This is a rough proof of concept for a simple implementation of includes without using mixins. The basic functionality works, but not recommended for production use yet.

Usage

This input:

.colors {
    background-color: white;
    color: black;
}

.padding {
    padding: 1rem 0;
}

main {
    @include .colors;
    @include .padding;
}

Will generate into:

.colors {
    background-color: white;
    color: black;
}

.padding {
    padding: 1rem 0;
}

main {
    background-color: white;
    color: black;
    padding: 1rem 0;
}

This syntax is supported too:

main {
    @include .colors, .padding;
} 

License

MIT.