Use namespace import instead of default import for React

Author: Harry Cruse

src/components/Icons.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import * as React from 'react';
 
 import { Theme, TypeOptions } from '../types';
 import { Default } from '../utils';

src/utils/cssTransition.tsx

@@ -1,4 +1,5 @@
-import React, { useEffect, useLayoutEffect, useRef } from 'react';
+import * as React from 'react';
+import { useEffect, useLayoutEffect, useRef } from 'react';
 import { ToastTransitionProps } from '../types';
 
 import { collapseToast } from './collapseToast';