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Edit File: IteratorClose.js

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $TypeError = GetIntrinsic('%TypeError%');

var Call = require('./Call');
var GetMethod = require('./GetMethod');
var IsCallable = require('./IsCallable');
var Type = require('./Type');

// https://ecma-international.org/ecma-262/6.0/#sec-iteratorclose

module.exports = function IteratorClose(iterator, completion) {
	if (Type(iterator) !== 'Object') {
		throw new $TypeError('Assertion failed: Type(iterator) is not Object');
	}
	if (!IsCallable(completion)) {
		throw new $TypeError('Assertion failed: completion is not a thunk for a Completion Record');
	}
	var completionThunk = completion;

var iteratorReturn = GetMethod(iterator, 'return');

if (typeof iteratorReturn === 'undefined') {
		return completionThunk();
	}

var completionRecord;
	try {
		var innerResult = Call(iteratorReturn, iterator, []);
	} catch (e) {
		// if we hit here, then "e" is the innerResult completion that needs re-throwing

// if the completion is of type "throw", this will throw.
		completionThunk();
		completionThunk = null; // ensure it's not called twice.

// if not, then return the innerResult completion
		throw e;
	}
	completionRecord = completionThunk(); // if innerResult worked, then throw if the completion does
	completionThunk = null; // ensure it's not called twice.

if (Type(innerResult) !== 'Object') {
		throw new $TypeError('iterator .return must return an object');
	}

return completionRecord;
};

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