您可能需要适当的加载程序来处理此文件类型。eith react.js、webpack、babel

Question

我试图编译js文件与反应使用webpack与巴贝尔，但我得到以下错误消息：

./js/IntroAndWorkSpace.js模块解析失败时出错：C:\FULLTIME\STUDY Material\ReactJS\NewReactPoject\js\IntroAndWorkSpace.js意外标记（1:8）您可能需要适当的加载程序来处理此文件类型。SyntaxError:意外标记（1:8）

这是我的js文件

import* React from 'react'
import*  ReactDOM from 'react-dom',


ReactDOM.render(<h1>headingthe  of page</h1>,
	document.getElementById('head')
	);

{
  "name": "newreactproject",
  "version": "1.0.0",
  "description": "myreactproject for learning react",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "priya",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.14.0",
    "babel-loader": "^6.2.5",
    "babel-plugin-add-module-exports": "^0.2.1",
    "babel-plugin-react-html-attrs": "^2.0.0",
    "babel-plugin-transform-class-properties": "^6.11.5",
    "babel-plugin-transform-decorators-legacy": "^1.3.4",
    "babel-preset-es2015": "^6.14.0",
    "babel-preset-react": "^6.11.1",
    "babel-preset-stage-0": "^6.5.0",
    "react": "^15.3.1",
    "react-dom": "^15.3.1",
    "webpack": "^1.13.2"
  }
}

var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');

module.exports = {
  context: __dirname,
  devtool: debug ? "inline-sourcemap" : null,
  entry: "./js/scripts.js",
     loaders: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
        query: {
          presets: ['react', 'es2015', 'stage-0'],
          plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],
        }
      }
    ],
  output: {
    path: __dirname + "/js",
    filename: "scripts.min.js"
  },
  plugins: debug ? [] : [
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
  ],
};   

Answer 1

loaders: [
          {
            test: /\.js$/,
            exclude: /(node_modules|bower_components)/,
            loader: 'babel-loader',
            query: {
              presets: ['react', 'es2015', 'stage-0'],
              plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy'],
            }
          }
        ],

Answer 2

看起来你把一切都安排好了。我认为问题在于，您的网页包配置文件配置为使用react和ES2015预设，使用babel加载程序加载扩展名为.jsx的文件，但您尝试加载的文件（IntroAndWorkSpace.js）并没有以.jsx扩展名结尾。

由于与您的文件扩展名保持一致可能是一个好主意，因此有两个选项可以解决此问题：

1）将要加载的文件扩展名更改为. js，而不是. jsx。

2）将加载器测试更改为加载扩展名为. js的文件，而不是. jsx：

loaders: [
    {
        test: /\.js?$/,
        ...
    }
]