// https://eslint.org/docs/user-guide/configuring

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint'
  },
  env: {
    browser: true,
  },
  // https://github.com/vuejs/eslint-plugin-vue#priority-a-essential-error-prevention
  // consider switching to `plugin:vue/strongly-recommended` or `plugin:vue/recommended` for stricter rules.
  extends: [
    'plugin:vue/essential',
    'airbnb-base',
  ],
  // required to lint *.vue files
  plugins: [
    'vue',
  ],
  // check if imports actually resolve
  settings: {
    'import/resolver': {
      webpack: {
        config: 'build/webpack.base.conf.js'
      }
    }
  },
  // add your custom rules here
  rules: {
    "vue/html-closing-bracket-newline": ["error", {
      "singleline": "never",
      "multiline": "always"
    }],
    "vue/order-in-components": [
      "error", {
        "order": [
          "el",
          "name",
          "parent",
          "functional",
          ["delimiters", "comments"],
          ["components", "directives", "filters"],
          "extends",
          "mixins",
          "inheritAttrs",
          "model",
          ["props", "propsData"],
          "data",
          "computed",
          "watch",
          "LIFECYCLE_HOOKS",
          "methods",
          ["template", "render"],
          "renderError",
        ],
      },
    ],

    // don't require .vue extension when importing
    'import/extensions': ['error', 'always', {
      js: 'never',
      vue: 'never'
    }],
    "indent": ["error", 2],
    // disallow reassignment of function parameters
    // disallow parameter object manipulation except for specific exclusions
    'no-param-reassign': ['error', {
      props: true,
      ignorePropertyModificationsFor: [
        'state', // for vuex state
        'acc', // for reduce accumulators
        'e' // for e.returnvalue
      ]
    }],
    // allow optionalDependencies
    'import/no-extraneous-dependencies': ['error', {
      optionalDependencies: ['test/unit/index.js']
    }],
    // allow debugger during development
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off'
  }
}