在特定的 webpack 构建(角度 2)的情况下，如何将 CSS 文件中的资产 url() 替换为第 3 方域? [英] How to replace assets url()s in CSS files to a 3rd party domain in case of specific webpack build (angular 2)?

问题描述

我想通过以下方式在我的 CSS 中使用 url()s:

I want to use the url()s in my CSS in the following way:

.someImage {
    background: url(/assets/img/some-image.png);
}

如果我使用的是开发版本 (config/webpack.dev.js)，我希望它被翻译成 background: url(/assets/img/some-image.png);(因为它默认工作).

In case I'm using development build (config/webpack.dev.js), I want it to to be translated to background: url(/assets/img/some-image.png); (as it works by default).

但是，如果我使用的是生产版本 (config/webpack.prod.js)，我希望它被翻译成 background: url(http://some-3rd-party-domain.com/assets/img/some-image.png);

However In case I'm using production build (config/webpack.prod.js), I want it to be translated to background: url(http://some-3rd-party-domain.com/assets/img/some-image.png);

考虑一下 http://some-3rd-party-domain.com，因为它是一个与为 Angular 应用程序提供服务的域完全不同的域.

Think about the http://some-3rd-party-domain.com as it is a completely different domain than the one that servers the angular app.

另一个重要的事情是我不想替换我的 css 文件中的所有路径.这意味着我只想在 url() 匹配特定路径时替换它们(在此示例中:/assets/*).

Another important thing is that I don't want to replace all the paths in my css files. Which means that I want to replace url()s only if they match a specific path (in this example: /assets/*).

如果没有深度黑客攻击，这可能吗?如果是，如何?

您可以在这里找到我当前配置的一些详细信息:

Here you can find some details from my current config:

config/webpack.common.js的相关部分:

// ...
{
    test: /.css$/,
    loader: extractVendorCSS.extract({ 
        fallbackLoader: 'style-loader', loader: 'css-loader' }),
    include: [/node_modules/]
},
{
    test: /.css$/,
    use: ['to-string-loader', 'css-loader'],
    exclude: [/node_modules/]
},
{
    test: /.(jpg|png|gif)$/,
    use: 'file-loader'
},
{
    test: /.(png|woff|woff2|eot|ttf|svg)(?v=[0-9].[0-9].[0-9])?$/,
    loader: 'url'
}
// ...

config/webpack.dev.js 和 config/webpack.prod.js 都以下列方式包含环境特定的 URL 信息:

Both config/webpack.dev.js and config/webpack.prod.js contains the environment specific URL info in the following way:

config/webpack.dev.js:

// ...
const ENV = process.env.ENV = process.env.NODE_ENV = 'development';
const API_URL = process.env.API_URL = 'http://localhost:3000/assets/mock-data/';
const ASSETS_URL = process.env.API_URL = 'http://localhost:3000/assets/';
const HOST = process.env.HOST || 'localhost';
const PORT = process.env.PORT || 3000;
const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
    host: HOST,
    API_URL: API_URL,
    ASSETS_URL: ASSETS_URL,
    port: PORT,
    ENV: ENV,
});
// ...

config/webpack.prod.js:

// ...
const ENV = process.env.ENV = process.env.NODE_ENV = 'development';
const API_URL = process.env.API_URL = 'http://some-api-url/rest/';
const ASSETS_URL = process.env.ASSETS_URL = 'http://some-3rd-party-domain.com/assets/';
const HOST = process.env.HOST || 'localhost';
const PORT = process.env.PORT || 8080;
const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
    host: HOST,
    API_URL: API_URL,
    ASSETS_URL: ASSETS_URL,
    port: PORT,
    ENV: ENV,
});
// ...

谢谢！

推荐答案

我想，你应该查看关于 publicPath 的文档:http://webpack.github.io/docs/configuration.html#output-公共路径

I think, you should check the documentation about publicPath: http://webpack.github.io/docs/configuration.html#output-publicpath

output: {
    path: "/home/proj/public/assets",
    publicPath: ENV === "development"? "/assets/" : "http://some-3rd-party-domain.com/assets/"
}

但是有一个重要的时刻:
您对图像使用绝对路径 (background: url(/assets/img/some-image.png);) 并且 css-loader 不会对您的 url 执行任何操作

您应该切换到另一种语法:background: url(~img/some-image.png);
https://github.com/webpack-contrib/css-loader 中的更多信息

But there is one important moment:
you use an absolute path for images (background: url(/assets/img/some-image.png);) and css-loader will do nothing with your urls

You should switch to another syntax: background: url(~img/some-image.png);
more information in https://github.com/webpack-contrib/css-loader

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