Mark @typedef as a type declaration

This is only important right now for marking uses of deprecated tags due
to the way that deprecated type references are computed. But I'm
surprised it hasn't caused problems elsewhere.

Fixes #39466

Author: sandersn

src/compiler/checker.ts

@@ -36110,13 +36110,14 @@ namespace ts {
                 name.parent.name === name;
         }
 
-        function isTypeDeclaration(node: Node): node is TypeParameterDeclaration | ClassDeclaration | InterfaceDeclaration | TypeAliasDeclaration | EnumDeclaration | ImportClause | ImportSpecifier | ExportSpecifier {
+        function isTypeDeclaration(node: Node): node is TypeParameterDeclaration | ClassDeclaration | InterfaceDeclaration | TypeAliasDeclaration | JSDocTypedefTag | EnumDeclaration | ImportClause | ImportSpecifier | ExportSpecifier {
             switch (node.kind) {
                 case SyntaxKind.TypeParameter:
                 case SyntaxKind.ClassDeclaration:
                 case SyntaxKind.InterfaceDeclaration:
                 case SyntaxKind.TypeAliasDeclaration:
                 case SyntaxKind.EnumDeclaration:
+                case SyntaxKind.JSDocTypedefTag:
                     return true;
                 case SyntaxKind.ImportClause:
                     return (node as ImportClause).isTypeOnly;

tests/cases/fourslash/jsdocDeprecated_suggestion5.ts

@@ -0,0 +1,10 @@
+///<reference path="fourslash.ts" />
+
+// @checkJs: true
+// @allowJs: true
+// @Filename: jsdocDeprecated_suggestion5.js
+//// /** @typedef {{ email: string, nickName?: string }} U2 */
+//// /** @type {U2} */
+//// const u2 = { email: "" }
+
+verify.getSuggestionDiagnostics([])