diff --git a/packages/stylex/src/StyleXTypes.d.ts b/packages/stylex/src/StyleXTypes.d.ts
index b272b56c7..678571075 100644
--- a/packages/stylex/src/StyleXTypes.d.ts
+++ b/packages/stylex/src/StyleXTypes.d.ts
@@ -200,7 +200,7 @@ export type Theme<
 type OverridesForTokenType<Config extends { [key: string]: unknown }> = {
   [Key in keyof Config]:
     | Config[Key]
-    | { default: Config[Key]; [atRule: AtRuleStr]: Config[Key] };
+    | { default: Config[Key]; [atRule: string]: Config[Key] };
 };
 
 export type StyleX$CreateTheme = <
diff --git a/packages/stylex/src/StyleXTypes.js b/packages/stylex/src/StyleXTypes.js
index 218b96274..8ff30fce6 100644
--- a/packages/stylex/src/StyleXTypes.js
+++ b/packages/stylex/src/StyleXTypes.js
@@ -42,6 +42,7 @@ type CSSPropertiesWithExtras = $ReadOnly<{
   '::-webkit-search-cancel-button'?: CSSProperties,
   '::-webkit-search-results-button'?: CSSProperties,
   '::-webkit-search-results-decoration'?: CSSProperties,
+  
 }>;
 
 export type NestedCSSPropTypes = $ReadOnly<{
@@ -176,12 +177,13 @@ export type Theme<
   [string]: StyleXClassNameFor<string, IDFromVarGroup<T>>,
 }>;
 
-export type OverridesForTokenType<Config: { +[string]: mixed }> = {
+export type OverridesForTokenType<Config extends { [key: string]: unknown }> = {
   [Key in keyof Config]:
     | Config[Key]
-    | { +default: Config[Key], +[string]: Config[Key] },
+    | { default: Config[Key]; [property: string]: Config[Key] };
 };
 
+
 export type StyleX$CreateTheme = <
   BaseTokens: VarGroup<{ +[string]: mixed }>,
   ID: string = string,