module.exports = {
  env: {
    es6: true,
  },
  parserOptions: {
    ecmaVersion: 6,
  },

  rules: {
    /**
     * Possible Errors
     *
     * https://eslint.org/docs/rules/#possible-errors
     */
    'no-compare-neg-zero': 2,
    'no-cond-assign': 2,
    'no-console': 2,
    'no-constant-condition': 2,
    'no-debugger': 2,
    'no-dupe-args': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-empty': 2,
    'no-empty-character-class': 2,
    'no-ex-assign': 2,
    'no-extra-boolean-cast': 2,
    'no-extra-semi': 2,
    'no-func-assign': 2,
    'no-inner-declarations': 2,
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-obj-calls': 2,
    'no-regex-spaces': 2,
    'no-sparse-arrays': 0,
    'no-template-curly-in-string': 2,
    'no-unexpected-multiline': 2,
    'no-unreachable': 2,
    'no-unsafe-finally': 2,
    'use-isnan': 2,
    'valid-typeof': 2,
    eqeqeq: ['error', 'always'],

    /**
     * Best Practices
     *
     * https://eslint.org/docs/rules/#best-practices
     */
    'no-caller': 2,
    'no-case-declarations': 2,
    'no-empty-pattern': 2,
    'no-extend-native': 2,
    'no-new-wrappers': 2,
    'no-octal': 2,
    'no-redeclare': 2,
    'no-self-assign': 2,
    'no-unused-labels': 2,
    'no-var': 2,

    /**
     * ESLint's "Variables" rules
     *
     * https://eslint.org/docs/rules/#variables
     */
    'no-delete-var': 2,
    'no-undef': 2,
    'no-unused-vars': [
      2,
      {
        args: 'none',
        ignoreRestSiblings: true,
      },
    ],
    'no-use-before-define': [
      2,
      {
        functions: false,
      },
    ],

    /**
     * ECMAScript 6
     *
     * https://eslint.org/docs/rules/#ecmascript-6
     */
    'constructor-super': 2,
  },
};