fixed missing module resolution errors

Author: Andarist

src/compiler/checker.ts

@@ -46812,6 +46812,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         }
         if (checkExternalImportOrExportDeclaration(node)) {
             const importClause = node.importClause;
+            const moduleExisted = resolveExternalModuleName(node, node.moduleSpecifier);
             if (importClause && !checkGrammarImportClause(importClause)) {
                 if (importClause.name) {
                     checkImportBinding(importClause);
@@ -46824,11 +46825,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                             checkExternalEmitHelpers(node, ExternalEmitHelpers.ImportStar);
                         }
                     }
-                    else {
-                        const moduleExisted = resolveExternalModuleName(node, node.moduleSpecifier);
-                        if (moduleExisted) {
-                            forEach(importClause.namedBindings.elements, checkImportBinding);
-                        }
+                    else if (moduleExisted) {
+                        forEach(importClause.namedBindings.elements, checkImportBinding);
                     }
                 }
             }

tests/baselines/reference/tscWatch/programUpdates/when-changing-`allowImportingTsExtensions`-of-config-file.js

@@ -1,7 +1,7 @@
 currentDirectory:: /user/username/projects/myproject useCaseSensitiveFileNames: false
 Input::
 //// [/user/username/projects/myproject/a.ts]
-
+export {};
 
 //// [/user/username/projects/myproject/b.ts]
 import "./a.ts";
@@ -47,7 +47,12 @@ DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_mod
 Elapsed:: *ms DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_modules/@types 1 undefined Type roots
 DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/node_modules/@types 1 undefined Type roots
 Elapsed:: *ms DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/node_modules/@types 1 undefined Type roots
-[HH:MM:SS AM] Found 0 errors. Watching for file changes.
+b.ts:1:8 - error TS5097: An import path can only end with a '.ts' extension when 'allowImportingTsExtensions' is enabled.
+
+1 import "./a.ts";
+         ~~~~~~~~
+
+[HH:MM:SS AM] Found 1 error. Watching for file changes.
 
 DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject 1 undefined Wild card directory
 Elapsed:: *ms DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject 1 undefined Wild card directory