.eslintrc.js

module.exports = {
  root: true,
  env: {
    es6: true,
    node: true,
    'jest/globals': true,
  },
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint', 'jest', 'prettier'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:jest/recommended',
    'prettier/@typescript-eslint',
    'plugin:prettier/recommended',
  ],
  rules: {
    'prettier/prettier': 'error',
    // too many tests to fix, disable for now
    '@typescript-eslint/ban-types': 'off',
    // customize argument ignore pattern
    'no-unused-vars': 'off',
    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
  },
  overrides: [
    {
      files: ['*.js'],
      rules: {
        '@typescript-eslint/no-var-requires': 'off',
        '@typescript-eslint/explicit-function-return-type': 'off',
      },
    },
  ],
  reportUnusedDisableDirectives: true,
};