/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *  strict-local
 * @format
 */
'use strict';

/**
 * Converts a FetchFunction into an ExecuteFunction for use by RelayNetwork.
 */
function convertFetch(fn) {
  return function fetch(request, variables, cacheConfig, uploadables) {
    var result = fn(request, variables, cacheConfig, uploadables); // Note: We allow FetchFunction to directly return Error to indicate
    // a failure to fetch. To avoid handling this special case throughout the
    // Relay codebase, it is explicitly handled here.

    if (result instanceof Error) {
      return require("./RelayObservable").create(function (sink) {
        return sink.error(result);
      });
    }

    return require("./RelayObservable").from(result);
  };
}
/**
 * Converts a SubscribeFunction into an ExecuteFunction for use by RelayNetwork.
 */


function convertSubscribe(fn) {
  return function subscribe(operation, variables, cacheConfig) {
    return require("./RelayObservable").fromLegacy(function (observer) {
      return fn(operation, variables, cacheConfig, observer);
    });
  };
}

module.exports = {
  convertFetch: convertFetch,
  convertSubscribe: convertSubscribe
};