rune/templates/javascript-react/src/logic.js

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function findWinningCombo(cells) {
  return (
    [
      [0, 1, 2],
      [3, 4, 5],
      [6, 7, 8],
      [0, 3, 6],
      [1, 4, 7],
      [2, 5, 8],
      [0, 4, 8],
      [2, 4, 6],
    ].find((combo) =>
      combo.every((i) => cells[i] && cells[i] === cells[combo[0]])
    ) || null
  )
}

Rune.initLogic({
  minPlayers: 2,
  maxPlayers: 2,
  setup: (allPlayerIds) => ({
    cells: new Array(9).fill(null),
    winCombo: null,
    lastMovePlayerId: null,
    playerIds: allPlayerIds,
  }),
  actions: {
    claimCell: (cellIndex, { game, playerId, allPlayerIds }) => {
      if (
        game.cells[cellIndex] !== null ||
        playerId === game.lastMovePlayerId
      ) {
        throw Rune.invalidAction()
      }

      game.cells[cellIndex] = playerId
      game.lastMovePlayerId = playerId
      game.winCombo = findWinningCombo(game.cells)

      if (game.winCombo) {
        const [player1, player2] = allPlayerIds

        Rune.gameOver({
          players: {
            [player1]: game.lastMovePlayerId === player1 ? "WON" : "LOST",
            [player2]: game.lastMovePlayerId === player2 ? "WON" : "LOST",
          },
        })
      }

      game.freeCells = game.cells.findIndex((cell) => cell === null) !== -1

      if (!game.freeCells) {
        Rune.gameOver({
          players: {
            [game.playerIds[0]]: "LOST",
            [game.playerIds[1]]: "LOST",
          },
        })
      }
    },
  },
})