Laravel-mix: Unexpected double slash generated using webp in URL Processing

[MoogyG]

• Laravel Mix Version: 2.1.11
• Node Version (node -v): 9.9.0
• NPM Version (npm -v): 5.6.0
• OS: ubuntu ( using workspace container of laradock )

I am using url processing with jpeg and webp and since a while (between mix 2.0.0 and 2.1.11), it's not working anymore with webp.

here is my scss code :

.no-webp .custom-background {
    background-image: url('../img/custom.jpeg');
}

.webp .custom-background {
    background-image: url('../img/custom.webp');
}

css generated with laravel mix 2.1.11 :

.no-webp .custom-background {
    background-image: url(/images/custom.jpeg?47ab273…);
}

.webp .custom-background {
    background-image: url(//images/custom.webp?1cb1372…);
}

css generated with laravel mix 2.0.0 :

.no-webp .custom-background {
    background-image: url(/images/custom.jpeg?47ab273…);
}

.webp .custom-background {
    background-image: url(/images/custom.webp?1cb1372…);
}

[bayareawebpro]

I have the same issue when trying to generate a service worker with Google Workbox. All the entry points have double slashes except chunk files have the correct path.

[stale[bot]]

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[MoogyG]

Not reproduced in webpack "4.0.15", thanks.