.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
    project: 'tsconfig.json',
  },
  reportUnusedDisableDirectives: true,
  plugins: ['@typescript-eslint', 'import'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/recommended-requiring-type-checking',
    'plugin:import/errors',
    'plugin:import/warnings',
    'plugin:import/typescript',
    'plugin:prettier/recommended',
    'prettier',
  ],
  rules: {
    '@typescript-eslint/consistent-type-imports': 'error',
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/explicit-member-accessibility': [
      'error',
      {
        accessibility: 'explicit',
      },
    ],
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/no-empty-interface': 'off',
    '@typescript-eslint/no-non-null-assertion': 'off',
    '@typescript-eslint/no-unnecessary-type-assertion': 'error',
    '@typescript-eslint/no-unused-vars': [
      'error',
      { args: 'after-used', argsIgnorePattern: '^_' },
    ],
    '@typescript-eslint/prefer-nullish-coalescing': 'error',
    '@typescript-eslint/prefer-optional-chain': 'error',
    // '@typescript-eslint/prefer-readonly': 'error',
    '@typescript-eslint/require-await': 'warn',
    '@typescript-eslint/strict-boolean-expressions': [
      'error',
      {
        allowNullableBoolean: true,
        allowNullableObject: true,
        allowNullableString: true,
        allowNullableNumber: true,
      },
    ],
    '@typescript-eslint/switch-exhaustiveness-check': 'error',
    'import/order': [
      'error',
      {
        groups: [
          'index',
          'sibling',
          'parent',
          'internal',
          'external',
          'builtin',
        ],
        'newlines-between': 'always',
      },
    ],
    'import/no-cycle': ['error'],
    'max-classes-per-file': 'off',
    'prefer-template': 'error',
    eqeqeq: ['error', 'always'],
  },
  settings: {
    'import/resolver': {
      typescript: {},
    },
    'import/external-module-folders': ['node_modules', 'typings'],
  },
  overrides: [
    {
      files: ['*.spec.ts'],
      rules: {
        '@typescript-eslint/consistent-type-imports': 'off',
        '@typescript-eslint/no-unsafe-assignment': 'off',
        '@typescript-eslint/no-unsafe-call': 'off',
        '@typescript-eslint/no-unsafe-member-access': 'off',
        '@typescript-eslint/no-unsafe-return': 'off',
        '@typescript-eslint/no-var-requires': 'off',
        '@typescript-eslint/restrict-template-expressions': 'off',
      },
    },
    {
      files: ['*.type.ts'],
      rules: {
        '@typescript-eslint/no-explicit-any': 'off',
      },
    },
    {
      files: ['*.js', '.*.js'],
      rules: {
        '@typescript-eslint/no-unsafe-assignment': 'off',
        '@typescript-eslint/no-unsafe-call': 'off',
        '@typescript-eslint/no-unsafe-member-access': 'off',
        '@typescript-eslint/no-var-requires': 'off',
        'no-undef': 'off',
      },
    },
  ],
}