JS: Factor TNode into a separate file

javascript/ql/src/semmle/javascript/dataflow/DataFlow.qll

@@ -21,32 +21,9 @@
 import javascript
 private import internal.CallGraphs
 private import internal.FlowSteps as FlowSteps
+private import internal.DataFlowNode
 
 module DataFlow {
-  cached
-  private newtype TNode =
-    TValueNode(AST::ValueNode nd) or
-    TSsaDefNode(SsaDefinition d) or
-    TCapturedVariableNode(LocalVariable v) { v.isCaptured() } or
-    TPropNode(@property p) or
-    TRestPatternNode(DestructuringPattern dp, Expr rest) { rest = dp.getRest() } or
-    TDestructuringPatternNode(DestructuringPattern dp) or
-    TElementPatternNode(ArrayPattern ap, Expr p) { p = ap.getElement(_) } or
-    TElementNode(ArrayExpr arr, Expr e) { e = arr.getAnElement() } or
-    TReflectiveCallNode(MethodCallExpr ce, string kind) {
-      ce.getMethodName() = kind and
-      (kind = "call" or kind = "apply")
-    } or
-    TThisNode(StmtContainer f) { f.(Function).getThisBinder() = f or f instanceof TopLevel } or
-    TUnusedParameterNode(SimpleParameter p) { not exists(SSA::definition(p)) } or
-    TDestructuredModuleImportNode(ImportDeclaration decl) {
-      exists(decl.getASpecifier().getImportedName())
-    } or
-    THtmlAttributeNode(HTML::Attribute attr) or
-    TExceptionalFunctionReturnNode(Function f) or
-    TExceptionalInvocationReturnNode(InvokeExpr e) or
-    TGlobalAccessPathRoot()
-
   /**
    * A node in the data flow graph.
    */

javascript/ql/src/semmle/javascript/dataflow/internal/DataFlowNode.qll

@@ -0,0 +1,33 @@
+/**
+ * INTERNAL: Do not use outside the data flow library.
+ *
+ * Contains the raw data type underlying `DataFlow::Node`.
+ */
+private import javascript
+
+/**
+ * The raw data type underlying `DataFlow::Node`.
+ */
+cached
+newtype TNode =
+  TValueNode(AST::ValueNode nd) or
+  TSsaDefNode(SsaDefinition d) or
+  TCapturedVariableNode(LocalVariable v) { v.isCaptured() } or
+  TPropNode(@property p) or
+  TRestPatternNode(DestructuringPattern dp, Expr rest) { rest = dp.getRest() } or
+  TDestructuringPatternNode(DestructuringPattern dp) or
+  TElementPatternNode(ArrayPattern ap, Expr p) { p = ap.getElement(_) } or
+  TElementNode(ArrayExpr arr, Expr e) { e = arr.getAnElement() } or
+  TReflectiveCallNode(MethodCallExpr ce, string kind) {
+    ce.getMethodName() = kind and
+    (kind = "call" or kind = "apply")
+  } or
+  TThisNode(StmtContainer f) { f.(Function).getThisBinder() = f or f instanceof TopLevel } or
+  TUnusedParameterNode(SimpleParameter p) { not exists(SSA::definition(p)) } or
+  TDestructuredModuleImportNode(ImportDeclaration decl) {
+    exists(decl.getASpecifier().getImportedName())
+  } or
+  THtmlAttributeNode(HTML::Attribute attr) or
+  TExceptionalFunctionReturnNode(Function f) or
+  TExceptionalInvocationReturnNode(InvokeExpr e) or
+  TGlobalAccessPathRoot()