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machine.js

const tichuMachine = Machine({
	id: "tichu",
	initial: "init",
	context: {
	  grandTichu: []
	},
	states: {
	  init: {
		on: {
		  DEAL_FIRST: "grandTichus",
		}
	},
	grandTichus: {
		on: {
			DEAL_REST: "trade",
							  DECLARE_GRAND_TICHU_0: {
								target: "grandTichus",
								cond: (context, event) => !context.grandTichu.includes("0"),
								actions: assign({
								  grandTichu: (context, event) => context.grandTichu.push("0")
								})
							  },
							  DECLARE_GRAND_TICHU_1: {
								target: "grandTichus",
								cond: (context, event) => !context.grandTichu.includes("1"),
								actions: assign({
								  grandTichu: (context, event) => context.grandTichu.push("1")
								})
							  }
		}
	  },
	  trade: {
		type: "final"
	  }
	}
  });