specialmovements.js

module.exports = function specialMovement(options) {
  //...
      this.add({
        role: "movement",
        cmd: "rawMoves",
        isPawn: true
    }, (msg, reply) => {
        if (msg.piece.piece !== 'P') {
            return ("piece was not a pawn")
        }
        
        var pos = msg.piece.position;

        const rawMoves = pawnMoves(pos);
        reply(null, rawMoves);
    });

    this.add({
        role: "movement",
        cmd: "rawMoves",
        isKnight: true
    }, (msg, reply) => {
        if (msg.piece.piece !== 'N') {
            return ("piece was not a knight")
        }

        var rawMoves = [];
        var pos = msg.piece.position;

        rawMoves = knightMoves(pos);
        reply(null, rawMoves);
    });
}