fixed type error

Author: Andarist

packages/react/src/theming.tsx

@@ -5,7 +5,9 @@ import hoistNonReactStatics from './_isolated-hnrs'
 import { DistributiveOmit, PropsOf } from './types'
 
 // tslint:disable-next-line: no-empty-interface
-export interface Theme {}
+export interface Theme {
+  color: string
+}
 
 export interface ThemeProviderProps {
   theme: Partial<Theme> | ((outerTheme: Theme) => Theme)
@@ -58,7 +60,7 @@ const getTheme = (
 }
 
 let createCacheWithTheme = /* #__PURE__ */ weakMemoize((outerTheme: Theme) => {
-  return weakMemoize((theme: Theme) => {
+  return weakMemoize((theme: Partial<Theme> | ((theme: Theme) => Theme)) => {
     return getTheme(outerTheme, theme)
   })
 })