反应Webpack的“意外令牌"命名箭头功能 [英] React Webpack "unexpected token" named arrow function

问题描述

我已经使用webpack-middleware设置了反应全栈环境.我的代码中有一些es6语法，但是在没有构造函数或命名箭头功能的状态下出现错误.例如，我想使用语义UI来进行反应排序表: https://react.semantic-ui.com/collections/table# table-example-sortable 并且在编译时出现此错误: 在此处输入图片描述

I have set up react fullstack environment with webpack-middleware. I have some es6 syntax in my code but I get error while state without constructor or named arrow function. For example, I want to use semantic-ui for react sort table: https://react.semantic-ui.com/collections/table#table-example-sortable And while compiling I get this error: enter image description here

我以为是因为我在下面附加了错误的Webpack设置.

I thought it is because of wrong webpack setup I attached it below.

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: './client/index.js',
  output: {
    path: '/',
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        use: 'babel-loader',
        test: /\.js$/,
        exclude: /node_modules/
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'client/index.html'
    })
  ]
};

.babelrc

{
  "presets": ["env", "react", "es2015"]
}

推荐答案

您正在尝试使用类属性，这些属性目前是类别字段投标.要立即使用它们，您必须安装 babel-plugin-transform-class-properties .

You're trying to use class properties, which are currently stage 3 as part of the Class fields proposal. To be able to use them today, you have to install babel-plugin-transform-class-properties.

npm install --save-dev babel-plugin-transform-class-properties

并将其添加到.babelrc中的插件中.

And add it to your plugins in .babelrc.

{
  "presets": ["env", "react"],
  "plugins": ["transform-class-properties"]
}

我还删除了es2015预设，因为它已弃用了babel-preset-env，而其中包含了es2015所做的所有事情.

I also removed the es2015 preset since it has been deprecated in favour of babel-preset-env, which contains everything es2015 does and more.

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