.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/esnext.async-iterator.reduce.js

   1 'use strict';
   2 // https://github.com/tc39/proposal-iterator-helpers
   3 var $ = require('../internals/export');
   4 var global = require('../internals/global');
   5 var call = require('../internals/function-call');
   6 var aCallable = require('../internals/a-callable');
   7 var anObject = require('../internals/an-object');
   8 var getBuiltIn = require('../internals/get-built-in');
   9
  10 var Promise = getBuiltIn('Promise');
  11 var TypeError = global.TypeError;
  12
  13 $({ target: 'AsyncIterator', proto: true, real: true }, {
  14   reduce: function reduce(reducer /* , initialValue */) {
  15     var iterator = anObject(this);
  16     var next = aCallable(iterator.next);
  17     var noInitial = arguments.length < 2;
  18     var accumulator = noInitial ? undefined : arguments[1];
  19     aCallable(reducer);
  20
  21     return new Promise(function (resolve, reject) {
  22       var loop = function () {
  23         try {
  24           Promise.resolve(anObject(call(next, iterator))).then(function (step) {
  25             try {
  26               if (anObject(step).done) {
  27                 noInitial ? reject(TypeError('Reduce of empty iterator with no initial value')) : resolve(accumulator);
  28               } else {
  29                 var value = step.value;
  30                 if (noInitial) {
  31                   noInitial = false;
  32                   accumulator = value;
  33                   loop();
  34                 } else {
  35                   Promise.resolve(reducer(accumulator, value)).then(function (result) {
  36                     accumulator = result;
  37                     loop();
  38                   }, reject);
  39                 }
  40               }
  41             } catch (err) { reject(err); }
  42           }, reject);
  43         } catch (error) { reject(error); }
  44       };
  45
  46       loop();
  47     });
  48   }
  49 });