diff --git a/src/webpack/common/menu.ts b/src/webpack/common/menu.ts
index 91a40bd50..4c231d241 100644
--- a/src/webpack/common/menu.ts
+++ b/src/webpack/common/menu.ts
@@ -25,5 +25,5 @@ export const Menu = findByProps<t.Menu>("MenuItem", "MenuSliderControl");
 export const ContextMenuApi: t.ContextMenuApi = mapMangledModule('type:"CONTEXT_MENU_OPEN', {
     closeContextMenu: filters.byCode("CONTEXT_MENU_CLOSE"),
     openContextMenu: filters.byCode("renderLazy:"),
-    openContextMenuLazy: e => typeof e === "function" && e.toString().length < 100
+    openContextMenuLazy: e => typeof e === "function" && String(e).length < 100
 });
diff --git a/src/webpack/common/utils.ts b/src/webpack/common/utils.ts
index 250361c12..918c460bc 100644
--- a/src/webpack/common/utils.ts
+++ b/src/webpack/common/utils.ts
@@ -154,7 +154,7 @@ const openExpressionPickerMatcher = canonicalizeMatch(/setState\({activeView:\i,
 // TODO: type
 export const ExpressionPickerStore: t.ExpressionPickerStore = mapMangledModule("expression-picker-last-active-view", {
     closeExpressionPicker: filters.byCode("setState({activeView:null"),
-    openExpressionPicker: m => typeof m === "function" && openExpressionPickerMatcher.test(m.toString()),
+    openExpressionPicker: m => typeof m === "function" && openExpressionPickerMatcher.test(String(m)),
 });
 
 export const PopoutActions: t.PopoutActions = mapMangledModule('type:"POPOUT_WINDOW_OPEN"', {