@ibrahim-rahhal/resolve-url-loader
v5.0.0
Published
Webpack loader that resolves relative paths in url() statements based on the original source file
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Resolve URL Loader
This webpack loader allows you to have a distributed set SCSS files and assets co-located with those SCSS files.
Do you organise your SCSS and assets by feature?
Where are your assets?
- ✅ I want my assets all over the place, next to my SCSS files.
- ❌ My assets are in a single directory.
How complicated is your SASS?
- ✅ I have a deep SASS composition with partials importing other partials.
- ✅ My asset paths are constructed by functions or
@mixin
s. - ❌ I have a single SCSS file. The asset paths are just explicit in that.
What asset paths are you using?
- ✅ Fully relative
url(./foo.png)
orurl(foo.png)
- ❌ Root relative
url(/foo.png)
- ❌ Relative to some package or webpack root
url(~stuff/foo.png
) - ❌ Relative to some variable which is your single asset directory
url($variable/foo.png)
What webpack errors are you getting?
- ✅ Webpack can't find the relative asset
foo.png
😞 - ❌ Webpack says it doesn't have a loader for
fully/resolved/path/foo.png
😕
If you can tick at least 1 item in all of these questions then use this loader. It will allow webpack to find assets with fully relative paths.
If for any question you can't tick any items then webpack should be able to already find your assets. You don't need this loader. 🤷
Once webpack resolves your assets (even if it complains about loading them) then this loading is working correctly. 👍
What's the problem with SASS?
When you use fully relative paths in url()
statements then Webpack expects to find those assets next to the root SCSS file, regardless of where you specify the url()
.
To illustrate here are 3 simple examples of SASS and Webpack without resolve-url-loader
.
The first 2 cases are trivial and work fine. The asset is specified in the root SCSS file and Webpack finds it.
But any practical SASS composition will have nested SCSS files, as in the 3rd case. Here Webpack cannot find the asset.
Module not found: Can't resolve './cool.png' in '/absolute/path/.../my-project/src/styles.scss'
The path we present to Webpack really needs to be ./subdir/cool.png
but we don't want to write that in our SCSS. 😒
Luckily we can use resolve-url-loader
to do the url re-writing and make it work. 😊🎉
With functions and mixins and multiple nesting it gets more complicated. Read more detail in how the loader works. 🤓
Getting started
Upgrading? the changelog shows how to migrate your webpack config.
Install
via npm
npm install resolve-url-loader --save-dev
via yarn
yarn add resolve-url-loader --dev
Configure Webpack
The typical use case is resolve-url-loader
between sass-loader
and css-loader
.
⚠️ IMPORTANT
- source-maps required for loaders preceding
resolve-url-loader
(regardless ofdevtool
). - Always use full loader package name (don't omit
-loader
) otherwise you can get errors that are hard to debug.
rules: [
{
test: /\.scss$/,
use: [
...
{
loader: 'css-loader',
options: {...}
}, {
loader: 'resolve-url-loader',
options: {...}
}, {
loader: 'sass-loader',
options: {
sourceMap: true, // <-- !!IMPORTANT!!
}
}
]
},
...
]
Options
The loader should work without options but use these as required.
| option | type | default | | description |
|-------------|----------|-----------------------------------------|----------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| sourceMap
| boolean | false
| | Generate an outgoing source-map. |
| removeCR
| boolean | true
Windows OSfalse
otherwise | | Convert orphan CR to whitespace.See known issues below. |
| debug
| boolean | false
| | Display debug information. |
| silent
| boolean | false
| | Do not display warnings or deprecation messages. |
| root
| string | unset | | Similar to the (now defunct) option in css-loader
.This string, possibly empty, is prepended to absolute URIs.Absolute URIs are only processed if this option is set. |
| join
| function | inbuilt | advanced | Custom join function.Use custom javascript to fix asset paths on a per-case basis.Refer to the advanced features docs. |
Limitations
Compatibility
Tested macOS
and Windows
.
All webpack@4
-webpack@5
with contemporaneous loaders/plugins using node@12
.
Refer to test
directory for full webpack configurations as used in automated tests.
Known issues
Read the troubleshooting docs before raising an issue.