.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint', 'import'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'prettier',
    'plugin:import/typescript',
  ],
  rules: {
    // https://eslint.org/docs/rules/
    'no-fallthrough': 'off', // https://github.com/ionic-team/eslint-config/issues/7
    'no-constant-condition': 'off',

    // https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/eslint-plugin/docs/rules
    '@typescript-eslint/no-this-alias': 'off',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/explicit-module-boundary-types': [
      'error',
      { allowArgumentsExplicitlyTypedAsAny: true },
    ],

    // https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/eslint-plugin/docs/rules
    '@typescript-eslint/array-type': 'error',
    '@typescript-eslint/consistent-type-assertions': 'error',
    '@typescript-eslint/consistent-type-imports': 'error',
    '@typescript-eslint/prefer-for-of': 'error',
    '@typescript-eslint/prefer-optional-chain': 'error',

    // https://github.com/benmosher/eslint-plugin-import
    'import/first': 'error',
    'import/order': [
      'error',
      {
        'alphabetize': { order: 'asc', caseInsensitive: false },
        'groups': [['builtin', 'external'], 'parent', ['sibling', 'index']],
        'newlines-between': 'always',
      },
    ],
    'import/newline-after-import': 'error',
    'import/no-duplicates': 'error',
    'import/no-mutable-exports': 'error',
  },
};