Accept File URLs in a VLQ Map

[binyamin]

Summary

When a VLQ Map's contains a File URL in the map's sources array, this module should preserve the "file://" URL scheme. Currently, it will strip the scheme and the leading slash, making it impossible for browsers to resolve correctly.

Relevance: By default, dart-sass generates file URLs. Which makes sense, because it's referring to files on the disk, not hosted files. This module mutilates the URL. Which means it will generate two sources for one file.

Before

{
    version: 3,
    sources: [
        "file:///home/binyamin/fake/style.scss"
    ],
    // ... rest of source-map
}

After

{
    version: 3,
    sources: [
        "home/binyamin/fake/style.scss"
    ],
    // ... rest of source-map
}