无法使用Webpack解析CSS中背景图片的绝对url()路径 [英] Unable to resolve absolute url() paths for background images in CSS with Webpack

问题描述

我有以下Webpack配置(大致上，本文已简化):

I have the following Webpack config (roughly, it has been simplified for this post):

const rootPublic = path.resolve('./public');
const LOCAL_IDENT_NAME = 'localIdentName=[name]_[local]_[hash:base64:5]';
const CSS_LOADER = `css?sourceMap&${LOCAL_IDENT_NAME}&root=${rootPublic}`;
const SASS_LOADER = 'sass?sourceMap&includePaths[]=' + path.resolve(__dirname, './src/styles');

// ... loaders:

loaders: [
  {
    test: /\.(jpe?g|png|gif|svg)$/,
    loader: 'url-loader?limit=10000&name=[path][name].[ext]'
  },
  {
    test: /\.scss$/,
    loader: config.DEVELOPMENT_MODE ? `style!${CSS_LOADER}!autoprefixer!${SASS_LOADER}`
                : ExtractTextPlugin.extract('style', `${CSS_LOADER}!autoprefixer!${SASS_LOADER}`)
  }, // ...
]

现在，这对于在scss文件中正常引用的图像来说效果很好:

Now this works perfectly fine for images referenced normally in scss files:

.some-static-class {
  background: url('/images/bg.png');
}

但是，使用:local指令时，不起作用:

However, it does not work when using the :local directive:

:local .SomeClass {
  background: url('/images/bg.png');
}

我认为这是因为root是为CSS加载程序定义的.我收到一个构建错误:Module not found: Error: Cannot resolve 'file' or 'directory' ./../../../../../../../../images/bg.gif

And I think that's because root is defined for the CSS loader. I get a build error: Module not found: Error: Cannot resolve 'file' or 'directory' ./../../../../../../../../images/bg.gif

如果相反，我从css-loader配置中删除了root，则它可以正常运行，但是在Chrome的检查器中路径看起来"正确，但是当您实际在新标签页中打开链接时，它指向:chrome-devtools://devtools/bundled/"/images/bg.png"显然无法正确解决.

If instead I remove root from the css-loader config, then it builds fine but then the path "looks" correct in Chrome's inspector, but when you actually open the link in a new tab, it points to: chrome-devtools://devtools/bundled/"/images/bg.png" which obviously doesn't resolve correctly.

我不确定问题是否出在url-loader配置上，或者到底是怎么回事.

I'm not sure if the problem is with the url-loader config, or what's going on exactly.

我尝试了不同的Webpack配置，以指定resolve.root，resolve.modulesDirectories等，但完全不确定它们是否有任何影响，或者我是否会完全错误.我还遇到了resolve-url-loader，但不确定这是否就是我所需要的.

I played around with different webpack configs to specify the resolve.root, resolve.modulesDirectories, etc but totally not sure if they're having any affect or if I'm just going about it completely wrong. I also came across resolve-url-loader but not sure if that's even what I need at all.

有什么想法吗? MTIA！

Any ideas? MTIA!

更新

我应该注意，它在Safari中可以正常工作，但在Chrome中不能正常工作.因此，这似乎是一个特定于Chrome的错误，但是必须在Safari中进行所有开发都是不切实际的.

I should note, that it works fine in Safari, but not in Chrome. So it seems like a Chrome-specific bug, but it's not practical to have to do all our development in Safari.

我也遇到过 vue-style-loader ，它是声称可以解决此问题的样式加载器，但其解决方法是依靠不推荐使用的hacky不推荐使用的转义/转义方法.

I also came across, vue-style-loader, which is a fork of style-loader that claims to fix this issue, but the way it fixes it is by relying on a hacky deprecated escape/unescape method.

推荐答案

我可以提出的一种可能的解决方案是:

One possible solution that I could come up with was the following:

使用resolve-url-loader(紧随sass-loader之后):

style!${CSS_LOADER}!autoprefixer!resolve-url!${SASS_LOADER}

然后，为静态图像定义resolve.alias:

Then, define a resolve.alias for static images:

resolve: {
  alias: {
    images: path.join(__dirname, 'public/images')
  }
}

然后在CSS中，您可以像这样指向图像:

And then in the CSS, you can point to the images like so:

:local .SomeClass {
  background: url('images/bg.png');
}

根据您的URL结构，您可能还需要调整url-loader名称参数:

Depending on your URL structure, you may also need to tweak the url-loader name param:

{
  test: /\.(jpe?g|png|gif|svg)$/,
  loader: 'url-loader?limit=10000&name=images/[name].[ext]'
}

---

所以我不知道是否有更干净的方法来解决此问题，但这是迄今为止我能想到的最好的方法.我欢迎任何反馈或替代方案.

---

So I don't know if there's a cleaner way to solve this issue, but that's the best I could come up with so far. I'd welcome any feedback or alternatives.

谢谢！

更新2016年6月30日

有一些PR可以解决此问题，但是维护者更喜欢将解决方案放在CSS AST中，而不是在CSS加载器中...

There's a couple PR's out that would address this issue, but the maintainer prefers the solution to be in the CSS AST rather than in the CSS loader...

https://github.com/webpack/style-loader/pull/124 https://github.com/webpack/style-loader/pull/96

这里希望真正的解决办法能尽快发生...

Here's hoping a real fix happens soon...

这篇关于无法使用Webpack解析CSS中背景图片的绝对url()路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！