React:无法设置属性'lastEffect‘为null

Question

在生产中，我的错误越来越少。看上去好像是跟丑化Webpack插件有关，我找不到解决办法。

Webpack配置：

    const UglifyJSPlugin = require("uglifyjs-webpack-plugin");

 module.exports = {
   mode: "production",
   entry: "./index.tsx",
  resolve: {
      extensions: [".js", ".tsx"]
   },
   module: {
     rules: [
      {
        test: /\.tsx?$/,
        use: {
          loader: "ts-loader",
           options: {
        transpileOnly: true
          }
         }
       }
     ]
  },
   optimization: {
       minimizer: [new UglifyJSPlugin()]
  }
};

index.tsx

    import * as React from 'react';
    import * as ReactDOM from 'react-dom';

    const TestComponent = () => {
        React.useEffect(() => {});
        return null;
    };

    ReactDOM.render(<TestComponent />, document.getElementById('app'));

版本：

"react": "^16.7.0-alpha.0",
"react-dom": "^16.7.0-alpha.0",
"uglifyjs-webpack-plugin": "^2.0.1",
"webpack": "4.19.0",
"webpack-cli": "^3.1.2"

错误：

  React: Cannot set property 'lastEffect' of null

Answer 1

这是由uglifyjs-webpack插件版本2.0.1在反应16.7.0-alpha，因为它打破了新的钩子特性的反应。

您可以尝试使用terser插件。下面是链接：https://github.com/webpack-contrib/terser-webpack-plugin

Answer 2

如果您更新到uglifyjs-webpack插件版本2.2.0，那么问题就解决了。