support top-level for await statements

Author: erik-krogh

javascript/extractor/src/com/semmle/jcorn/ESNextParser.java

@@ -448,7 +448,11 @@ private DynamicImport parseDynamicImport(Position startLoc) {
   protected Statement parseForStatement(Position startLoc) {
     int startPos = this.start;
     boolean isAwait = false;
-    if (this.inAsync && this.eatContextual("await")) isAwait = true;
+    if (this.inAsync || (options.esnext() && !this.inFunction)) {
+        if (this.eatContextual("await")) {
+          isAwait = true;
+        }
+    }
     Statement forStmt = super.parseForStatement(startLoc);
     if (isAwait) {
       if (forStmt instanceof ForOfStatement) ((ForOfStatement) forStmt).setAwait(true);

javascript/extractor/src/com/semmle/js/extractor/Main.java

@@ -41,7 +41,7 @@ public class Main {
    * A version identifier that should be updated every time the extractor changes in such a way that
    * it may produce different tuples for the same file under the same {@link ExtractorConfig}.
    */
-  public static final String EXTRACTOR_VERSION = "2022-06-27";
+  public static final String EXTRACTOR_VERSION = "2022-07-11";
 
   public static final Pattern NEWLINE = Pattern.compile("\n");
 

javascript/extractor/tests/esnext/input/for-await.js

@@ -0,0 +1,9 @@
+async function foo() {
+    for await (const call of calls) {
+        call();    
+    }
+}
+
+for await (const call of calls) {
+    call();
+}