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diff --git a/‎src/compiler/checker.ts
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+5-1Lines changed: 5 additions & 1 deletion b/‎src/compiler/checker.ts
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+5-1Lines changed: 5 additions & 1 deletion
diff --git a/‎src/compiler/diagnosticMessages.json
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+4Lines changed: 4 additions & 0 deletions b/‎src/compiler/diagnosticMessages.json
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=bundler).errors.txt
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+20Lines changed: 20 additions & 0 deletions b/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=bundler).errors.txt
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=bundler).trace.json
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+827Lines changed: 827 additions & 0 deletions b/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=bundler).trace.json
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=nodenext).trace.json
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+957Lines changed: 957 additions & 0 deletions b/‎tests/baselines/reference/bundlerDirectoryModule(module=node18,moduleresolution=nodenext).trace.json
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).errors.txt renamed to ‎tests/baselines/reference/bundlerDirectoryModule(module=nodenext,moduleresolution=bundler).errors.txt
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(moduleresolution=bundler).trace.json renamed to ‎tests/baselines/reference/bundlerDirectoryModule(module=nodenext,moduleresolution=bundler).trace.json
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diff --git a/‎tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json renamed to ‎tests/baselines/reference/bundlerDirectoryModule(module=nodenext,moduleresolution=nodenext).trace.json
Copy file name to clipboard b/‎tests/baselines/reference/bundlerDirectoryModule(moduleresolution=nodenext).trace.json renamed to ‎tests/baselines/reference/bundlerDirectoryModule(module=nodenext,moduleresolution=nodenext).trace.json
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diff --git a/‎tests/baselines/reference/cjsErrors.errors.txt renamed to ‎tests/baselines/reference/cjsErrors(module=node18).errors.txt
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diff --git a/‎tests/baselines/reference/cjsErrors.js renamed to ‎tests/baselines/reference/cjsErrors(module=node18).js
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@@ -4715,7 +4715,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 if (errorNode && resolvedModule.isExternalLibraryImport && !resolutionExtensionIsTSOrJson(resolvedModule.extension)) {
                     errorOnImplicitAnyModule(/*isError*/ false, errorNode, currentSourceFile, mode, resolvedModule, moduleReference);
                 }
-                if (errorNode && (moduleResolutionKind === ModuleResolutionKind.Node16 || moduleResolutionKind === ModuleResolutionKind.NodeNext)) {
+                if (errorNode && (moduleKind === ModuleKind.Node16 || moduleKind === ModuleKind.Node18)) {
                     const isSyncImport = (currentSourceFile.impliedNodeFormat === ModuleKind.CommonJS && !findAncestor(location, isImportCall)) || !!findAncestor(location, isImportEqualsDeclaration);
                     const overrideHost = findAncestor(location, l => isImportTypeNode(l) || isExportDeclaration(l) || isImportDeclaration(l) || isJSDocImportTag(l));
                     // An override clause will take effect for type-only imports and import types, and allows importing the types across formats, regardless of
@@ -48082,6 +48082,10 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 );
             }
 
+            if (moduleKind === ModuleKind.NodeNext && !isImportAttributes) {
+                return grammarErrorOnFirstToken(node, Diagnostics.Import_assertions_have_been_replaced_by_import_attributes_Use_with_instead_of_asserts);
+            }
+
             if (declaration.moduleSpecifier && getEmitSyntaxForModuleSpecifierExpression(declaration.moduleSpecifier) === ModuleKind.CommonJS) {
                 return grammarErrorOnNode(
                     node,
 
@@ -3980,6 +3980,10 @@
         "category": "Error",
         "code": 2879
     },
+    "Import assertions have been replaced by import attributes. Use 'with' instead of 'asserts'.": {
+        "category": "Error",
+        "code": 2880
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
 
@@ -0,0 +1,20 @@
+error TS5095: Option 'bundler' can only be used when 'module' is set to 'preserve' or to 'es2015' or later.
+error TS5109: Option 'moduleResolution' must be set to 'Node16' (or left unspecified) when option 'module' is set to 'Node18'.
+
+
+!!! error TS5095: Option 'bundler' can only be used when 'module' is set to 'preserve' or to 'es2015' or later.
+!!! error TS5109: Option 'moduleResolution' must be set to 'Node16' (or left unspecified) when option 'module' is set to 'Node18'.
+==== /app/test.ts (0 errors) ====
+    import { test } from '../lib';
+    
+==== /lib/package.json (0 errors) ====
+    {
+      "main": "./cjs/index.js"
+    }
+    
+==== /lib/cjs/index.js (0 errors) ====
+    export function test() {}
+    
+==== /lib/cjs/index.d.ts (0 errors) ====
+    export function test(): void;
+