diff --git a/packages/codemirror/src/extensions/custom_tab.ts b/packages/codemirror/src/extensions/custom_tab.ts
index 2355ce90f..c8ced1df2 100644
--- a/packages/codemirror/src/extensions/custom_tab.ts
+++ b/packages/codemirror/src/extensions/custom_tab.ts
@@ -1,5 +1,5 @@
 import { indentLess, indentMore } from "@codemirror/commands";
-import { EditorSelection, EditorState, type ChangeSpec } from "@codemirror/state";
+import { EditorSelection, EditorState, SelectionRange, type ChangeSpec } from "@codemirror/state";
 import type { KeyBinding } from "@codemirror/view";
 
 /**
@@ -19,8 +19,8 @@ const smartIndentWithTab: KeyBinding[] = [
             }
 
             const { selection } = state;
-            const changes = [];
-            const newSelections = [];
+            const changes: ChangeSpec[] = [];
+            const newSelections: SelectionRange[] = [];
 
             // Step 1: Handle non-empty selections → replace with tab
             if (selection.ranges.some(range => !range.empty)) {
diff --git a/packages/codemirror/tsconfig.spec.json b/packages/codemirror/tsconfig.spec.json
index fbd68ed60..f7f4942ed 100644
--- a/packages/codemirror/tsconfig.spec.json
+++ b/packages/codemirror/tsconfig.spec.json
@@ -23,6 +23,6 @@
     "src/**/*.spec.js",
     "src/**/*.test.jsx",
     "src/**/*.spec.jsx",
-    "src/**/*.d.ts"
+    "src/**/*.ts"
   ]
 }