fix(49629): fix crash in find-all-refs when using module.exports/export= with arrays/primitives (#50291)

Author: a-tarasyuk

src/services/importTracker.ts

@@ -555,6 +555,7 @@ namespace ts.FindAllReferences {
             // Similarly, skip past the symbol for 'export ='
             if (importedSymbol.escapedName === "export=") {
                 importedSymbol = getExportEqualsLocalSymbol(importedSymbol, checker);
+                if (importedSymbol === undefined) return undefined;
             }
 
             // If the import has a different name than the export, do not continue searching.
@@ -577,22 +578,22 @@ namespace ts.FindAllReferences {
         }
     }
 
-    function getExportEqualsLocalSymbol(importedSymbol: Symbol, checker: TypeChecker): Symbol {
+    function getExportEqualsLocalSymbol(importedSymbol: Symbol, checker: TypeChecker): Symbol | undefined {
         if (importedSymbol.flags & SymbolFlags.Alias) {
-            return Debug.checkDefined(checker.getImmediateAliasedSymbol(importedSymbol));
+            return checker.getImmediateAliasedSymbol(importedSymbol);
         }
 
         const decl = Debug.checkDefined(importedSymbol.valueDeclaration);
         if (isExportAssignment(decl)) { // `export = class {}`
-            return Debug.checkDefined(decl.expression.symbol);
+            return decl.expression.symbol;
         }
         else if (isBinaryExpression(decl)) { // `module.exports = class {}`
-            return Debug.checkDefined(decl.right.symbol);
+            return decl.right.symbol;
         }
         else if (isSourceFile(decl)) { // json module
-            return Debug.checkDefined(decl.symbol);
+            return decl.symbol;
         }
-        return Debug.fail();
+        return undefined;
     }
 
     // If a reference is a class expression, the exported node would be its parent.