The rule is written @forward "<url>". It loads the module at the given URL just like @use, but it makes the public members of the loaded module available to users of your module as though they were defined directly in your module. Those members aren’t available in your module, though—if you want that, you’ll need to write a @use rule as well.

In brief, @import is being replaced with more explicit @use and @forward rules. Over the next few years Sass @import will be deprecated, and then removed.