com.google.javascript.jscomp.js.es6.promise.any.js Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of closure-compiler-unshaded Show documentation

Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

The newest version!

/*
 * Copyright 2018 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview
 * @suppress {uselessCode}
 */

'require util/polyfill';
'require es6/array/from';
'require es6/promise/promise';
'require es6/promise/aggregateerror';


$jscomp.polyfill('Promise.any', function(orig) {
  if (orig) return orig;

  // This matches the AggregateError's message that V8 reports, but may not
  // match other browsers.
  var aggregate_error_msg = 'All promises were rejected';

  /**
   * Convert all iterables to an array to be able to filter them using `.map`.
   * @param {!Iterable} iterable
   * @return {!Array}
   * @template VALUE
   */
  function resolvingArray(iterable) {
    if (iterable instanceof Array) {
      return iterable;
    } else {
      return Array.from(iterable);
    }
  }

  /**
   * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
   * @param {!Iterable<*>} thenablesOrValues
   * @return {!Promise<*>}
   * @suppress {reportUnknownTypes}
   */
  var polyfill = function(thenablesOrValues) {
    thenablesOrValues = resolvingArray(thenablesOrValues);
    return Promise
        .all(thenablesOrValues.map(function(p) {
          return Promise.resolve(p).then(
              function(val) {
                // One of the promises succeeded.
                // Treat it as a rejection so `Promise.all` immediately bails
                // out.
                throw val;
              },
              function(err) {
                // One of the promises rejected, count that as a resolution so
                // that `Promise.all` will continue to wait for other possible
                // successes.
                return err;
              });
        }))
        .then(
            // If the above 'Promise.all' resolved, then none of the promises
            // succeeded. Return a failed Promise with an AggregateError
            // containing all errors.
            function(errors) {
              throw new AggregateError(errors, aggregate_error_msg);
            },
            // If 'Promise.all' rejected, return a Promise that propagates the
            // succeeded Promise's result.
            function(val) {
              return val;
            });
  };
  return polyfill;
}, 'es_2021', 'es3');