getContainingList: Handle TypeAliasDeclaration (#25614)

* getContainingList: Handle TypeAliasDeclaration

* Handle ClassExpression and InterfaceDeclaration

Author: Andy

src/services/formatting/smartIndenter.ts

@@ -351,7 +351,10 @@ namespace ts.formatting {
                             getListIfStartEndIsInListRange((<SignatureDeclaration>node.parent).parameters, start, end);
                     }
                     case SyntaxKind.ClassDeclaration:
-                        return getListIfStartEndIsInListRange((<ClassDeclaration>node.parent).typeParameters, node.getStart(sourceFile), end);
+                    case SyntaxKind.ClassExpression:
+                    case SyntaxKind.InterfaceDeclaration:
+                    case SyntaxKind.TypeAliasDeclaration:
+                        return getListIfStartEndIsInListRange((<ClassDeclaration | ClassExpression | InterfaceDeclaration | TypeAliasDeclaration>node.parent).typeParameters, node.getStart(sourceFile), end);
                     case SyntaxKind.NewExpression:
                     case SyntaxKind.CallExpression: {
                         const start = node.getStart(sourceFile);

tests/cases/fourslash/codeFixUnusedIdentifier_all_delete.ts

@@ -37,6 +37,10 @@
 ////for (let i = 0, j = 0; ;) {}
 ////for (const x of []) {}
 ////for (const y in {}) {}
+////
+////export type First<T, U> = T;
+////export interface ISecond<T, U> { u: U; }
+////export const cls = class<T, U> { u: U; };
 
 verify.codeFixAll({
     fixId: "unusedIdentifier_delete",
@@ -70,5 +74,9 @@ takesCb((x, y) => { y; });
 }
 for (; ;) {}
 for (const {} of []) {}
-for (const {} in {}) {}`,
+for (const {} in {}) {}
+
+export type First<T> = T;
+export interface ISecond<U> { u: U; }
+export const cls = class<U> { u: U; };`,
 });