Using escaped selectors in Sass maps

Question

In our CSS we have escaped characters in our selectors using \ like so:

.width-1\.5 { width: 1.5rem; }
.width-1\/2 { width: 50%; }

So this allows us to have CSS classes like: class="width-1/2"

And we store all of these values in Sass maps like:

$widths: (1\.5: 1.5rem, 1\/2: 50%);

And then we create the CSS with a simple loop:

@each $key,
$value in $widths {
    .width-#{$key}: $value
}

However we get the error: SassError: 1\/2 isn't a valid CSS value.

So it's fine with \. but it doesn't like: \/. Even though outside of Sass it's fine to use this syntax to escape the /.

If we wrap the keys in quotes in the map like this: $widths: ('1\.5': 1.5rem, '1\/2': 50%);

Sass removes the escape character so it becomes just 1/2 and therefore an invalid CSS selector with: SassError: Invalid CSS after ".width-1": expected selector, was "/2".

How can we create this syntax using Sass maps?

Answer 1

The solution was to use the quote function:

$widths: (quote(1\/2): 50%);

Answer 2

I was able to make this work by double-escaping the punctuation. E.g.:

$widths: (
  '1\\.5': 1.5rem
)

For what it's worth, I'm using the sass NPM package. Not sure if there's a discrepancy between Dart Sass, node-sass, or other implementations that would affect whether this works or not.