♟️ chess-ts-lib

chess-ts-lib is a TypeScript-based library that provides a complete object-oriented architecture to manage a chess game, including players, board state, piece logic, movements, turns, castling, promotion, check and checkmate validations, and more.

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📦 Installation

npm

npm install chess-ts-lib

pnpm

pnpm add chess-ts-lib

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🧠 Features

• Full object-oriented architecture in TypeScript
• Individual classes for each chess piece
• Move validation and listing of available moves
• Turn manager
• Castling support
• Pawn promotion
• Check and checkmate validation
• Player and game management
• Board state tracking and cloning
• Helper functions to support logic

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🧱 Structure

• Piece (abstract class): Base class for all pieces. Each piece implements its own movement logic.
• ChessBoard: Main class that handles piece movement, turn changes, checkmate detection, and game logic.
• Game: High-level class for starting the game and managing players.
• BoardMovements, BoardStateManager, TurnManager: Utility classes for managing movements, board state, and player turns.
• CastlingManager: Manages castling permissions and execution.
• BoardValidations: Static validation methods.
• PieceFactory, PieceDirections: Utilities for piece instantiation and direction control.

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✅ Example Usage

import { Game, Player, PieceColor } from "chess-ts-lib";

const game = new Game(console.log);

game.start();

game.manager.addPlayer(new Player("Alice"));
game.manager.addPlayer(new Player("Bob"));

if (game.arePlayersReady) {
  game.move([6, 4], [4, 4]); // Example: white pawn e2 to e4
}

Advanced Example: Custom Board Setup

import { Game, createFreshBoard, PieceFactory } from "chess-ts-lib";

const customBoard = createFreshBoard();
customBoard[0][0] = PieceFactory.create("rook", "black");
customBoard[7][7] = PieceFactory.create("rook", "white");

const game = new Game(console.log);
game.start(customBoard);

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🧪 Testing & Debugging

Use the notifier function to receive logs or game notifications.

const game = new Game((msg) => console.log("Event:", msg));

You can validate board state, simulate castling or checkmate, and create custom boards using:

import { createFreshBoard, cloneBoard } from "chess-ts-lib";

Run unit tests to ensure functionality:

pnpm test

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🎯 Utilities

• isInBounds: Validates if a position is within board limits.
• isCellEmpty, isCellCaptured, isCellBlocked: Helpers to check cell state.
• logMovement: Logs a movement.
• cloneBoard: Returns a deep copy of the board.
• PieceFactory: Instantiates specific pieces.

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📊 Architecture Diagram

Below is a simplified UML diagram of the library's architecture:

+-------------------+
|      Game         |
+-------------------+
         |
         v
+-------------------+
|    ChessBoard     |
+-------------------+
         |
         v
+-------------------+
|      Piece        |
+-------------------+
         |
  +------+-------+
  |      |       |
  v      v       v
Pawn   Rook    Bishop

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🧩 Extendability

The code is modular and open for extension. You can:

• Add new game modes
• Implement timers or scoring
• Integrate with UIs or online multiplayer systems

Adding a New Piece

To add a new piece, extend the Piece class and implement its movement logic:

import { Piece } from "chess-ts-lib";

class CustomPiece extends Piece {
  getAvailableMoves() {
    // Custom movement logic
  }
}

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❓ FAQ

How do I handle special moves like en passant?

Special moves are handled automatically by the library if the board state is valid.

Can I integrate this library with a frontend?

Yes, the library is designed to be UI-agnostic and can be integrated with any frontend framework.

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📜 License

MIT License

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🙌 Contributions

Pull requests and ideas are welcome! Please ensure your code follows the existing style and includes tests.