Merge pull request #14131 from Microsoft/release-2.2_default_import_name

Handle undefined import name

Author: mhegazy

src/services/findAllReferences.ts

@@ -154,7 +154,7 @@ namespace ts.FindAllReferences {
             const importDecl = importSpecifier.parent as ts.ImportDeclaration;
             Debug.assert(importDecl.moduleSpecifier === importSpecifier);
             const defaultName = importDecl.importClause.name;
-            const defaultReferencedSymbol = checker.getAliasedSymbol(checker.getSymbolAtLocation(defaultName));
+            const defaultReferencedSymbol = defaultName && checker.getAliasedSymbol(checker.getSymbolAtLocation(defaultName));
             if (symbol === defaultReferencedSymbol) {
                 return defaultName.text;
             }

tests/cases/fourslash/findAllRefsForDefaultExport.ts

@@ -7,5 +7,8 @@
 ////import [|{| "isWriteAccess": true, "isDefinition": true |}g|] from "./a";
 /////*ref*/[|g|]();
 
+// @Filename: c.ts
+////import { f } from "./a";
+
 verify.singleReferenceGroup("function f(): void");
 verify.goToDefinition("ref", "def");