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- 'use strict';
- var $TypeError = require('es-errors/type');
- var GeneratorStart = require('./GeneratorStart');
- var IsArray = require('es-abstract/2023/IsArray');
- var IsCallable = require('es-abstract/2023/IsCallable');
- var OrdinaryObjectCreate = require('es-abstract/2023/OrdinaryObjectCreate');
- var every = require('es-abstract/helpers/every');
- var SLOT = require('internal-slot');
- var safeConcat = require('safe-array-concat');
- var isString = function isString(slot) {
- return typeof slot === 'string';
- };
- module.exports = function CreateIteratorFromClosure(closure, generatorBrand, proto) {
- if (!IsCallable(closure)) {
- throw new $TypeError('`closure` must be a function');
- }
- if (typeof generatorBrand !== 'string') {
- throw new $TypeError('`generatorBrand` must be a string');
- }
- var extraSlots = arguments.length > 3 ? arguments[3] : [];
- if (arguments.length > 3) {
- if (!IsArray(extraSlots) || !every(extraSlots, isString)) {
- throw new $TypeError('`extraSlots` must be a List of String internal slot names');
- }
- }
- var internalSlotsList = safeConcat(extraSlots, ['[[GeneratorContext]]', '[[GeneratorBrand]]', '[[GeneratorState]]']); // step 3
- var generator = OrdinaryObjectCreate(proto, internalSlotsList); // steps 4, 6
- SLOT.set(generator, '[[GeneratorBrand]]', generatorBrand); // step 5
- SLOT.assert(closure, '[[Sentinel]]'); // our userland slot
- SLOT.set(generator, '[[Sentinel]]', SLOT.get(closure, '[[Sentinel]]')); // our userland slot
- SLOT.assert(closure, '[[CloseIfAbrupt]]'); // our second userland slot
- SLOT.set(generator, '[[CloseIfAbrupt]]', SLOT.get(closure, '[[CloseIfAbrupt]]')); // our second userland slot
- GeneratorStart(generator, closure); // step 13
- return generator; // step 15
- };
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