Create a tool to migrate users to @use

The new module system is on the horizon, and we want to make it as easy as possible for users to migrate to it. Probably the biggest value-add for this migration would be creating a tool that takes a Sass entrypoint and converts it and everything it imports to @use. This would include:

• Replacing top-level @imports with @uses.
• Adding new @uses for variables, functions, and mixins that are referred to without explicit imports (including core library functions).
• Adding namespaces to variable, function, and mixin uses.
• Replacing overridden variables with with blocks.
• Replacing nested @imports with @include load-css().
• Adding namespaces to get-function() calls whose referent can be statically determined, and printing warnings for others.

In order to do this, the migration tool would probably need to partially evaluate the Sass files in order to determine where each variable, mixin, and function was originally defined. It could then use source span information to modify code in-place without disrupting the rest of the stylesheet.

[jathak]

~ prefixed URLs (as well as URLs resolved relative to load paths) are already excluded from --migrate-deps, so I think this is a bug where we’re trying to rename a member in a file that we’d never migrate. You’re not using --remove-prefix, so I’m guessing this has something to do with pseudoprivate members. Can you open an issue in the migrator repo?

[nex3]

I think we can safely close this one out.