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             state-tests.ts
        
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      import { observe, stateful } from "./observable";

      import * as t from "tap";

      interface CounterState {

          count: number;

          label: "low" | "mid" | "high"

      }

      let set: (v: CounterState) => void = () => void (0);

      const initial: CounterState = { count: 0, label: "low" };

      let value = initial;

      const obs = observe(stateful<CounterState>(({ next }) => {

          next(initial);

          set = next;

      }));

      set({ count: 10, label: "mid" });

      obs.subscribe({

          next: v => value = v

      });

      t.equal(value.count, 10, "State should update");

      set({ count: 20, label: "high" });

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				import { observe, stateful } from "./observable";
				import * as t from "tap";

				interface CounterState {
				count: number;

				label: "low" \| "mid" \| "high"
				}

				let set: (v: CounterState) => void = () => void (0);
				const initial: CounterState = { count: 0, label: "low" };
				let value = initial;

				const obs = observe(stateful<CounterState>(({ next }) => {
				next(initial);
				set = next;
				}));

				set({ count: 10, label: "mid" });

				obs.subscribe({
				next: v => value = v
				});

				t.equal(value.count, 10, "State should update");

				set({ count: 20, label: "high" });