如何使用webpack从node_modules加载静态CSS文件的示例？

Question

我不知道如何从node_modules库中加载leaflet/dist/leaflet.css，例如我安装了leaflet，但每次尝试加载CSS都会失败。

你能提供如何从node_modules加载静态样式的例子吗？

下面是我目前的webpack配置。此外，我正在使用extract-text-webpack-plugin和sass-loader我的项目scss文件工作良好，我也有css-loader，我有解析静态css文件或添加到stylePathResolves的东西

//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，注释掉了require('leaflet/dist/leaflet.css')给我的以下错误：

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，我已经做了一些步骤来让它工作，我不确定这种平衡的方式。

通过以下方式更改main app.js

• change webpack.config.js中的

1. npm install file-loader --save
2. add import 'leaflet/dist/leaflet.css';：

添加css-loader以摆脱SyntaxError: Unexpected token .，然后添加file-loader和匹配文件以摆脱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")]
};

在开始的时候，我从一些例子中得到了这个配置，它不是100%清楚为什么我使用ExtractTextPlugin来加载scs，以及与css-loader有什么关系，也许为了更连贯，我应该在这部分也使用ExtractTextPlugin，也许有人知道，可以审查代码吗？但我的解决方案是有效的，我可以进一步工作。

Answer 2

我不得不这样做：

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，我会得到：

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文件导入到您的 main.js 或main.js(或主JS文件的任何名称)中。否则，您会收到一条错误消息，指出 module.exports is read-only__.

import 'leaflet/dist/leaflet.css';

更新的webpack.config.js代码片段是：

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