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- 'use strict';
- var $TypeError = require('es-errors/type');
- var IteratorComplete = require('./IteratorComplete');
- var IteratorNext = require('./IteratorNext');
- var isIteratorRecord = require('../helpers/records/iterator-record');
- // https://262.ecma-international.org/16.0/#sec-iteratorstep
- module.exports = function IteratorStep(iteratorRecord) {
- if (!isIteratorRecord(iteratorRecord)) {
- throw new $TypeError('Assertion failed: `iteratorRecord` must be an Iterator Record'); // step 1
- }
- var result = IteratorNext(iteratorRecord); // step 1
- try {
- var done = IteratorComplete(result); // step 2
- } catch (e) { // step 3
- // eslint-disable-next-line no-param-reassign
- iteratorRecord['[[Done]]'] = true; // step 3.a
- throw e; // step 3.b
- }
- if (done) { // step 5
- // eslint-disable-next-line no-param-reassign
- iteratorRecord['[[Done]]'] = true; // step 5.a
- return false; // step 5.b. should be `~done~` but `false` is more convenient here.
- }
- return result; // steps 6
- };
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