JS: Handle sequence expressions in visitExpression

Author: asgerf

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

@@ -12,6 +12,7 @@
 import com.semmle.js.ast.Node;
 import com.semmle.js.ast.ParenthesizedExpression;
 import com.semmle.js.ast.Program;
+import com.semmle.js.ast.SequenceExpression;
 import com.semmle.js.ast.Statement;
 import com.semmle.js.ast.TryStatement;
 import com.semmle.js.ast.UnaryExpression;
@@ -88,6 +89,11 @@ protected boolean visitExpression(Expression e) {
       if (body instanceof BlockStatement) {
       return visitStatement((BlockStatement) body);
       }
+    } else if (e instanceof SequenceExpression) {
+      SequenceExpression seq = (SequenceExpression) e;
+      for (Expression child : seq.getExpressions()) {
+        if (visitExpression(child)) return true;
+      }
     }
     return false;
   }

javascript/ql/test/library-tests/ModuleTypes/tests.expected

@@ -8,4 +8,4 @@
 | modulePackage/tst.js:1:1:1:75 | <toplevel> | es2015 |
 | require.js:1:1:7:1 | <toplevel> | node |
 | script.js:1:1:1:35 | <toplevel> | non-module |
-| toplevel-comma.js:1:1:5:0 | <toplevel> | non-module |
+| toplevel-comma.js:1:1:5:0 | <toplevel> | node |