.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
  },
  env: {
    browser: true,
    es6: true,
    jest: true,
  },
  settings: {
    'import/resolver': {
      node: {
        extensions: ['.js', '.ts'],
      },
    },
  },
  extends: ['airbnb', 'prettier'],
  rules: {
    'prettier/prettier': 'warn',
    'no-unused-vars': 'off',
    '@typescript-eslint/no-unused-vars': ['error', { vars: 'all', args: 'after-used' }],
    'no-useless-constructor': 'off',
    '@typescript-eslint/no-useless-constructor': 'error',
    'no-use-before-define': 'off',
    '@typescript-eslint/no-use-before-define': 'error',
    'no-unused-expressions': 'off',
    '@typescript-eslint/no-unused-expressions': 'error',
    'no-underscore-dangle': 'off',
    'func-names': 'off',
    'no-alert': 'off',
    'import/extensions': 'off',
    'import/no-extraneous-dependencies': ['error', { devDependencies: true }],
    'class-methods-use-this': 'off',
    'no-return-assign': ['error', 'except-parens'],
    'max-classes-per-file': 'off',
  },
  plugins: ['@typescript-eslint', 'prettier'],
}