JS: Add partial backwards compatibility with ASTNode

javascript/ql/src/semmle/javascript/JSDoc.qll

@@ -42,6 +42,8 @@ abstract class Documentable extends ASTNode {
 class JSDocTypeExprParent extends @jsdoc_type_expr_parent {
   /** Gets a textual representation of this element. */
   string toString() { none() }
+
+  JSDoc getJSDocComment() { none() }
 }
 
 /**
@@ -83,6 +85,10 @@ class JSDocTag extends @jsdoc_tag, JSDocTypeExprParent, Locatable {
 
   /** Gets the toplevel in which this tag appears. */
   TopLevel getTopLevel() { result = getParent().getComment().getTopLevel() }
+
+  override JSDoc getJSDocComment() {
+    result.getATag() = this
+  }
 }
 
 /**
@@ -123,6 +129,20 @@ class JSDocTypeExpr extends @jsdoc_type_expr, JSDocTypeExprParent, TypeAnnotatio
   JSDocTypeExpr getChild(int i) { jsdoc_type_exprs(result, _, this, i, _) }
 
   override string toString() { jsdoc_type_exprs(this, _, _, _, result) }
+
+  override JSDoc getJSDocComment() {
+    result = getParent().getJSDocComment()
+  }
+
+  override Stmt getEnclosingStmt() {
+    result.getDocumentation() = getJSDocComment()
+  }
+
+  override StmtContainer getContainer() { result = getEnclosingStmt().getContainer() }
+  
+  override Function getEnclosingFunction() { result = getContainer() }
+  
+  override TopLevel getTopLevel() { result = getEnclosingStmt().getTopLevel() }
 }
 
 /** An `any` type expression `*`. */

javascript/ql/src/semmle/javascript/TypeAnnotations.qll

@@ -85,4 +85,20 @@ class TypeAnnotation extends @type_annotation {
    * Holds if this is a reference to the type exported from `moduleName` under the name `exportedName`.
    */
   predicate hasQualifiedName(string moduleName, string exportedName) { none() }
+
+  /** Gets the statement in which this type appears. */
+  Stmt getEnclosingStmt() { none() }
+
+  /** Gets the function in which this type appears, if any. */
+  Function getEnclosingFunction() { none() }
+
+  /**
+   * Gets the statement container (function or toplevel) in which this type appears.
+   */
+  StmtContainer getContainer() { none() }
+
+  /**
+   * Gets the top-level containing this type annotation.
+   */
+  TopLevel getTopLevel() { none() }
 }

javascript/ql/src/semmle/javascript/TypeScript.qll

@@ -540,6 +540,14 @@ class TypeExpr extends ExprOrType, @typeexpr, TypeAnnotation {
    * without type information.
    */
   Type getType() { ast_node_type(this, result) }
+  
+  override Stmt getEnclosingStmt() { result = ExprOrType.super.getEnclosingStmt() }
+  
+  override Function getEnclosingFunction() { result = ExprOrType.super.getEnclosingFunction() }
+  
+  override StmtContainer getContainer() { result = ExprOrType.super.getContainer() }
+  
+  override TopLevel getTopLevel() { result = ExprOrType.super.getTopLevel() }
 }
 
 /**