Javascript 模块生成失败:语法错误:使用webpack2时缺少类属性转换
我正在为我的项目使用React,我正在从webpack2迁移到webpack3。更新babel和所有依赖项后,我执行了Javascript 模块生成失败:语法错误:使用webpack2时缺少类属性转换,javascript,reactjs,webpack,ecmascript-6,webpack-3,Javascript,Reactjs,Webpack,Ecmascript 6,Webpack 3,我正在为我的项目使用React,我正在从webpack2迁移到webpack3。更新babel和所有依赖项后,我执行了npm run build,导致错误:模块构建失败:语法错误:缺少类属性转换。 错误示例: 11 | 12 | class Login extends Component { > 13 | state = { | ^ 14 | email: "", 15 | password: "" 16 |
npm run build
,导致错误:模块构建失败:语法错误:缺少类属性转换。
错误示例:
11 |
12 | class Login extends Component {
> 13 | state = {
| ^
14 | email: "",
15 | password: ""
16 | }
另一个例子:
11 | class Navigation extends React.Component {
12 |
> 13 | state = {
| ^
14 | loadingTotal: false,
15 | }
有人知道问题出在哪里吗?我试着用谷歌搜索错误,但到目前为止我还没有找到任何解决方案
B.法律改革委员会
{
"presets": ["env", "stage-2", "react"],
"plugins": [
"react-hot-loader/babel",
"transform-class-properties"
]
}
webpack.config
const webpack = require('webpack');
const WriteFilePlugin = require('write-file-webpack-plugin');
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
const path = require('path');
const config = {
entry: {
'vendor': './dist/vendor',
'app': [
'react-hot-loader/patch',
'./app/index'
]
},
output: {
path: process.env.WEBPACK_ENV === 'production' ? path.join(__dirname, '/../../../../public_html/') : path.join(__dirname, '/public'),
filename: '[name].js',
publicPath: '/'
},
resolve: {
extensions: ['.ts', '.js', '.json']
},
module: {
rules: [
// { enforce: 'pre', test: /\.js$/, exclude: /node_modules/, loader: 'eslint-loader' }
{
test: /\.(js|jsx)?$/,
exclude: /node_modules/,
options: {
presets: ['env']
},
loader: 'babel-loader'
},
{test: /\.json$/, loader: 'json-loader'},
{test: /\.html/, loader: 'html-loader'},
{test: /\.styl$/, loader: 'style-loader!css-loader!stylus-loader'},
{test: /\.css$/, loader: 'style-loader!css-loader'},
{test: /\.(gif|png|jpe?g)$/i, loader: 'file-loader?name=images/[name].[ext]'},
{
test: /\.woff2?$/,
loader: 'url-loader?name=fonts/[name].[ext]&limit=10000&mimetype=application/font-woff'
},
{test: /\.(ttf|eot|svg)$/, loader: 'file-loader?name=fonts/[name].[ext]'}
]
}
};
console.log(process.env.WEBPACK_ENV);
config.devtool = process.env.WEBPACK_ENV === 'production' ? 'source-map' : 'eval-source-map';
config.plugins = [
new webpack.ProvidePlugin({
'$': "jquery",
'jQuery': "jquery",
'window.jQuery': "jquery",
'window.$': 'jquery'
}),
new webpack.DefinePlugin({
'WEBPACK_ENV': process.env.WEBPACK_ENV === 'production' ? '"production"' : '"dev"'
}),
new ExtractTextPlugin("styles.css"),
process.env.WEBPACK_ENV === 'production' ? new UglifyJSPlugin() : WriteFilePlugin()
]
module.exports = config;
生成命令:
"NODE_ENV=production BABEL_ENV=production WEBPACK_ENV=production ./node_modules/.bin/webpack --config webpack.config.js",
你忘了吗
顺便说一下,如果您使用的是.babelrc
,则不需要在webpack中配置babel加载程序选项因此,您可以删除以下内容:
options: {
presets: ['env']
},
谢谢你关于.babelrc的补充意见。webpack.config.js中的babel配置似乎优先于.babelrc。
options: {
presets: ['env']
},