exports corrects

engine/core/board.js

@@ -2,15 +2,6 @@ import Cell from './cell.js';
 import * as Movement from './movement/index.js';
 import Piece, { PieceColor, PieceType } from './piece.js';
 
-export default  {
-    Cell,
-    Movement,
-    Piece,
-    PieceColor,
-    PieceType,
-    Board
-};
-
 /**
  * Represents the game board.
  */
@@ -94,3 +85,12 @@ class Board {
         this.setPiece(4, 7, new Piece(PieceColor.BLACK, PieceType.KING, [Movement.KingMove]));
     }
 }
+
+export default  {
+    Cell,
+    Movement,
+    Piece,
+    PieceColor,
+    PieceType,
+    Board
+};

engine/core/card.js

@@ -10,3 +10,5 @@ class Card {
         this.effect;
     }
 }
+
+export default Card;

engine/core/cell.js

@@ -7,3 +7,5 @@ class Cell {
         this.piece = piece;
     }
 }
+
+export default Cell;

engine/core/effect.js

@@ -1,3 +1,5 @@
 class Effect {
     constructor() {}
 }
+
+export default Effect;

engine/core/game_state.js

@@ -60,3 +60,5 @@ class GameState {
         return team.hasKing();
     }
 }
+
+export default GameState;

engine/core/hand.js

@@ -27,3 +27,5 @@ class Hand {
         }
     }
 }
+
+export default Hand;

engine/core/piece.js

@@ -45,3 +45,5 @@ class Piece {
         return this.type;
     }
 }
+
+export default Piece;

engine/core/stack.js

@@ -46,3 +46,5 @@ class Stack {
         }
     }
 }
+
+export default Stack;

engine/core/team.js

@@ -25,3 +25,5 @@ class Team {
         return this.king !== null;
     }
 }
+
+export default Team;