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