Normative: make async iterators next/return/throw not pass `undefined…

…` when value is absent (tc39#1776)
ljharb · Apr 2, 2020 · 7abcd0a · 7abcd0a
1 parent 980e1cc
commit 7abcd0a
Showing 1 changed file with 12 additions and 3 deletions.
diff --git a/spec.html b/spec.html
@@ -38846,7 +38846,10 @@ <h1>%AsyncFromSyncIteratorPrototype%.next ( _value_ )</h1>
             1. Assert: Type(_O_) is Object and _O_ has a [[SyncIteratorRecord]] internal slot.
             1. Let _promiseCapability_ be ! NewPromiseCapability(%Promise%).
             1. Let _syncIteratorRecord_ be _O_.[[SyncIteratorRecord]].
-            1. Let _result_ be IteratorNext(_syncIteratorRecord_, _value_).
+            1. If _value_ is present, then
+              1. Let _result_ be IteratorNext(_syncIteratorRecord_, _value_).
+            1. Else,
+              1. Let _result_ be IteratorNext(_syncIteratorRecord_).
             1. IfAbruptRejectPromise(_result_, _promiseCapability_).
             1. Return ! AsyncFromSyncIteratorContinuation(_result_, _promiseCapability_).
           </emu-alg>
@@ -38866,7 +38869,10 @@ <h1>%AsyncFromSyncIteratorPrototype%.return ( _value_ )</h1>
               1. Let _iterResult_ be ! CreateIterResultObject(_value_, *true*).
               1. Perform ! Call(_promiseCapability_.[[Resolve]], *undefined*, &laquo; _iterResult_ &raquo;).
               1. Return _promiseCapability_.[[Promise]].
-            1. Let _result_ be Call(_return_, _syncIterator_, &laquo; _value_ &raquo;).
+            1. If _value_ is present, then
+              1. Let _result_ be Call(_return_, _syncIterator_, &laquo; _value_ &raquo;).
+            1. Else,
+              1. Let _result_ be Call(_return_, _syncIterator_).
             1. IfAbruptRejectPromise(_result_, _promiseCapability_).
             1. If Type(_result_) is not Object, then
               1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, &laquo; a newly created *TypeError* object &raquo;).
@@ -38888,7 +38894,10 @@ <h1>%AsyncFromSyncIteratorPrototype%.throw ( _value_ )</h1>
             1. If _throw_ is *undefined*, then
               1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, &laquo; _value_ &raquo;).
               1. Return _promiseCapability_.[[Promise]].
-            1. Let _result_ be Call(_throw_, _syncIterator_, &laquo; _value_ &raquo;).
+            1. If _value_ is present, then
+              1. Let _result_ be Call(_throw_, _syncIterator_, &laquo; _value_ &raquo;).
+            1. Else,
+              1. Let _result_ be Call(_throw_, _syncIterator_).
             1. IfAbruptRejectPromise(_result_, _promiseCapability_).
             1. If Type(_result_) is not Object, then
               1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, &laquo; a newly created *TypeError* object &raquo;).