Question

我不知道如何使用webpack从node_modules libs加载任何CSS，例如我安装了传单，每次加载leaflet/dist/leaflet.css的尝试都失败。

您能举例说明如何从node_modules加载静态样式吗？

我目前的webpack配置如下。另外，我正在使用extract-text-webpack-plugin和sass-loader我的项目scss文件运行良好，我还css-loader，让我解析静态css文件或向stylePathResolves添加内容？

//require('leaflet/dist/leaflet.css');

var ExtractTextPlugin = require("extract-text-webpack-plugin");
var webpack = require("webpack");
var path = require('path');

var stylePathResolves = (
  'includePaths[]=' + path.resolve('./') + '&' +
  'includePaths[]=' + path.resolve('./node_modules')
)

module.exports = {
  entry: ".js/app.js",
  output: {
    path: "./static/js",
    filename: "app.js"
  },
  module: {
    loaders: [{
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel'
      }, {
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract(
          'style',
          'css' + '!sass?outputStyle=expanded&' + stylePathResolves
        )
      }
    ]
  },
  plugins: [new ExtractTextPlugin("app.css")]
};

在哪里加载leaflet.css，注释掉require('leaflet/dist/leaflet.css')会出现以下错误：

home/myproj/node_modules/leaflet/dist/leaflet.css:3
.leaflet-map-pane,
^

SyntaxError: Unexpected token .

Answer 1

对于遇到类似问题的用户，我已经采取了一些步骤来实现它，我不确定这种均衡方式。

npm install file-loader --save
在主app.js

import 'leaflet/dist/leaflet.css';

按照以下方式更改webpack.config.js：

添加css-loader以摆脱SyntaxError: Unexpected token .，然后添加file-loader并匹配文件以摆脱Uncaught Error: Cannot find module "./images/layers.png"：

module.exports = {
  entry: "./web/static/js/app.js",
  output: {
    path: "./priv/static/js",
    filename: "app.js"
  },
  module: {
    loaders: [{
      test: /\.jsx?$/,
      exclude: /node_modules/,
      loader: 'babel'
    }, {
      test: /\.scss$/,
      loader: ExtractTextPlugin.extract(
        'style',
        'css' + '!sass?outputStyle=expanded&' + stylePathResolves
      )
    }, {
      test: /\.css$/,
      loader: "style-loader!css-loader"
    }, {
      test: /\.(png|jpg|jpeg|gif|svg|woff|woff2|ttf|eot)$/,
      loader: 'file-loader'
    }]
  },
  plugins: [new ExtractTextPlugin("app.css")]
};

一开始我从一些例子中得到了这个配置并且它不是100％清楚为什么我使用ExtractTextPlugin来加载scss以及与css-loader的相关性，也许是如果我在这部分也使用ExtractTextPlugin，可能会有人知道并且可以进行代码审查吗？但我的解决方案正在发挥作用，我可以继续努力。

Answer 2

我必须做：

npm install --save-dev style-loader css-loader file-loader

如果我没有为图像配置文件加载器，则会得到：

ERROR in ./node_modules/leaflet/dist/images/layers-2x.png 1:0
Module parse failed: Unexpected character '�' (1:0)
You may need an appropriate loader to handle this file type.
(Source code omitted for this binary file)
 @ ./node_modules/leaflet/dist/leaflet.css (./node_modules/css-loader!./node_modules/leaflet/dist/leaflet.css) 7:8888-8921
 @ ./node_modules/leaflet/dist/leaflet.css
 @ ./src/view/component/RouteMap.js
 @ ./src/index.js

ERROR in ./node_modules/leaflet/dist/images/layers.png 1:0
Module parse failed: Unexpected character '�' (1:0)
You may need an appropriate loader to handle this file type.
(Source code omitted for this binary file)
 @ ./node_modules/leaflet/dist/leaflet.css (./node_modules/css-loader!./node_modules/leaflet/dist/leaflet.css) 7:8716-8746
 @ ./node_modules/leaflet/dist/leaflet.css
 @ ./src/view/component/RouteMap.js
 @ ./src/index.js

ERROR in ./node_modules/leaflet/dist/images/marker-icon.png 1:0
Module parse failed: Unexpected character '�' (1:0)
You may need an appropriate loader to handle this file type.
(Source code omitted for this binary file)
 @ ./node_modules/leaflet/dist/leaflet.css (./node_modules/css-loader!./node_modules/leaflet/dist/leaflet.css) 7:9975-10010
 @ ./node_modules/leaflet/dist/leaflet.css
 @ ./src/view/component/RouteMap.js
 @ ./src/index.js

您还必须将CSS文件导入到index.js或main.js（或任何称为主JS的文件）中。否则，您会收到一条错误消息，说module.exports is read-only。

import 'leaflet/dist/leaflet.css';

更新后的webpack.config.js代码段是：

{
    ...
    module: {
        rules: [
            { test: /\.css$/, use: ["style-loader","css-loader"] },
            { test: /\.(png|svg|jpe?g|gif|woff2?|ttf|eot)$/, use: [ 'file-loader' ] },
        ],
    },

如何使用webpack从node_modules加载静态CSS文件？

2 个答案: