javascript Webpack 4 - 模块解析失败：意外字符“@”
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Webpack 4 - Module parse failed: Unexpected character '@'
提问by Edward
I recently upgraded from Webpack 3 to 4. It's now throwing an error:
我最近从 Webpack 3 升级到 4。它现在抛出一个错误：
Module parse failed: Unexpected character '@' You may need an appropriate loader to handle this file type. | @import './scss/variables.scss'; | | * { @ ./src/index.js 1:0-22
模块解析失败：意外字符“@” 您可能需要合适的加载程序来处理此文件类型。| @import './scss/variables.scss'; | | * { @ ./src/index.js 1:0-22
In my styles.scss file, I am doing the following:
在我的styles.scss 文件中，我正在执行以下操作：
@import 'scss/variables.scss';
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: Arial, Helvetica, sans-serif;
}
In my index.js file, I am only doing the following:
在我的 index.js 文件中，我只执行以下操作：
import './style.scss';
In my webpack.dev.js, all I changed was an addition of mode: 'development':
在我的 webpack.dev.js 中，我所做的只是增加了一个模式：'development'：
const StyleLintPlugin = require('stylelint-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const Dotenv = require('dotenv-webpack');
module.exports = {
mode: 'development',
entry: './src/index.js',
output: {
filename: 'public/bundle.js'
},
module: {
rules: [
{
test: /\.js$/,
exclude: /node_modules/,
loader: ['babel-loader', 'eslint-loader']
},
{
test: /\.scss$/,
loader: ExtractTextPlugin.extract(['css-loader', 'sass-loader'])
}
]
},
plugins: [
new StyleLintPlugin({
configFile: '.stylelintrc',
context: 'src',
files: '**/*.scss',
failOnError: false,
quiet: false,
syntax: 'scss'
}),
new ExtractTextPlugin('public/style.css'),
new Dotenv()
]
};
I don't know what change from Webpack 3 to 4 has caused this error.
不知道 Webpack 3 到 4 是什么变化导致了这个错误。
The issue I'm having is very similar to the issue posted here: Webpack 4 Module parse failed: Unexpected character '@' (1:0)
我遇到的问题与此处发布的问题非常相似：Webpack 4 Module parse failed: Unexpected character '@' (1:0)
I have been through all related stackoverflow questions and none of them helped.
我已经解决了所有相关的 stackoverflow 问题，但没有一个有帮助。
Here are the relevant dependencies in my package.json:
以下是我的 package.json 中的相关依赖项：
"babel-loader": "^7.1.4",
"css-loader": "^0.28.11",
"eslint-loader": "^1.9.0",
"extract-text-webpack-plugin": "^4.0.0-beta.0",
"node-sass": "^4.9.0",
"sass-loader": "^6.0.7",
"style-loader": "^0.20.3",
"stylelint-webpack-plugin": "^0.10.5",
"uglifyjs-webpack-plugin": "^1.2.5",
"webpack": "^4.8.3",
"webpack-cli": "^2.1.4"
Here are the relevant scripts in my package.json file, for reference in the comments:
以下是我的 package.json 文件中的相关脚本，供评论中参考：
"scripts": {
"watch": "./node_modules/.bin/webpack --mode development --watch --progress",
"build": "./node_modules/.bin/webpack --mode production"
},
采纳答案by Edward
The problem was the script I was using to run Webpack did not specify the config file. This is what it should look like:
问题是我用来运行 Webpack 的脚本没有指定配置文件。它应该是这样的：
"scripts": {
"watch": "./node_modules/.bin/webpack --watch --config webpack.dev.js",
},
I believe this was generating the @import problem because it was not loading the css-loader as without specifying the config file like above, it uses a default Webpack development config which does not include the css-loader.
我相信这会产生 @import 问题，因为它没有加载 css-loader，因为没有像上面那样指定配置文件，它使用了一个默认的 Webpack 开发配置，其中不包括 css-loader。
回答by Raul Rene
As I mentioned in a comment on your question there's an open issue with Webpack 4 compatibility: https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/701
正如我在对您的问题的评论中提到的，Webpack 4 兼容性存在一个未解决的问题：https: //github.com/webpack-contrib/extract-text-webpack-plugin/issues/701
A fix for now is to install the alpha version of the library. I've done a small setup just now to test this and it works with webpack 4.
现在的修复是安装库的 alpha 版本。我刚刚做了一个小设置来测试这个，它适用于 webpack 4。
Install the alpha version npm i -D extract-text-webpack-plugin@next --save. Then install css-loader, sass-loaderand node-sass.
安装 alpha 版本npm i -D extract-text-webpack-plugin@next --save。然后安装css-loader，sass-loader和node-sass。
Then in the webpack config file:
然后在 webpack 配置文件中：
const ExtractTextPlugin = require('extract-text-webpack-plugin');
...
module: {
rules: [
{
test: /\.(js|jsx)$/,
use: {
loader: 'babel-loader'
},
exclude: /node_modules/,
include: path.join(__dirname, 'src')
},
{
test: /\.scss$/,
loader: ExtractTextPlugin.extract(['css-loader', 'sass-loader'])
}
]
},
plugins: [
new ExtractTextPlugin('bundle.css'),
]
This correctly worked for me, and also concatenated multiple scss files that were using @importstatements.
这对我有用，并且还连接了多个使用@import语句的scss 文件。
In package.json it should look like
在 package.json 中它应该看起来像
"extract-text-webpack-plugin": "^4.0.0-beta.0",
"webpack": "^4.8.3"
Edit:Just as a side note, apparently mini-css-extract-pluginworks fine with webpack 4.
编辑：作为旁注，显然mini-css-extract-plugin与 webpack 4 配合良好。
