hex-world
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    Type Alias MoveCostFn

    MoveCostFn: (from: HexCoord, to: HexCoord) => number

    Cost function supplied by the game. Called for each candidate move. Return Infinity (or any non-finite value) to mark a cell as impassable. Costs must be non-negative.

    IMPORTANT: findPath's A* heuristic assumes every step costs at least 1. If your cost function can return values below 1 (e.g. cheap roads at 0.5), pass that minimum as minMoveCost in FindPathOptions — otherwise returned paths may not be optimal.

    Type Declaration

    const cost: MoveCostFn = (from, to) => {
      const terrain = map.getTerrain(col, row); // close over your HexMap
      if (terrain === TerrainType.Water) return Infinity;
      if (terrain === TerrainType.Rock)  return 3;
      return 1;
    };

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