diff --git a/packages/language-server/src/plugins/typescript/service.ts b/packages/language-server/src/plugins/typescript/service.ts
index 9ae3a31d2..06a5c2a51 100644
--- a/packages/language-server/src/plugins/typescript/service.ts
+++ b/packages/language-server/src/plugins/typescript/service.ts
@@ -228,7 +228,16 @@ async function createLanguageService(
             forcedCompilerOptions,
             tsconfigPath,
             undefined,
-            [{ extension: 'svelte', isMixedContent: false, scriptKind: ts.ScriptKind.TSX }]
+            [
+                {
+                    extension: 'svelte',
+                    isMixedContent: true,
+                    // Deferred was added in a later TS version, fall back to tsx
+                    // If Deferred exists, this means that all Svelte files are included
+                    // in parsedConfig.fileNames
+                    scriptKind: ts.ScriptKind.Deferred ?? ts.ScriptKind.TSX
+                }
+            ]
         );
 
         const compilerOptions: ts.CompilerOptions = {
diff --git a/packages/language-server/test/plugins/typescript/features/CompletionProvider.test.ts b/packages/language-server/test/plugins/typescript/features/CompletionProvider.test.ts
index ebc3c4c46..a1a79e21a 100644
--- a/packages/language-server/test/plugins/typescript/features/CompletionProvider.test.ts
+++ b/packages/language-server/test/plugins/typescript/features/CompletionProvider.test.ts
@@ -606,12 +606,12 @@ describe.only('CompletionProviderImpl', () => {
             item!
         );
 
-        assert.strictEqual(detail, 'Auto import from ./imported-file.svelte\nclass ImportedFile');
+        assert.strictEqual(detail, 'Auto import from ../imported-file.svelte\nclass ImportedFile');
 
         assert.strictEqual(
             harmonizeNewLines(additionalTextEdits![0]?.newText),
             // " instead of ' because VSCode uses " by default when there are no other imports indicating otherwise
-            `${newLine}import ImportedFile from "./imported-file.svelte";${newLine}`
+            `${newLine}import ImportedFile from "../imported-file.svelte";${newLine}`
         );
 
         assert.deepEqual(
@@ -641,12 +641,12 @@ describe.only('CompletionProviderImpl', () => {
             item!
         );
 
-        assert.strictEqual(detail, 'Auto import from ./imported-file.svelte\nclass ImportedFile');
+        assert.strictEqual(detail, 'Auto import from ../imported-file.svelte\nclass ImportedFile');
 
         assert.strictEqual(
             harmonizeNewLines(additionalTextEdits![0]?.newText),
             // " instead of ' because VSCode uses " by default when there are no other imports indicating otherwise
-            `<script>${newLine}import ImportedFile from "./imported-file.svelte";` +
+            `<script>${newLine}import ImportedFile from "../imported-file.svelte";` +
                 `${newLine}${newLine}</script>${newLine}`
         );