diff --git a/packages/language-server/src/plugins/typescript/SnapshotManager.ts b/packages/language-server/src/plugins/typescript/SnapshotManager.ts
index 8b95b2a5f..d7b19c0ce 100644
--- a/packages/language-server/src/plugins/typescript/SnapshotManager.ts
+++ b/packages/language-server/src/plugins/typescript/SnapshotManager.ts
@@ -48,6 +48,7 @@ export class GlobalSnapshotsManager {
                 return;
             }
             previousSnapshot.update(changes);
+            this.emitter.emit('change', fileName, previousSnapshot);
             return previousSnapshot;
         } else {
             const newSnapshot = DocumentSnapshot.fromNonSvelteFilePath(fileName);
diff --git a/packages/language-server/src/plugins/typescript/service.ts b/packages/language-server/src/plugins/typescript/service.ts
index dfa2f0ea7..008ae99fc 100644
--- a/packages/language-server/src/plugins/typescript/service.ts
+++ b/packages/language-server/src/plugins/typescript/service.ts
@@ -127,6 +127,7 @@ async function createLanguageService(
     ].map((f) => ts.sys.resolvePath(resolve(svelteTsPath, f)));
 
     let languageServiceReducedMode = false;
+    let projectVersion = 0;
 
     const host: ts.LanguageServiceHost = {
         getCompilationSettings: () => compilerOptions,
@@ -148,13 +149,19 @@ async function createLanguageService(
         readDirectory: svelteModuleLoader.readDirectory,
         getDirectories: ts.sys.getDirectories,
         useCaseSensitiveFileNames: () => ts.sys.useCaseSensitiveFileNames,
-        getScriptKind: (fileName: string) => getSnapshot(fileName).scriptKind
+        getScriptKind: (fileName: string) => getSnapshot(fileName).scriptKind,
+        getProjectVersion: () => projectVersion.toString()
     };
+
     let languageService = ts.createLanguageService(host);
     const transformationConfig = {
         transformOnTemplateError: docContext.transformOnTemplateError
     };
 
+    docContext.globalSnapshotsManager.onChange(() => {
+        projectVersion++;
+    });
+
     reduceLanguageServiceCapabilityIfFileSizeTooBig();
 
     return {
@@ -239,6 +246,7 @@ async function createLanguageService(
     }
 
     function updateProjectFiles(): void {
+        projectVersion++;
         const projectFileCountBefore = snapshotManager.getProjectFileNames().length;
         snapshotManager.updateProjectFiles();
         const projectFileCountAfter = snapshotManager.getProjectFileNames().length;
diff --git a/packages/language-server/test/plugins/typescript/features/DiagnosticsProvider.test.ts b/packages/language-server/test/plugins/typescript/features/DiagnosticsProvider.test.ts
index c3b9ffe84..959368aa0 100644
--- a/packages/language-server/test/plugins/typescript/features/DiagnosticsProvider.test.ts
+++ b/packages/language-server/test/plugins/typescript/features/DiagnosticsProvider.test.ts
@@ -1023,6 +1023,32 @@ describe('DiagnosticsProvider', () => {
         assert.deepStrictEqual(diagnostics3.length, 1);
     }).timeout(5000);
 
+    it('notices update of imported module', async () => {
+        const { plugin, document, lsAndTsDocResolver } = setup(
+            'diagnostics-imported-js-update.svelte'
+        );
+
+        const newFilePath = normalizePath(path.join(testDir, 'empty-export.ts')) || '';
+        await lsAndTsDocResolver.getSnapshot(newFilePath);
+
+        const diagnostics1 = await plugin.getDiagnostics(document);
+        assert.deepStrictEqual(
+            diagnostics1[0]?.message,
+            "Module '\"./empty-export\"' has no exported member 'foo'."
+        );
+
+        await lsAndTsDocResolver.updateExistingTsOrJsFile(newFilePath, [
+            {
+                range: { start: { line: 0, character: 0 }, end: { line: 0, character: 0 } },
+                text: 'export function foo() {}'
+            }
+        ]);
+
+        const diagnostics2 = await plugin.getDiagnostics(document);
+        assert.deepStrictEqual(diagnostics2.length, 0);
+        await lsAndTsDocResolver.deleteSnapshot(newFilePath);
+    }).timeout(5000);
+
     it('notices file changes in all services that reference that file', async () => {
         const { plugin, document, docManager, lsAndTsDocResolver } = setup(
             'different-ts-service.svelte'
diff --git a/packages/language-server/test/plugins/typescript/testfiles/diagnostics/diagnostics-imported-js-update.svelte b/packages/language-server/test/plugins/typescript/testfiles/diagnostics/diagnostics-imported-js-update.svelte
new file mode 100644
index 000000000..7882f3b5f
--- /dev/null
+++ b/packages/language-server/test/plugins/typescript/testfiles/diagnostics/diagnostics-imported-js-update.svelte
@@ -0,0 +1,5 @@
+<script lang="ts">
+    import { foo } from './empty-export'
+
+    foo;
+</script>
\ No newline at end of file
diff --git a/packages/language-server/test/plugins/typescript/testfiles/diagnostics/empty-export.ts b/packages/language-server/test/plugins/typescript/testfiles/diagnostics/empty-export.ts
new file mode 100644
index 000000000..8cec2e9ce
--- /dev/null
+++ b/packages/language-server/test/plugins/typescript/testfiles/diagnostics/empty-export.ts
@@ -0,0 +1 @@
+export {};
\ No newline at end of file