Webpack2不理解我的SASS文件中的@import语句（如何使用webpack2编译SASS？）

Question

Using Webpack 2 and sass-loader 4.11

webpack --config webpack.config.js

Here is my webpack.config.js

var path = require('path');
var sass = require("./sass/lifeleveler.scss");

module.exports = {
    entry: './dist/main.js',
    output: {
        filename: 'lifeleveler.app.js',
        path: path.resolve(__dirname, 'dist')
    },
    watch: true,
    watchOptions: {
        aggregateTimeout: 300,
        poll: 1000,
        ignored: /node_modules/
    },
    module: {
        loaders: [
            {
                test: /\.scss$/,
                include: [
                    path.resolve(__dirname, 'node_modules'),
                    path.resolve(__dirname, './sass')
                ],
                loaders: ["style-loader", "css-loader", "sass-loader"]
            }
        ],
        rules: [
            {
                test: /\.tsx?$/,
                loader: 'ts-loader',
                exclude: /node_modules/,
            },
            {
                enforce: 'pre',
                test: /\.tsx?$/,
                use: "source-map-loader"
            }
        ]
    },
    sassLoader: {
        includePaths: [path.resolve(__dirname, "./sass")]
    },
    resolve: {
        modulesDirectories: ['./sass'],
        extensions: [".tsx", ".ts", ".js", "scss"]
    },
    devtool: 'inline-source-map'
};

---

Note when I tried this at the top of my config:

var css = require("!raw-loader!sass-loader!./sass/lifeleveler.scss");
var css = require("!css-loader!sass-loader!./sass/lifeleveler.scss");

Got this error:

Error: Cannot find module '!raw-loader!sass-loader!./sass/lifeleveler.scss'

Which is why I went with just this: var sass = require("./sass/lifeleveler.scss");

---

And my lifeleveler.scss file ( from my SASS project starter kit ):

@import "vendors/normalize";    // Normalize stylesheet
@import "vendors/reset";        // Reset stylesheet
@import "modules/base";         // Load base files
@import "modules/defaults";     // Defaults elements
@import "modules/inputs";       // Inputs & Selects
@import "modules/buttons";      // Buttons
@import "modules/layout";       // Load Layouts
@import "modules/svg";          // Load SVG
@import "modules/queries";      // Media Queries

Any finally my folder structure, do you see any glaring issues?

I found this solution here , however I added my ./sass path to the modulesDirectories array and still getting the error.

After more digging I also found this Github issue and solution here , but his fix didn't work for me either :(

Answer 1

I reproduced your issue here and was able to fix it.

First of all, you need to change your webpack configuration file. Some points:

1. put yout scss loader inside rules option and separate each loader into an object (like this );
2. get rid of the line var sass = require("./sass/lifeleveler.scss"); at the top of the configuration. The file should be called from your entrypoint JS. In this case: dist/main.js . At this point (before reading the config), webpack is not configured to load any stuff. That's causing the error you showed.
3. get rid of sassLoader.includePaths and resolve.modulesDirectories , as they are not valid webpack 2 keys.

Webpack 2 configuration structure is a bit different from Webpack 1 (you can check a official migration guide here )..

The working webpack.config.js file would be something like this:

var path = require('path');


module.exports = {
    entry: './dist/main.js',
    output: {
        filename: 'lifeleveler.app.js',
        path: path.resolve(__dirname, 'dist')
    },
    watch: true,
    watchOptions: {
        aggregateTimeout: 300,
        poll: 1000,
        ignored: /node_modules/
    },
    module: {
        rules: [
            {
                test: /\.scss$/,
                include: [
                    path.resolve(__dirname, "sass")
                ],             
                use: [
                     { loader: "style-loader" },
                     { loader: "css-loader" },
                     { loader: "sass-loader" }
                ]
            },
            {
                test: /\.tsx?$/,
                loader: 'ts-loader',
                exclude: /node_modules/,
            },
            {
                enforce: 'pre',
                test: /\.tsx?$/,
                use: "source-map-loader"
            }
        ]
    },
    resolve: {
        extensions: [".tsx", ".ts", ".js", "scss"]
    },
    devtool: 'inline-source-map'
};

In your main.js , now you can require your scss file calling:

require('../sass/lifeleveler.scss'); //assuming main.js is at ./dist

Make sure you've npm installed style-loader , css-loader , node-sass and sass-loader .

Now compiles correctly!

Answer 2

Try this configuration to your webpack.config.js

...
module: {
  rules: [
    {
      test: /.s?css$/,
      use: ExtractTextWebpack.extract({
        fallback: 'style-loader',
        use: [
          {
            loader: 'css-loader',
            options: {
              sourceMap: true,
              importLoader: true
            }
          },
          {
            loader: 'postcss-loader',
            options: {
              plugins: [
                ... // fill your config
              ]
            }
          },
          {
            loader: 'sass-loader',
            options: {
              ... // fill your config
            }
          }
        ]
      })
    }
  ]
},
plugins: [
  new ExtractTextWebpack({
    filename: 'bundle.css'
  })
]
...

This is the version of dependencies you need.

"devDependencies": {
    "css-loader": "^0.26.1",
    "extract-text-webpack-plugin": "beta",
    "node-sass": "^4.5.0",
    "postcss-loader": "^1.2.2",
    "sass-loader": "^4.1.1",
    "style-loader": "^0.13.1",
    "webpack": "^2.2.1",
  }

don't forget to require your style.scss root to your entry file.

Example: in your ./dist/main.js require your sass by writing require('../sass/liveleverer.scss')