// createCachedDescriptors
function createCachedDescriptors(dirname, options, alias) {
  const {
    plugins,
    presets,
    passPerPreset
  } = options;
  return {
    options: optionsWithResolvedBrowserslistConfigFile(options, dirname),
    plugins: plugins ? () => createCachedPluginDescriptors(plugins, dirname)(alias) : () => handlerOf([]),
    presets: presets ? () => createCachedPresetDescriptors(presets, dirname)(alias)(!!passPerPreset) : () => handlerOf([])
  };
}

// createDescriptor
function* createDescriptor(pair, dirname, {
  type,
  alias,
  ownPass
}) {
  const desc = (0, _item.getItemDescriptor)(pair);
  if (desc) {
    return desc;
  }
  let name;
  let options;
  let value = pair;
  if (Array.isArray(value)) {
    if (value.length === 3) {
      [value, options, name] = value;
    } else {
      [value, options] = value;
    }
  }
  let file = undefined;
  let filepath = null;
  if (typeof value === "string") {
    if (typeof type !== "string") {
      throw new Error("To resolve a string-based item, the type of item must be given");
    }
    const resolver = type === "plugin" ? _index.loadPlugin : _index.loadPreset;
    const request = value;
    ({
      filepath,
      value
    } = yield* resolver(value, dirname));
    file = {
      request,
      resolved: filepath
    };
  }
  if (!value) {
    throw new Error(`Unexpected falsy value: ${String(value)}`);
  }
  if (typeof value === "object" && value.__esModule) {
    if (value.default) {
      value = value.default;
    } else {
      throw new Error("Must export a default export when using ES6 modules.");
    }
  }
  if (typeof value !== "object" && typeof value !== "function") {
    throw new Error(`Unsupported format: ${typeof value}. Expected an object or a function.`);
  }
  if (filepath !== null && typeof value === "object" && value) {
    throw new Error(`Plugin/Preset files are not allowed to export objects, only functions. In ${filepath}`);
  }
  return {
    name,
    alias: filepath || alias,
    value,
    options,
    dirname,
    ownPass,
    file
  };
}

// createUncachedDescriptors
function createUncachedDescriptors(dirname, options, alias) {
  return {
    options: optionsWithResolvedBrowserslistConfigFile(options, dirname),
    plugins: (0, _functional.once)(() => createPluginDescriptors(options.plugins || [], dirname, alias)),
    presets: (0, _functional.once)(() => createPresetDescriptors(options.presets || [], dirname, alias, !!options.passPerPreset))
  };
}