| 'use strict'; | 
|   | 
| var GetIntrinsic = require('get-intrinsic'); | 
|   | 
| var $TypeError = GetIntrinsic('%TypeError%'); | 
|   | 
| var Call = require('./Call'); | 
| var CompletionRecord = require('./CompletionRecord'); | 
| 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) && !(completion instanceof CompletionRecord)) { | 
|         throw new $TypeError('Assertion failed: completion is not a thunk representing a Completion Record, nor a Completion Record instance'); | 
|     } | 
|     var completionThunk = completion instanceof CompletionRecord ? function () { return completion['?'](); } : 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; | 
| }; |