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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'editor',
    initial: 'idle',
    context: {
      document: null,
      errorMessage: null
    },
    states: {
      idle: {
        exit: ["clearErrorMessage"],
        on: {
          FETCH: 'loading'
        }
      },
      loading: {
        on: {
          LOAD_DRAFT: 'editing'
        },
        invoke: {
          src: "fetchDraft",
          onError: {
            target: "idle",
            actions: "assignErrorMessageToContext",
          },
        }
      },
      editing: {
        exit: ["clearErrorMessage"],
        on: {
          SAVE: 'saving',
          PUBLISH: 'publishing'
        }
      },
      saving: {
        on: {
          SUCCESS: 'editing'
        },
        invoke: {
          src: 'saveDraft',
          onError: {
            target: 'editing',
            actions: 'assignErrorMessageToContext'
          },
          onDone: {
            target: 'editing'
          }
        }
      },
      publishing: {
        on: {
          SUCCESS: 'published',
          ERROR: 'editing'
        },
        invoke: {
          src: 'publishDraft',
          onDone: {
            target: "published",
          },
          onError: {
            target: 'editing',
            actions: 'assignErrorMessageToContext'
          }
        }
      },
      published: {
        type: 'final'
      }
    }
  }, {
    actions: {
      clearErrorMessage: assign((context) => ({
        errorMessage: undefined,
      })),
      assignErrorMessageToContext: assign((context, event) => {
        return {
          errorMessage: event.data?.message || "An unknown error occurred",
        };
      }),
    }
  });