add support for private fields in classes

javascript/ql/test/library-tests/Classes/ClassFlow.qll

@@ -0,0 +1,17 @@
+import javascript
+
+class Configuration extends DataFlow::Configuration {
+  Configuration() { this = "ClassDataFlowTestingConfig" }
+
+  override predicate isSource(DataFlow::Node source) {
+    source.getEnclosingExpr().(StringLiteral).getValue().toLowerCase() = "source"
+  }
+
+  override predicate isSink(DataFlow::Node sink) {
+    any(DataFlow::CallNode call | call.getCalleeName() = "sink").getAnArgument() = sink
+  }
+}
+
+query predicate dataflow(DataFlow::Node pred, DataFlow::Node succ) {
+  any(Configuration c).hasFlow(pred, succ)
+}