JS: Use in MissingAwait

Author: asgerf

javascript/ql/src/Expressions/MissingAwait.ql

@@ -10,6 +10,7 @@
  */
 
 import javascript
+private import semmle.javascript.internal.TypeResolution
 
 /**
  * Holds if `call` is a call to an `async` function.
@@ -28,7 +29,7 @@ predicate isPromise(DataFlow::SourceNode node, boolean nullable) {
   isAsyncCall(node, nullable)
   or
   not isAsyncCall(node, _) and
-  node.asExpr().getType() instanceof PromiseType and
+  TypeResolution::valueHasPromiseType(node.asExpr()) and
   nullable = true
 }