webpack css-loader背景图像错误加载

时间:2016-07-17 18:20:39

标签: angular webpack babeljs css-loader babel-register

我正在开发一个Angular2 + ES2015 + Babel + Webpack项目,当我在CSS文件中包含图像并使用css-loader时,我遇到了这个问题,到目前为止,它已经有几个小时没有找到问题了但是没有运气:

ERROR in ./src/app/home/home.component.css
Module build failed: SyntaxError: /path/to/project/src/app/home/images/penguin.png: Unexpected character '�' (1:0)
> 1 | �PNG
    | ^
  2 | 
  3 | 
  4 | IHDR��>a�gAMA��7��!�IDATx��]xTEמ�B�"�)"��� ��T?@?�iRiD�tPA��)"���$��K���K���wτ���f��M6a���OHؽ3s�3gΜ93#���>���x��}����>���x�Ƅ&���f&�o>
                                                ��ɉI�O����#S�a-a
                                                                  �9�8!�W1<�)O�G�j��B�
    at Parser.pp.raise (/path/to/project/node_modules/babylon/lib/parser/location.js:22:13)
    at Parser.getTokenFromCode (/path/to/project/node_modules/babylon/lib/tokenizer/index.js:561:12)
    at Parser.readToken (/path/to/project/node_modules/babylon/lib/tokenizer/index.js:180:21)
    at Parser.readToken (/path/to/project/node_modules/babylon/lib/plugins/flow.js:164:22)
    at Parser.nextToken (/path/to/project/node_modules/babylon/lib/tokenizer/index.js:169:21)
    at Parser.parse (/path/to/project/node_modules/babylon/lib/parser/index.js:128:12)
    at parse (/path/to/project/node_modules/babylon/lib/index.js:47:47)
    at File.parse (/path/to/project/node_modules/babel-core/lib/transformation/file/index.js:517:34)
    at File.parseCode (/path/to/project/node_modules/babel-core/lib/transformation/file/index.js:603:20)
    at /path/to/project/node_modules/babel-core/lib/transformation/pipeline.js:49:12
    at File.wrap (/path/to/project/node_modules/babel-core/lib/transformation/file/index.js:563:16)
    at Pipeline.transform (/path/to/project/node_modules/babel-core/lib/transformation/pipeline.js:47:17)
    at Object.transformFileSync (/path/to/project/node_modules/babel-core/lib/api/node.js:144:10)
    at compile (/path/to/project/node_modules/babel-register/lib/node.js:129:20)
    at loader (/path/to/project/node_modules/babel-register/lib/node.js:158:14)
    at Object.require.extensions.(anonymous function) [as .js] (/path/to/project/node_modules/babel-register/lib/node.js:168:7)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/path/to/project/src/app/home/home.component.css:6:2430)
    at Module._compile (module.js:409:26)
    at Object.loaderContext.exec (/path/to/project/node_modules/webpack-core/lib/NormalModuleMixin.js:88:7)
    at Object.module.exports (/path/to/project/node_modules/to-string-loader/src/to-string.js:6:54)

如果您搜索错误,您会在github问题和stackoverflow上找到类似的情况,但不完全相同。在所有这些中都指出了缺少图像加载器(png文件在这里),但在我的情况下,我有一个完美的工作。 如果直接在JS文件上require('../image/penguin.png'),它就会被加载并导出到输出路径!

我的进程和Webpack配置非常复杂,大而且分成不同的文件,但这是有趣的部分

import config from './config';

{
  [...]
  module: {
    preLoaders: [
      {
        test: /\.js$/,
        exclude: [/node_modules/],
        loader: 'eslint'
      },
      {
        test: /\.css$/,
        exclude: [/node_modules/],
        loader: 'postcss?pack=lint'
      }
    ],
    loaders: [
      {
        test: /\.js$/,
        exclude: [/node_modules/, /\.(spec|e2e)\.js$/],
        loaders: [
          'babel',
          'angular2-template'
        ]
      },
      {
        test: /\.css$/,
        exclude: [/node_modules/],
        loaders: [
          'to-string',
          'css?-import',
          'postcss?pack=process'
        ]
      },
      {
        test: /\.(png|jpe?g|gif)$/,
        loaders: [
          'url?limit=10000&name=assets/images/[name].[ext]?[hash:20]',
          'image-webpack?bypassOnDebug&optimizationLevel=6'
        ]
      },
      [...]
    ]
  },
  output: {
    path: resolve(config.paths.dist),
    publicPath: `http://${config.dev.host}:${config.dev.port}/`,
    filename: '[name].js',
    sourceMapFilename: '[name].map',
    chunkFilename: '[id].chunk.js'
  },
  [...]
}

这里是触发错误的css片段

[...]
.post-image {
  height: 150px;
  background-image: url(./images/penguin.png);
  background-position: center center;
  background-repeat: no-repeat;
}

如果将to-string-loader用于css看起来很奇怪,那是因为angular2-template-loader允许将CSS直接内联到Angular2 Componet的stylesUrl

由于错误堆栈,似乎一旦css-loader完成了这项工作,png文件没有加载定义的加载器(url!image-webpack),但它加载了babel-register?所以我console.log来自css-loader的结果,并且有预期的图像require

[...]
exports.push([module.id, ".post-image{height:150px;background-image:url(" + require("./images/penguin.png") + ");background-position:50%;background-repeat:no-repeat}", ""]);

所以我让babel忽略了png文件

{
  "presets": [
    "es2015",
    "angular2",
    "stage-3"
  ],
  "ignore": ["*.png"]
}

这引发了一个略有不同的错误,因为babel忽略了图像,但最终似乎是一样的:

ERROR in ./src/app/home/home.component.css
Module build failed: SyntaxError: Unexpected token ILLEGAL
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at loader (/path/to/project/node_modules/babel-register/lib/node.js:158:5)
    at Object.require.extensions.(anonymous function) [as .js] (/path/to/project/node_modules/babel-register/lib/node.js:168:7)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/path/to/project/src/app/home/home.component.css:6:2430)
    at Module._compile (module.js:409:26)
    at Object.loaderContext.exec (/path/to/project/node_modules/webpack-core/lib/NormalModuleMixin.js:88:7)
    at Object.module.exports (/path/to/project/node_modules/to-string-loader/src/to-string.js:6:54)

我没有任何线索,我要去WTF只是在CSS文件上设置图像背景应该很容易就像馅饼

有什么想法吗?

1 个答案:

答案 0 :(得分:4)

终于做到了。

问题的根源在链的末尾:to-string-loader

加载程序使用Loader.exec来处理css-loader的响应,但此代码知道issue

除了停止使用加载器之外,还可以在该问题中找到一些解决方案。但到目前为止,最好的是创建一个由Mathias Raacke(@ooc)提出的特殊加载器in this other issue

我希望这可以帮助别人不浪费这么多时间!