.eslintrc.js

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

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint',
    sourceType: 'module'
  },
  env: {
    browser: true,
  },
  extends: [
    'prettier',
    // 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.
    "plugin:vue/recommended"
  ],
  // required to lint *.vue files
  plugins: [
    'vue',
    'prettier'
  ],
  // add your custom rules here
  rules: {
    // allow async-await
    'generator-star-spacing': 'off',
    // allow debugger during development
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'arrow-parens': 0,
    'spaced-comment': 0,
    'space-before-function-paren': 1,
    "key-spacing": [0, {
      "singleLine": {
        "beforeColon": false,
        "afterColon": true
      },
      "multiLine": {
        "beforeColon": true,
        "afterColon": true,
        "align": "colon"
      }
    }],
    'no-multi-spaces'   : ['error', {
      exceptions: {
        'Property': true, 'VariableDeclarator': true, 'ImportDeclaration': true, 'AssignmentExpression': true
      }
    }],
    "vue/require-default-prop": 1,
    "vue/max-attributes-per-line": [2, {
      "singleline": 2,
      "multiline": {
        "max": 2,
        "allowFirstLine": true
      }
    }],
    "vue/html-self-closing": ["error", {
      "html": {
        "void": "always",
        "normal": "never"
      }
    }]
  }
}