@vercel/style-guide/eslint/_base.js

Vercel's engineering style guide

const { ECMA_VERSION, JAVASCRIPT_FILES } = require('./constants');

// See: https://github.com/eslint/eslint/issues/3458
require('@rushstack/eslint-patch/modern-module-resolution');

/**
 * This is the base for both our browser and Node ESLint config files.
 */
module.exports = {
  extends: [
    'eslint:recommended',
    'plugin:import/recommended',
    'prettier',
    require.resolve('./rules/best-practice'),
    require.resolve('./rules/comments'),
    require.resolve('./rules/es6'),
    require.resolve('./rules/import'),
    require.resolve('./rules/possible-errors'),
    require.resolve('./rules/stylistic'),
    require.resolve('./rules/unicorn'),
    require.resolve('./rules/variables'),
  ],
  env: {
    [`es${ECMA_VERSION}`]: true,
  },
  // Report unused `eslint-disable` comments.
  reportUnusedDisableDirectives: true,
  // Tell ESLint not to ignore dot-files, which are ignored by default.
  ignorePatterns: ['!.*.js'],
  // Global settings used by all overrides.
  settings: {
    // Use the Node resolver by default.
    'import/resolver': { node: {} },
  },
  // Global parser options.
  parserOptions: {
    ecmaVersion: ECMA_VERSION,
    sourceType: 'module',
  },
  overrides: [
    {
      files: JAVASCRIPT_FILES,
      parser: '@babel/eslint-parser',
      parserOptions: {
        requireConfigFile: false,
      },
    },
  ],
};