.eslintrc.js

// 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'],
  // required to lint *.vue files
  plugins: ['vue'],
  // add your custom rules here
  rules: {
    // allow debugger during development 
    // console.log(process.env.NODE_ENV)
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
    'comma-dangle': [
      'error',
      {
        arrays: 'always-multiline',
        objects: 'always-multiline',
        functions: 'always-multiline',
        imports: 'never',
        exports: 'never',
      },
    ],
    'no-var': ['error'],
    // semi: ['error', 'always'],
    quotes: ['error', 'single'],
    indent: ['error', 2],
  },
};