node_modules.graphql.subscription.mapAsyncIterator.mjs Maven / Gradle / Ivy

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Maven plugin for generating graphql clients

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function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *  strict
 */

import { $$asyncIterator, getAsyncIterator } from 'iterall';


/**
 * Given an AsyncIterable and a callback function, return an AsyncIterator
 * which produces values mapped via calling the callback function.
 */
export default function mapAsyncIterator(iterable, callback, rejectCallback) {
  var iterator = getAsyncIterator(iterable);
  var $return = void 0;
  var abruptClose = void 0;
  // $FlowFixMe(>=0.68.0)
  if (typeof iterator.return === 'function') {
    $return = iterator.return;
    abruptClose = function abruptClose(error) {
      var rethrow = function rethrow() {
        return Promise.reject(error);
      };
      return $return.call(iterator).then(rethrow, rethrow);
    };
  }

  function mapResult(result) {
    return result.done ? result : asyncMapValue(result.value, callback).then(iteratorResult, abruptClose);
  }

  var mapReject = void 0;
  if (rejectCallback) {
    // Capture rejectCallback to ensure it cannot be null.
    var reject = rejectCallback;
    mapReject = function mapReject(error) {
      return asyncMapValue(error, reject).then(iteratorResult, abruptClose);
    };
  }

  /* TODO: Flow doesn't support symbols as keys:
     https://github.com/facebook/flow/issues/3258 */
  return _defineProperty({
    next: function next() {
      return iterator.next().then(mapResult, mapReject);
    },
    return: function _return() {
      return $return ? $return.call(iterator).then(mapResult, mapReject) : Promise.resolve({ value: undefined, done: true });
    },
    throw: function _throw(error) {
      // $FlowFixMe(>=0.68.0)
      if (typeof iterator.throw === 'function') {
        return iterator.throw(error).then(mapResult, mapReject);
      }
      return Promise.reject(error).catch(abruptClose);
    }
  }, $$asyncIterator, function () {
    return this;
  });
}

function asyncMapValue(value, callback) {
  return new Promise(function (resolve) {
    return resolve(callback(value));
  });
}

function iteratorResult(value) {
  return { value: value, done: false };
}