This folder contains code and types that are needed on both the frontend and the backend. It's important that you write this code in a particularly defensive way because it's limited by what both environments support:

For example, you cannot use the Deno keyword. For imports, you can't use npm: specifiers, so we recommend https://esm.sh because it works on the server & client. You can use TypeScript because that is transpiled in /backend/index.ts for the frontend. Most code that works on the frontend tends to work in Deno, because Deno is designed to support "web-standards", but there are definitely edge cases to look out for.

This folder contains:

• Grid interface: TypeScript type for grid objects
• GRID_SIZE and TOTAL_CELLS constants
• gridToText(): Converts grid state to textual representation
• createEmptyGrid(): Creates a new empty (all white) grid

These utilities are used by both the frontend React components and the backend API handlers.