.eslintrc.js

module.exports = {
  env: {
    node: true,
  },
  extends: ['plugin:prettier/recommended', 'eslint:recommended', 'plugin:@typescript-eslint/recommended'],
  plugins: ['prettier', '@typescript-eslint'],
  rules: {
    quotes: ['error', 'single', { avoidEscape: true }],
    'comma-dangle': [
      'error',
      {
        arrays: 'always-multiline',
        objects: 'always-multiline',
        imports: 'always-multiline',
        exports: 'always-multiline',
        functions: 'never',
      },
    ],
    'import/order': [
      'error',
      {
        alphabetize: {
          order: 'asc',
          caseInsensitive: true,
        },
        'newlines-between': 'always',
      },
    ],
    '@typescript-eslint/no-unused-vars': 'warn',
    'prettier/prettier': [
      'error',
      {
        singleQuote: true,
        trailingComma: 'es5',
        printWidth: 140,
      },
    ],
    '@typescript-eslint/ban-ts-comment': 'off',
  },
  settings: {
    'import/resolver': {
      typescript: {
        alwaysTryTypes: true,
      },
      alias: {
        map: [['@', 'src']],
        extensions: ['.ts', '.js', '.jsx', '.json'],
      },
    },
    'import/core-modules': ['sinon'],
  },
  parserOptions: {
    parser: '@typescript-eslint/parser',
  },
  overrides: [
    {
      files: ['**/__tests__/*.{j,t}s?(x)', '**/*.spec.{j,t}s?(x)'],
      env: {
        jest: true,
      },
    },
    {
      files: ['**/*.ts', '**/*.tsx'],
      rules: {
        'no-unused-vars': ['off'],
        'no-undef': ['off'],
      },
    },
  ],
};