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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const controlsStates = {
  id: 'controlsStates',
  initial: 'paused',
  states: {
    paused: {
      on: {
        press_play: 'playing',
        keydown: {
          target: 'playing',
          cond: 'isSpacebar'
        }
      }
    },
    playing: {
      on: {
        press_pause: 'paused',
        keydown: {
          target: 'paused',
          cond: 'isSpacebar'
        }
      }
    },
  }
}

const uiMachine = Machine({
  id: "ui",
  type: "parallel",
  states: {
    controlsVisibility: {
      id: "controlsVisibility",
      initial: "hidden",
      states: {
        visible: {
          after: {
            3000: "hidden"
          }
        },
        hidden: {
          on: {
            mousemove: "visible"
          }
        }
      }
    },
    controls: controlsStates
  }
},
  {
    guards: {
      isSpacebar: (ctx, event) => event.code === "Space"
    }
  })