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There is zero JavaScript to play this game of Tic-Tac-Toe, only TypeScript type definitions. You'll notice everything in src is written as .d.ts files to prove this to you.

There are also tests to validate the functionality of the games' components.

How to Play #

The game is set up and ready to play in ./game-demo.ts. The board that's set up is structed like so:

type Board = [
  ["1", "2", "3"],
  ["4", "5", "6"],
  ["7", "8", "9"],
];

To play a move, you use the Prompt type:

type TurnOne = Prompt<Board, "7">;

This will play X where the "7" previously was, and the "AI" will automatically play "O":

type Board = [
  ["O", "2", "3"],
  ["4", "5", "6"],
  ["X", "8", "9"],
];

When a few moves are played:

type Board = [
  ["O", "O", "3"],
  ["4", "5", "6"],
  ["X", "X", "9"],
];

Prompt<Board, "9">

It will output: "Player wins!" or "Computer wins!" depending on who last played.

Notes #

• The AI will only ever play the first available move on the board, making it trivial to cheat
  • The only file that needs to be changed here is ai.ts, everything else should support this
• In the future, the final played board would be nice to see the win/loss against
• Win conditions are currently represented as strings in win-conditions.ts.
  • It might be nice to define the size of a board, and would require this logic to change