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CSS URL Rewriting

One key concept to understand is that Mix and webpack will rewrite any url()s within your stylesheets. While this might initially sound strange, it's incredibly powerful.

An Example

Imagine that you want to compile a bit of Sass that includes a url to an image.

.example {
    background: url('../images/thing.png');
}

Notice how that the URL is a relative path? By default, Laravel Mix and webpack will locate thing.png, copy it to your dist/images folder, and then rewrite the url() to point to the new output location within your generated stylesheet. As such, your compiled CSS will ultimately be:

.example {
    background: url(/images/thing.png?d41d8cd98f00b204e9800998ecf8427e);
}

{tip} Absolute paths for url()s will always be excluded from url-rewriting. For instance, url('/images/thing.png') or url('http://example.com/images/thing.png') won't be touched.

This, again, is a very cool feature of webpack's. However, it does have a tendency to confuse those who don't understand how webpack and its css-loader plugin works. It's possible that your folder structure is already just how you want it, and you'd prefer that Mix not modify those url()s. If that's the case, we do offer an override:

mix.sass('src/app.scss', 'dist').options({
    processCssUrls: false
});

With this addition to your webpack.mix.js file, Mix will no longer match url()s or copy assets to your public directory. Instead, your compiled CSS will remain exactly as you typed it:

.example {
    background: url('../images/thing.png');
}

As a bonus, when you disable url processing, your Webpack Sass compilation will be much faster.

Per-file rewrite settings

Url rewriting can be controlled on a per-file basis by specifying the processUrls option. This option will take precedence over what has been specified via the processCssUrls mix option.

mix.options({
    // Don't perform any css url rewriting by default
    processCssUrls: false,
})

mix.sass('src/app.scss', 'dist', {
    // Rewrite CSS urls for app.scss
    processUrls: true,
});

mix.sass('src/admin.scss', 'dist');
mix.sass('src/other.scss', 'dist');