use some Sanitizer classes that were unused in the query code

javascript/ql/lib/semmle/javascript/security/dataflow/DeepObjectResourceExhaustionQuery.qll

@@ -26,6 +26,11 @@ class Configuration extends TaintTracking::Configuration {
     guard instanceof TaintedObject::SanitizerGuard
   }
 
+  override predicate isSanitizer(DataFlow::Node node) {
+    super.isSanitizer(node) or
+    node instanceof Sanitizer
+  }
+
   override predicate isAdditionalFlowStep(
     DataFlow::Node src, DataFlow::Node trg, DataFlow::FlowLabel inlbl, DataFlow::FlowLabel outlbl
   ) {

javascript/ql/lib/semmle/javascript/security/dataflow/HardcodedCredentialsQuery.qll

@@ -19,6 +19,11 @@ class Configuration extends DataFlow::Configuration {
 
   override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
 
+  override predicate isBarrier(DataFlow::Node node) {
+    super.isBarrier(node) or
+    node instanceof Sanitizer
+  }
+
   override predicate isAdditionalFlowStep(DataFlow::Node src, DataFlow::Node trg) {
     exists(Base64::Encode encode | src = encode.getInput() and trg = encode.getOutput())
     or

javascript/ql/lib/semmle/javascript/security/dataflow/InsecureDownloadQuery.qll

@@ -31,4 +31,9 @@ class Configuration extends DataFlow::Configuration {
   override predicate isSink(DataFlow::Node sink, DataFlow::FlowLabel label) {
     sink.(Sink).getALabel() = label
   }
+
+  override predicate isBarrier(DataFlow::Node node) {
+    super.isBarrier(node) or
+    node instanceof Sanitizer
+  }
 }

javascript/ql/lib/semmle/javascript/security/dataflow/UnvalidatedDynamicMethodCallCustomizations.qll

@@ -34,6 +34,8 @@ module UnvalidatedDynamicMethodCall {
 
   /**
    * A sanitizer for unvalidated dynamic method calls.
+   * Override the `sanitizes` predicate to specify an edge that should be sanitized.
+   * The `this` value is not seen as a sanitizer.
    */
   abstract class Sanitizer extends DataFlow::Node {
     abstract predicate sanitizes(DataFlow::Node source, DataFlow::Node sink, DataFlow::FlowLabel lbl);

javascript/ql/lib/semmle/javascript/security/dataflow/UnvalidatedDynamicMethodCallQuery.qll

@@ -38,7 +38,11 @@ class Configuration extends TaintTracking::Configuration {
     sink.(Sink).getFlowLabel() = label
   }
 
-  override predicate isSanitizer(DataFlow::Node nd) { super.isSanitizer(nd) }
+  override predicate isSanitizerEdge(
+    DataFlow::Node pred, DataFlow::Node succ, DataFlow::FlowLabel lbl
+  ) {
+    any(Sanitizer s).sanitizes(pred, succ, lbl)
+  }
 
   override predicate isSanitizerGuard(TaintTracking::SanitizerGuardNode guard) {
     guard instanceof NumberGuard or

javascript/ql/src/experimental/semmle/javascript/security/dataflow/ResourceExhaustion.qll

@@ -23,6 +23,11 @@ module ResourceExhaustion {
 
     override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
 
+    override predicate isSanitizer(DataFlow::Node node) {
+      super.isSanitizer(node) or
+      node instanceof Sanitizer
+    }
+
     override predicate isAdditionalTaintStep(DataFlow::Node src, DataFlow::Node dst) {
       isNumericFlowStep(src, dst)
       or