/**
 * @fileoverview Expose out ESLint and CLI to require.
 * @author Ian Christian Myers
 */

'use strict';

//-----------------------------------------------------------------------------
// Requirements
//-----------------------------------------------------------------------------

const { ESLint, shouldUseFlatConfig } = require('./eslint/eslint');
const { LegacyESLint } = require('./eslint/legacy-eslint');
const { Linter } = require('./linter');
const { RuleTester } = require('./rule-tester');
const { SourceCode } = require('./languages/js/source-code');

//-----------------------------------------------------------------------------
// Functions
//-----------------------------------------------------------------------------

/**
 * Loads the correct ESLint constructor given the options.
 * @param {Object} [options] The options object
 * @param {boolean} [options.useFlatConfig] Whether or not to use a flat config
 * @returns {Promise<ESLint|LegacyESLint>} The ESLint constructor
 */
async function loadESLint({ useFlatConfig } = {}) {
  /*
   * Note: The v8.x version of this function also accepted a `cwd` option, but
   * it is not used in this implementation so we silently ignore it.
   */

  const shouldESLintUseFlatConfig =
    useFlatConfig ?? (await shouldUseFlatConfig());

  return shouldESLintUseFlatConfig ? ESLint : LegacyESLint;
}

//-----------------------------------------------------------------------------
// Exports
//-----------------------------------------------------------------------------

module.exports = {
  Linter,
  loadESLint,
  ESLint,
  RuleTester,
  SourceCode,
};