theme: fix UnifiedThemeProvider type

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/theme/api-report.md

@@ -8,7 +8,6 @@ import { Overrides } from '@material-ui/core/styles/overrides';
 import { Palette } from '@material-ui/core/styles/createPalette';
 import { PaletteOptions } from '@material-ui/core/styles/createPalette';
 import { PaletteOptions as PaletteOptions_2 } from '@mui/material/styles/createPalette';
-import { default as React_2 } from 'react';
 import { ReactNode } from 'react';
 import { Theme } from '@mui/material/styles';
 import { Theme as Theme_2 } from '@material-ui/core';
@@ -411,7 +410,7 @@ export interface UnifiedThemeOptions {
 // @public
 export function UnifiedThemeProvider(
   props: UnifiedThemeProviderProps,
-): React_2.ReactNode;
+): JSX.Element;
 
 // @public
 export interface UnifiedThemeProviderProps {

packages/theme/src/unified/UnifiedThemeProvider.tsx

@@ -42,11 +42,13 @@ export interface UnifiedThemeProviderProps {
  *
  * @public
  */
-export function UnifiedThemeProvider(props: UnifiedThemeProviderProps) {
+export function UnifiedThemeProvider(
+  props: UnifiedThemeProviderProps,
+): JSX.Element {
   const { children, theme, noCssBaseline } = props;
 
   let result = noCssBaseline ? (
-    children
+    <>{children}</>
   ) : (
     <>
       <CssBaseline />