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