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The `satisfies` operator validates a type at compile time without widening it. Unlike `: Type`, it preserves the narrowed literal type while still enforcing the constraint. Use it when you want type safety without losing inference.

Instead of stashing or committing WIP to switch branches, use `git worktree add ../feature-branch feature-branch`. Each worktree gets its own working directory while sharing the same .git history. Clean up with `git worktree remove`.

Multi-stage builds let you use one stage for building (with all dev dependencies) and copy only the production artifacts to the final image. Went from a 1.2GB Node image to 180MB by separating the build and runtime stages.

Container queries (`@container`) let components respond to their parent's size instead of the viewport. Finally shipped in all major browsers. Perfect for reusable card components that need to adapt to sidebar vs. main content layouts.