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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  // IGNORING
  // - logged IN / OUT
  
const syncCommunitiesMachine = Machine({
  id: "syncCommunitiesMachine",
  initial: "lastFailed", // this right?
  context: {
    local: {
      home: 0,
      communities: []
    },
    lastSyncDate: new Date() // use real date
  },
  states: {
    lastFailed: {
      on: {
        ADD_COMMUNITY: "merging",
        APP_OPENED: "merging"
      }
    },
    lastSuccess: {
      on: {
        ADD_COMMUNITY: "pushing",
        APP_OPENED: "pulling"
      }
    },
    merging: {
      invoke: {
        id: "merge",
        src: async (context, event) => {
          console.log("get upstream"); // on fail, fire event('FAIL')
          console.log("reconcile upstream and local");
          console.log("set upstream"); // on fail, fire event('FAIL')
          return new Promise(resolve => setTimeout(() => resolve(), 1000));
        },
        onDone: {
          target: "lastSuccess"
        },
        onError: {
          target: "lastFailed"
        }
      }
    },
    pushing: {
      on: {
        SUCCEED: "lastSuccess",
        FAIL: "lastFailed"
      }
    },
    pulling: {
      on: {
        SUCCEED: "lastSuccess",
        FAIL: "lastFailed"
      }
    }
  }
})