@vercel/style-guide/eslint/rules/variables.js

Vercel's engineering style guide

module.exports = {
  rules: {
    /**
     * Disallow labels that share a name with a variable.
     *
     * 🚫 Not fixable - https://eslint.org/docs/rules/no-label-var
     */
    'no-label-var': 'error',
    /**
     * Disallow initializing variables to `undefined`.
     *
     * 🔧 Fixable - https://eslint.org/docs/rules/no-undef-init
     */
    'no-undef-init': 'warn',
    /**
     * Disallow unused variables.
     *
     * 🚫 Not fixable - https://eslint.org/docs/rules/no-unused-vars
     */ 'no-unused-vars': [
      'error',
      {
        args: 'after-used',
        argsIgnorePattern: '^_',
        ignoreRestSiblings: false,
        vars: 'all',
        varsIgnorePattern: '^_',
      },
    ],
  },
};