2018-12-07 admin


什么是resolve-url-loader,Webpack loader that resolves relative paths in url() statements based on the original source file


Resolve URL Loader

A webpack loader that rewrites relative paths in url() statements based on the original source file.


TL;DR Making Sass work with a feature based project structure

With webpack you can import a .scss file (or some other compile-to-css file) and have a loader take care of the transpilation. With Sass (at least) this file can include a whole tree of source files into a single output.

We can imagine a virtual .css file at the location the original .scss import. Webpack expects any assets found in this CSS to be relative to the original imported file.

For projects with a feature based structure this will be a problem, since you will want to co-locate your assets with your .scss partials.

Example - webpack imports index.scss which includes feature foo.

files content
src /
index.scss @import features/foo
features /
_foo.scss url(bar.png)

Intuatively we want the assets in partial _foo.scss relative to the partial, meaning url(bar.png).

However webpack’s css-loader will encounter url(bar.png) and expect to find src/bar.png. This is not the correct location and the build will fail.

Thankfully resolve-url-loader provides the “url rewriting” that Sass is missing. Use it after the transpiler (such as sass-loader). It makes use of the source-map to find the original source file and rewrite url() statements.

In our example it rewrites url(bar.png) to url(features/bar.png) as required.

Getting started

See resolve-url-loader package.

Other stuff

See test-my-cli package for a functional programming framework for cli-testing. An unpublished work in progress.

See resolve-url-loader-filesearch package for the now defunct file search “magic” from resolve-url-loader@<3.0.0. This is currently unpublished. It needs to be adapted as a join function to be useful to anyone.


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