Generated by XState Viz: https://xstate.js.org/viz

machine.js

function maxErrors(context, event) {
  return context.errorCount > 2;
}

function versionMismatch(context, event) {
  const { currentEditor } = context;

  const clientEngineVersion = currentEditor && currentEditor.plugins
    .get('RealTimeCollaborationClient').service._engineVersion;

  return (
    window._CK_ENGINE_VERSION &&
    clientEngineVersion !== window._CK_ENGINE_VERSION
  );
}

function createMachine(options) {
  return Machine({
    id: 'supervisor',
    initial: 'started',
    context: {
      initEditor: options.initEditor,
      windowEvents: options.windowEvents,
      startRecovery: options.startRecovery,
      docEvents: options.docEvents,
      cannotRecover: options.cannotRecover,
      beforeDestroy: options.beforeDestroy,
      online: navigator.onLine,
      currentEditor: null,
      currentError: null,
      errorCount: 0,
      initCount: 0,
      recoveryCount: 0
    },
    states: {
      stopped: { type: 'final' },
      started: {
        initial: 'online',
        on: {
          stop: 'stopped'
        },
        states: {
          offline: {
            on: {
              online: 'online'
            }
          },
          online: {
            invoke: {
              id: 'addEventListeners',
              src: 'addEventListeners'
            },
            initial: 'initializingEditor',
            on: {
              offline: 'offline',
              flushReceived: '.initializingEditor',
            },
            states: {
              initializingEditor: {
                invoke: {
                  id: 'initializeEditor',
                  src: 'initializeEditor',
                  onError: {
                    target: 'error',
                    actions: assign({ currentError: (context, event) => event.data })
                  },
                  onDone: {
                    target: 'editing',
                    actions: assign({ currentEditor: (context, event) => event.data })
                  }
                },
                entry: assign({ initCount: (ctx, event) => ctx.initCount + 1 })
              },
              editing: {
                on: {
                  errorDetected: 'error'
                }
              },
              error: {
                on: {
                  '': [
                    { cond: maxErrors, target: 'manualRefresh' },
                    { cond: versionMismatch, target: 'manualRefresh' },
                    { target: 'recovering' }
                  ]
                },
                entry: assign({ errorCount: (ctx, event) => ctx.errorCount + 1 })
              },
              recovering: {
                entry: [
                  assign({ recoveryCount: (ctx, event) => ctx.recoveryCount + 1 }),
                  'startRecovery'
                ]
              },
              manualRefresh: { type: 'final' },
            }
          }
        }
      }
    }
  }, {
    activities: options.activities,
    actions: options.actions,
    guards: options.guards,
    services: options.services
  });
}

const machine = createMachine({});