我有一个正在运行的 React 应用程序,我想使用 React.lazy 添加基于路由的代码拆分。
目前我的代码是,
import { PureComponent, cloneElement, Suspense, lazy } from 'react';
...
export const CartPage = lazy(() => import(/* webpackMode: "lazy", webpackPrefetch: true */ 'Route/CartPage'));
...
<Suspense fallback={ this.renderFallbackPage() }>
<NoMatchHandler>
<Switch>
...
<Route path="/cart" exact component={ CartPage } />
...
</Switch>
</NoMatchHandler>
</Suspense>
这里只提到了相关部分,以使其紧凑。
现在的问题是,在 webpack-dev-server 中,它运行得很好,但是当我运行 npm run build 时,转到
/cart
代码中断。关注后link mentioned for the error ,这是消息Element type is invalid. Received a promise that resolves to: function i(e){var r;return
r=t.call(this,e)||this,T()(y?!e.wrapperProps[d]:!e[d],"Passing redux store in props has
been removed and does not do anything.
"+P),r.selectDerivedProps=n(),r.selectChildElement=function(){var t,e,n,r;return
function(i,o,a){return(o!==t||a!==e||r!==i)&&(t=o,e=a,r=i,n=m.a.createElement(i,Object(O.a)
({},o,{ref:a}))),n}}
(),r.indirectRenderWrappedComponent=r.indirectRenderWrappedComponent.bind(function(t)
{if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been
called");return t}(r)),r}. Lazy element type must resolve to a class or function.
我已经做过的一些常见故障排除
CartPage
组件,我做了export default connect(mapStateToProps, mapDispatchToProps)(CartPage);
16.13.1
奇怪的是,
Received a promise that resolves to: function...
.这是一个函数!但随后它提示 Lazy element type must resolve to a class or function
.这对我来说没有任何意义。可能有什么问题?
编辑
Route/CartPage/index.js
有以下内容import { PureComponent } from 'react';
export default class CartPage extends PureComponent {
render() {
return <h1>Test</h1>;
}
}
我故意让它尽可能简单。但还是出现了同样的错误。但是参数不同。现在错误是 this
Element type is invalid. Received a promise that resolves to: function
t(){return c()(this,t),r.apply(this,arguments)}. Lazy element type
must resolve to a class or function.
编辑 2
我从
webpack.config.js
中删除了以下几行.它开始工作了!仍然不知道为什么const MinifyPlugin = require('babel-minify-webpack-plugin');
...
plugins: [
...,
new MinifyPlugin({
removeConsole: false,
removeDebugger: false
}, {
comments: false
})
]
...
最佳答案
就像我在问题中提到的,babel-minify-webpack-plugin
由于某种原因导致了这个问题。我的猜测是,他们将函数定义保存为字符串以节省空间,并在其逻辑中的某处使用 eval。但这只是我的猜测。
不管怎样,Github page for babel-minify-webpack-plugin说它已被弃用,所以我最终从我的项目中删除了它,并使用了 terser-webpack-plugin反而。现在似乎一切正常,构建时间也显着减少。我的建议是,避免使用 babel-minify-webpack-plugin
并使用其他一些缩小插件代替
关于reactjs - React.lazy 不在生产模式下工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62105539/