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