babel-loader jsx 语法错误:意外的令牌 [英] babel-loader jsx SyntaxError: Unexpected token
问题描述
我是 React + Webpack 的初学者.
I'm a beginner in React + Webpack.
我在 hello world 网络应用中发现了一个奇怪的错误.
I found a weird error in my hello world web app.
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语法.
I'm using babel-loader in webpack to help me convert jsx into js, but it seems like babel can't understand jsx syntax.
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"
}
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$/, exclude: /node_modules/, loader: "babel-loader"}
]
}
};
这是我的app/main.js
var React = require("react");
React.render(<h1>hello world</h1>,document.getElementById("app"));
这是错误信息
ERROR in ./app/main.js
Module build failed: SyntaxError: ~/**/app/main.js: Unexpected token (2:13)
1 | var React = require("react");
> 2 | React.render(<h1>hello world</h1>,document.getElementById("app"));
| ^
at Parser.pp.raise (~/**/node_modules/babylon/lib/parser/location.js:24:13)
谢谢你们.
推荐答案
添加babel-preset-react"
Add "babel-preset-react"
npm install babel-preset-react
并在 webpack.config.js 中为 babel-loader 添加预设"选项
and add "presets" option to babel-loader in your webpack.config.js
(或者您可以将其添加到您的 .babelrc 或 package.js:http://babeljs.io/docs/usage/babelrc/)
(or you can add it to your .babelrc or package.js: http://babeljs.io/docs/usage/babelrc/)
这是一个 webpack.config.js 示例:
Here is an example webpack.config.js:
{
test: /.jsx?$/, // Match both .js and .jsx files
exclude: /node_modules/,
loader: "babel",
query:
{
presets:['react']
}
}
最近 Babel 6 发布了,有一个重大的变化:https://babeljs.io/blog/2015/10/29/6.0.0
Recently Babel 6 was released and there was a major change: https://babeljs.io/blog/2015/10/29/6.0.0
如果你使用 react 0.14,你应该使用 ReactDOM.render()
(来自 require('react-dom')
)而不是 React.render()
: https://facebook.github.io/react/blog/#changelog
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
2018 年更新
Rule.query 已被弃用,取而代之的是 Rule.options.webpack 4 中的用法如下:
Rule.query has already been deprecated in favour of Rule.options. Usage in webpack 4 is as follows:
npm install babel-loader babel-preset-react
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)
Then in your webpack configuration (as an entry in the module.rules array in the module.exports object)
{
test: /.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['react']
}
}
],
}
这篇关于babel-loader jsx 语法错误:意外的令牌的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!