Webpack 4模块解析失败:意外的字符' @' (1:0)

时间:2018-05-22 22:14:12

标签: webpack

当我尝试运行npm run dev将我的scss编译为css时出现此错误。我知道该问题与@import

有关

./src/scss/main.scss中的错误 模块解析失败:意外的字符' @' (1:0) 您可能需要适当的加载程序来处理此文件类型。 | @import" header&#34 ;;  @ ./src/index.js 3:0-27

的src / index.js import "./scss/main.scss";

的src / SCSS / main.sccs

@import "header";

webpack.config.js

`
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const WebpackMd5Hash = require('webpack-md5-hash');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
    entry: { main: './src/index.js' },
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: '[name].[chunkhash].js'
    },
    module: {
        rules: [{
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: "babel-loader"
                }
            },
            {
                test: /\.scss$/,
                include: [
                    path.resolve(__dirname, 'src', 'sass')
                ],
                use: ['style-loader', MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader']
            }
        ]
    },
    plugins: [
        new CleanWebpackPlugin('dist', {}),
        new MiniCssExtractPlugin({
            filename: 'style.[contenthash].css',
        }),


  new HtmlWebpackPlugin({
        inject: false,
        hash: true,
        template: './src/index.html',
        filename: 'index.html'
    }),
    new WebpackMd5Hash()
  ]
  };`

的package.json

{
    "name": "post",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
        "build": "webpack --mode production",
        "dev": "webpack --mode development"
    },
    "author": "",
    "license": "ISC",
    "devDependencies": {
        "autoprefixer": "^8.2.0",
        "babel-core": "^6.26.0",
        "babel-loader": "^7.1.4",
        "babel-preset-env": "^1.6.1",
        "clean-webpack-plugin": "^0.1.19",
        "css-loader": "^0.28.11",
        "html-webpack-plugin": "^3.2.0",
        "mini-css-extract-plugin": "^0.4.0",
        "node-sass": "^4.8.3",
        "postcss-loader": "^2.1.3",
        "sass-loader": "^6.0.7",
        "style-loader": "^0.20.3",
        "webpack": "^4.4.1",
        "webpack-cli": "^2.0.13",
        "webpack-md5-hash": "0.0.6"
    }
}

4 个答案:

答案 0 :(得分:1)

问题在您的module.rule内部,用于处理项目中与SASS相关的文件。在您的规则内,您仅包含<path>/src/sass/目录中的SASS文件,即可编译为CSS:

{
   test: /\.scss$/,
   include: [
      path.resolve(__dirname, 'src', 'sass')
   ],
   use: ['style-loader', MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader']
}

但是,对目录结构的快速扫描显示,您的index.js文件实际上是从main.scss目录中导入src/scss/文件的:

index.js

import "./scss/main.scss";

这是一个问题,因为您的SASS规则仅打算从src/sass目录中将与SASS相关的文件编译为CSS ,但是与您的SASS相关的文件实际上位于您的{{ 1}}目录。

因此,您的SASS文件永远不会真正正确地编译为CSS。

要解决此问题,请一起删除src/scss部分,或将包含位置更改为SASS文件的正确路径位置:

include

我想考虑做的另一件事是将include: [ path.resolve(__dirname, 'src', 'scss') ],扩展名添加到.scss文件中的导入文件中:

main.scss

或在@import "header.scss";文件中添加一个resolve部分,以便您可以简化导入并让webpack适当地处理它们。类似于:

webpack.config.js

希望有帮助!

答案 1 :(得分:0)

我通过遵循these link解决了这些类似的问题。

我更新了rule的{​​{1}}部分,如下所示

webpack.config.js

然后按如下所示安装依赖项。

使用纱线

rules: [
    {
            test: /\.css$/,
            use : [
                {
                        loader: 'style-loader',
                },
                {
                        loader: 'css-loader',
                        options: {
                                sourceMap: true,
                        }
                }
            ]
    }
]

使用npm

yarn add style-loader --dev
yarn add css-loader --dev

答案 2 :(得分:0)

要为Webpack 4解决此问题,请先通过sass-loader安装node-sassstyle-loadercss-loadernpm

npm install sass-loader node-sass style-loader css-loader --save-dev

然后将此规则添加到webpack.config.js

module.exports = {
  module: {
    rules: [
      // ...Other rules,
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          'style-loader',
          // Translates CSS into CommonJS
          'css-loader',
          // Compiles Sass to CSS
          'sass-loader',
        ],
      },
    ],
  },
};

注意:顺序很重要,例如:不要将css-loader放在style-loader之前,否则您可能会得到怪异的错误提示!

答案 3 :(得分:-2)

我认为您的问题可能与我在此处发布的问题完全相同:Webpack 4 - Module parse failed: Unexpected character '@'

在你的脚本中,你和我一样,错过了--config webpack.dev.js

"build": "webpack --mode production",
"dev": "webpack --mode development"

它应该是这样的:

"build": "webpack --config webpack.dev.js",
"dev": ".webpack --config webpack.prod.js",

在你的Webpack配置文件中,你应该说出那样的模式:

module.exports = {
    mode: development,
    entry: { main: './src/index.js' },