Add parent types to class elements

src/compiler/types.ts

@@ -815,18 +815,21 @@ namespace ts {
 
     export interface ConstructorDeclaration extends FunctionLikeDeclaration, ClassElement {
         kind: SyntaxKind.Constructor;
+        parent?: ClassDeclaration | ClassExpression;
         body?: FunctionBody;
     }
 
     // For when we encounter a semicolon in a class declaration.  ES6 allows these as class elements.
     export interface SemicolonClassElement extends ClassElement {
         kind: SyntaxKind.SemicolonClassElement;
+        parent?: ClassDeclaration | ClassExpression;
     }
 
     // See the comment on MethodDeclaration for the intuition behind GetAccessorDeclaration being a
     // ClassElement and an ObjectLiteralElement.
     export interface GetAccessorDeclaration extends FunctionLikeDeclaration, ClassElement, ObjectLiteralElement {
         kind: SyntaxKind.GetAccessor;
+        parent?: ClassDeclaration | ClassExpression | ObjectLiteralExpression;
         name: PropertyName;
         body: FunctionBody;
     }
@@ -835,6 +838,7 @@ namespace ts {
     // ClassElement and an ObjectLiteralElement.
     export interface SetAccessorDeclaration extends FunctionLikeDeclaration, ClassElement, ObjectLiteralElement {
         kind: SyntaxKind.SetAccessor;
+        parent?: ClassDeclaration | ClassExpression | ObjectLiteralExpression;
         name: PropertyName;
         body: FunctionBody;
     }
@@ -843,6 +847,7 @@ namespace ts {
 
     export interface IndexSignatureDeclaration extends SignatureDeclaration, ClassElement, TypeElement {
         kind: SyntaxKind.IndexSignature;
+        parent?: ClassDeclaration | ClassExpression | InterfaceDeclaration | TypeLiteralNode;
     }
 
     export interface TypeNode extends Node {
@@ -937,6 +942,7 @@ namespace ts {
 
     export interface MappedTypeNode extends TypeNode, Declaration {
         kind: SyntaxKind.MappedType;
+        parent?: TypeAliasDeclaration;
         readonlyToken?: ReadonlyToken;
         typeParameter: TypeParameterDeclaration;
         questionToken?: QuestionToken;