Question

我看到发布的几个问题看起来很像这样，但到目前为止还没有一个解决方案有所帮助。我试图加快React的速度。我试过按照我在网上找到的每个教程，包括一些非常简单，直截了当的教程。无论我尝试什么，我都会收到意外的令牌错误。

index.js：

import React from "react";
import ReactDOM from "react-dom";

const title = 'My React page';

ReactDOM.render(
  <div>{title}</div>,
  document.getElementById('app')
)

的package.json：

{
  "name": "swvreact",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "webpack --mode development --display-error-details",
    "build": "webpack --mode production",
    "start": "webpack-dev-server --mode development --open"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "babel-core": "^6.26.0",
    "babel-loader": "^7.1.4",
    "babel-preset-env": "^1.6.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "react-prop-types": "^0.4.0",
    "webpack": "^4.3.0",
    "webpack-cli": "^2.0.13",
    "webpack-dev-server": "^3.1.1"
  }
}

webpack.config.js：

const webpack = require('webpack');

module.exports = {
  devtool: 'inline-source-map',
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        use: ['babel-loader']
      },
      {
        test: /\.js?$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      }
    ]
  },
};

.babelrc：

{
    "presets": [
        "env", 
        "react", 
        "es2015", 
        "stage-2"
    ]
}

错误：

ERROR in ./src/index.js
Module build failed: SyntaxError: D:/work/swvreact/swvreact/src/index.js: 
Unexpected token (7:4)

   5 |
   6 | ReactDOM.render(
>  7 |     <div>{title}</div>,
     |     ^
   8 |     document.getElementById('app')
   9 | )
  10 |

BabelLoaderError: SyntaxError: D:/work/swvreact/swvreact/src/index.js: 
Unexpected token (7:4)

   5 |
   6 | ReactDOM.render(
>  7 |     <div>{title}</div>,
     |     ^
   8 |     document.getElementById('app')
   9 | )
  10 |

    at transpile (D:\work\swvreact\swvreact\node_modules\babel- 
   loader\lib\index.js:65:13)

我尝试过移动文件，玩配置，玩.js和.jsx文件类型，我能想到的一切。发布的代码来自我能找到的最简单的教程，似乎是最新的。

我的设置是运行Windows 10，Visual Studio Code，Chrome和Firefox以及Windows命令提示符的PC。所有申请都是最新的。我确定我错过了一些小东西，但我确定无法找到它。

Answer 1

如果webpack找不到您的.babelrc，则会出现此错误。确保文件名中没有拼写错误您也可以尝试将babel配置放入package.json，如下所示：

"babel": {
  "presets": [
    "env",
    "react",
    "stage-2"
  ]
},

或者在webpack.config.js中添加如下选项：

test: /\.jsx?$/,
use: {
    loader: 'babel-loader',
    options: {
        presets: [
            'env',
            'react',
            'es2015',
            'stage-2',
        ]
    }
}

Webpack编译React时出现意外的令牌错误

1 个答案: