chore: fix bundle size #315
                
     Merged
            
            
          
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使用 async/await 会导致 webpack 4 打包 regeneratorRuntime 的时候多打包一份 cjs 模块,升级 webpack 5 可以解决,因为 babel 使用了 exports 来指定 import 路径。
这里没有必要使用 async/await,先删除了。