Fix assertion: class reference location may be 'default' keyword instead of class name (microsoft#21630)

* Fix assertion: class reference location may be 'default' keyword instead of class name

* Update API baselines

Author: Andy

src/compiler/types.ts

@@ -2027,6 +2027,7 @@ namespace ts {
 
     export interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
         kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
         name?: Identifier;
     }
 

src/services/findAllReferences.ts

@@ -990,7 +990,7 @@ namespace ts.FindAllReferences.Core {
         const pusher = () => state.referenceAdder(search.symbol, search.location);
 
         if (isClassLike(referenceLocation.parent)) {
-            Debug.assert(referenceLocation.parent.name === referenceLocation);
+            Debug.assert(referenceLocation.kind === SyntaxKind.DefaultKeyword || referenceLocation.parent.name === referenceLocation);
             // This is the class declaration containing the constructor.
             findOwnConstructorReferences(search.symbol, sourceFile, pusher());
         }

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -1266,6 +1266,7 @@ declare namespace ts {
     }
     interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
         kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
         name?: Identifier;
     }
     interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {

tests/baselines/reference/api/typescript.d.ts

@@ -1266,6 +1266,7 @@ declare namespace ts {
     }
     interface ClassDeclaration extends ClassLikeDeclarationBase, DeclarationStatement {
         kind: SyntaxKind.ClassDeclaration;
+        /** May be undefined in `export default class { ... }`. */
         name?: Identifier;
     }
     interface ClassExpression extends ClassLikeDeclarationBase, PrimaryExpression {

tests/cases/fourslash/findAllRefsExportDefaultClassConstructor.ts

@@ -0,0 +1,5 @@
+////export default class {
+////    [|constructor|]() {}
+////}
+
+verify.singleReferenceGroup("constructor default(): default");