.config/coc/extensions/node_modules/coc-prettier/node_modules/core-js/modules/esnext.iterator.flat-map.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 getIteratorMethod = require('../internals/get-iterator-method');
   9 var createIteratorProxy = require('../internals/iterator-create-proxy');
  10 var iteratorClose = require('../internals/iterator-close');
  11
  12 var TypeError = global.TypeError;
  13
  14 var IteratorProxy = createIteratorProxy(function () {
  15   var iterator = this.iterator;
  16   var mapper = this.mapper;
  17   var result, mapped, iteratorMethod, innerIterator;
  18
  19   while (true) {
  20     try {
  21       if (innerIterator = this.innerIterator) {
  22         result = anObject(call(this.innerNext, innerIterator));
  23         if (!result.done) return result.value;
  24         this.innerIterator = this.innerNext = null;
  25       }
  26
  27       result = anObject(call(this.next, iterator));
  28
  29       if (this.done = !!result.done) return;
  30
  31       mapped = mapper(result.value);
  32       iteratorMethod = getIteratorMethod(mapped);
  33
  34       if (!iteratorMethod) {
  35         throw TypeError('.flatMap callback should return an iterable object');
  36       }
  37
  38       this.innerIterator = innerIterator = anObject(call(iteratorMethod, mapped));
  39       this.innerNext = aCallable(innerIterator.next);
  40     } catch (error) {
  41       iteratorClose(iterator, 'throw', error);
  42     }
  43   }
  44 });
  45
  46 $({ target: 'Iterator', proto: true, real: true }, {
  47   flatMap: function flatMap(mapper) {
  48     return new IteratorProxy({
  49       iterator: anObject(this),
  50       mapper: aCallable(mapper),
  51       innerIterator: null,
  52       innerNext: null
  53     });
  54   }
  55 });