/resolver': {
      typescript: {
        project,
      },
    },
  },
  ignorePatterns: [
    // Ignore dotfiles
    '.*.js',
    'node_modules/',
    'dist/',
  ],
  rules: {
    complexity: ['error', 10],
    'prefer-object-spread': 'error',
    'prefer-const': ['error', { destructuring: 'all' }],
    'func-names': ['error', 'as-needed'],
    'no-new-object': 'error',
    'no-eq-null': 'error',
    eqeqeq: 'error',
    'arrow-body-style': ['warn', 'as-needed'],
    curly: ['error', 'all'],
    'prefer-arrow-callback': ['error', { allowNamedFunctions: true }],
    'prefer-spread': 'error',
    'no-duplicate-imports': 'error',
    'guard-for-in': 'error',
    'no-useless-call': 'error',
    'no-useless-return': 'error',
    'no-useless-concat': 'error',
    'no-eval': 'error',
    'no-floating-decimal': 'error',
    'default-case': 'error',
    'default-case-last': 'error',
    'max-statements-per-line': 'error',
    'max-params': ['warn', { max: 6 }],
    'prettier/prettier': 'error',
    'simple-import-sort/imports': [
      'error',
      {
        groups: [['^\\u0000', '^@?\\w', '^[^.]', '^\\.']],
      },
    ],
    'simple-import-sort/exports': 'error',
    '@typescript-eslint/no-misused-promises': 'off',
    '@typescript-eslint/no-shadow': 'error',
    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
    '@typescript-eslint/no-dupe-class-members': 'error',
    '@typescript-eslint/no-meaningless-void-operator': 'error',
    '@typescript-eslint/no-non-null-asserted-nullish-coalescing': 'error',
    '@typescript-eslint/no-unnecessary-boolean-literal-compare': 'error',
    '@typescript-eslint/no-unnecessary-type-arguments': 'error',
    '@typescript-eslint/no-unnecessary-type-assertion': 'error',
    '@typescript-eslint/no-useless-empty-export': 'error',
    '@typescript-eslint/no-throw-literal': [
      'error',
      {
        // This should ideally be `false`, but it makes rethrowing errors inconvenient. There should be a separate `allowRethrowingUnknown` option.
        allowThrowingUnknown: true,
        allowThrowingAny: false,
      },
    ],
  },
  overrides: [
    {
      files: ['*.test.ts', '*.spec.ts'],
      plugins: ['jest'],
    },
  ],
};