JS: Replace ad-hoc ExportDeclaration logic with getDirectSourceNode()

Author: asgerf

javascript/ql/lib/semmle/javascript/ApiGraphs.qll

@@ -775,13 +775,7 @@ module API {
         or
         nd = any(DataFlow::CallNode c).getReceiver()
         or
-        nd = DataFlow::valueNode(any(ExportNamedDeclaration decl).getOperand())
-        or
-        nd = DataFlow::valueNode(any(ExportDefaultDeclaration decl).getOperand())
-        or
-        nd = any(ExportNamedDeclaration decl).getOperand().(DeclStmt).getADecl().getInit().flow()
-        or
-        nd = any(ExportNamespaceSpecifier spec | exists(spec.getExportedName())).flow()
+        nd = any(ExportDeclaration decl).getDirectSourceNode(_)
         or
         nd = any(MemberDeclaration m).getInit().flow()
       } or