diff --git a/packages/frontend-core/src/components/grid/stores/rows.ts b/packages/frontend-core/src/components/grid/stores/rows.ts
index 7082b9fd03..f494bf51ae 100644
--- a/packages/frontend-core/src/components/grid/stores/rows.ts
+++ b/packages/frontend-core/src/components/grid/stores/rows.ts
@@ -423,7 +423,7 @@ export const createActions = (context: StoreContext): RowActionStore => {
     // Add to state
     if (saved.length) {
       rows.update(state => {
-        return state.splice(index + 1, 0, ...saved)
+        return state.toSpliced(index + 1, 0, ...saved)
       })
     }
 
diff --git a/packages/frontend-core/tsconfig.json b/packages/frontend-core/tsconfig.json
index 8ffb3f19be..d06da5a713 100644
--- a/packages/frontend-core/tsconfig.json
+++ b/packages/frontend-core/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "../../tsconfig.build.json",
   "compilerOptions": {
     "target": "ESNext",
+    "lib": ["ESNext"],
     "module": "preserve",
     "moduleResolution": "bundler",
     "outDir": "./dist",