Javascript babel-loader jsx 语法错误：意外的令牌
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babel-loader jsx SyntaxError: Unexpected token
提问by Keyu Lin
I'm a beginner in React + Webpack.
我是 React + Webpack 的初学者。
I found a weird error in my hello world web app.
我在 hello world 网络应用程序中发现了一个奇怪的错误。
I'm using babel-loader in webpack to help me convert jsx into js, but it seems like babel can't understand jsx syntax.
我在webpack中使用babel-loader来帮我把jsx转成js，但是babel好像看不懂jsx的语法。
Here are my dependencies:
这是我的依赖项：
"devDependencies": {
"babel-core": "^6.0.14",
"babel-loader": "^6.0.0",
"webpack": "^1.12.2",
"webpack-dev-server": "^1.12.1"
},
"dependencies": {
"react": "^0.14.1"
}
Here is my webpack.config.js
这是我的 webpack.config.js
var path = require('path');
module.exports = {
entry: ['webpack/hot/dev-server',path.resolve(__dirname, 'app/main.js')],
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js'
},
module: {
loaders: [
{ test: /\.js$/, exclude: /node_modules/, loader: "babel-loader"}
]
}
};
Here is my app/main.js
这是我的 app/main.js
var React = require("react");
React.render(<h1>hello world</h1>,document.getElementById("app"));
And this is the error message
这是错误信息
ERROR in ./app/main.js
Module build failed: SyntaxError: ~/**/app/main.js: Unexpected token (2:13)
1 | var React = require("react");
> 2 | React.render(<h1>hello world</h1>,document.getElementById("app"));
| ^
at Parser.pp.raise (~/**/node_modules/babylon/lib/parser/location.js:24:13)
Thanks for you guys.
谢谢你们。
回答by Yoon
Add "babel-preset-react"
添加“babel-preset-react”
npm install babel-preset-react
and add "presets" option to babel-loader in your webpack.config.js
并在 webpack.config.js 中为 babel-loader 添加“预设”选项
(or you can add it to your .babelrc or package.js: http://babeljs.io/docs/usage/babelrc/)
（或者你可以将它添加到你的 .babelrc 或 package.js: http://babeljs.io/docs/usage/babelrc/）
Here is an example webpack.config.js:
这是一个示例 webpack.config.js：
{
test: /\.jsx?$/, // Match both .js and .jsx files
exclude: /node_modules/,
loader: "babel",
query:
{
presets:['react']
}
}
Recently Babel 6 was released and there was a major change: https://babeljs.io/blog/2015/10/29/6.0.0
最近 Babel 6 发布了，有一个比较大的变化：https: //babeljs.io/blog/2015/10/29/6.0.0
If you are using react 0.14, you should use ReactDOM.render()(from require('react-dom')) instead of React.render(): https://facebook.github.io/react/blog/#changelog
如果您使用的是 react 0.14，则应使用ReactDOM.render()(from require('react-dom')) 而不是React.render()：https: //facebook.github.io/react/blog/#changelog
UPDATE 2018
2018 年更新
Rule.query has already been deprecated in favour of Rule.options. Usage in webpack 4 is as follows:
Rule.query 已经被弃用，取而代之的是 Rule.options。webpack 4 中的用法如下：
npm install babel-loader babel-preset-react
Then in your webpack configuration (as an entry in the module.rules array in the module.exports object)
然后在你的 webpack 配置中（作为 module.exports 对象中 module.rules 数组中的一个条目）
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['react']
}
}
],
}
回答by svnm
I ran into a similar issue when migrating from babel 5 to babel 6.
从 babel 5 迁移到 babel 6 时，我遇到了类似的问题。
I was just running babel to compile the srcto libfolder babel src --out-dir lib
我只是运行 babel 来编译src到lib文件夹babel src --out-dir lib
I will share my setup for babel 6:
我将分享我的 babel 6 设置：
Ensure you have the following babel 6 devDependenciesinstalled
确保您有以下巴贝尔6个devDependencies安装
"babel-core": "^6.7.6",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.6.0",
"babel-preset-react": "^6.5.0",
"babel-preset-stage-0": "^6.5.0"
Add your .babelrcfile to the project:
将您的.babelrc文件添加到项目中：
{
"presets": ["es2015", "stage-0", "react"]
}
回答by Everett
Since the answer above still leaves some peoplein the dark, here's what a complete webpack.config.js might look like:
由于上面的答案仍然让一些人一头雾水，因此完整的 webpack.config.js 可能如下所示：
var path = require('path');
var config = {
entry: path.resolve(__dirname, 'app/main.js'),
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js'
},
module: {
loaders: [{
test: /\.jsx?$/,
loader: 'babel',
query:
{
presets:['es2015', 'react']
}
}]
},
};
module.exports = config;回答by albanx
For me the solution was to create the file .babelrcwith this content:
对我来说，解决方案是.babelrc使用以下内容创建文件：
{
"presets": ["react", "es2015", "stage-1"]
}
回答by Vladyslav Babenko
The following way has helped me (includes react-hot, babel loaders and es2015, react presets):
以下方法对我有所帮助（包括 react-hot、babel 加载器和 es2015、react 预设）：
loaders: [
{
test: /\.jsx?$/,
exclude: /node_modules/,
loaders: ['react-hot', 'babel?presets[]=es2015&presets[]=react']
}
]
回答by Aftab Naveed
For those who still might be facing issue adding jsx to test fixed it for me
对于那些仍然可能遇到问题的人，添加 jsx 来测试为我修复了它
test: /\.jsx?$/,
回答by jose920405
This works perfect for me
这对我来说很完美
{
test: /\.(js|jsx)$/,
loader: 'babel-loader',
exclude: /node_modules/,
query: {
presets: ['es2015','react']
}
},
回答by Maxime Brehin
You can find a really good boilerplate made by Henrik Joreteg (ampersandjs) here: https://github.com/HenrikJoreteg/hjs-webpack
你可以在这里找到一个由 Henrik Joreteg (ampersandjs) 制作的非常好的样板：https: //github.com/HenrikJoreteg/hjs-webpack
Then in your webpack.config.js
然后在你的 webpack.config.js
var getConfig = require('hjs-webpack')
module.exports = getConfig({
in: 'src/index.js',
out: 'public',
clearBeforeBuild: true,
https: process.argv.indexOf('--https') !== -1
})
