Summary & Key Takeaways ​

• sourceNames now includes a locations kind, providing file:line:col for diagnostics.
• The plugin gains a root option to specify the base directory for source locations.
• createComponent and binding labels now carry source location information for better debugging.
• Server components have removed binding slots, with client components in slots replacing them for client-side behavior.
• SSR now evaluates ref expressions alongside spreads, ensuring hydration IDs align.

Our Commentary ​

Similar to the compiler, the SolidJS Babel plugin RC is getting better diagnostic reporting with source locations. This is just good engineering. The server component changes, specifically the removal of binding slots, are a consistent theme across these RCs. It's a clear direction for Solid 2.0's server story. The ref evaluation fix for SSR is also a subtle but important detail for hydration correctness.