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

machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'editor',
    initial: 'idle',
    context: {
      retries: 0,
      localState: {},
      prevSaved: {}
    },
    states: {
      idle: {
        on: {
          FETCH: {
            target: 'fetching'
          }
        },
        initial: 'noError',
        states: {
          noError: {
            entry: ['clearErrorMessage'],
          },
          errored: {
            on: {
              FETCH: {
                target: '#fetching',
                actions: assign({
                  retries: (context, event) => context.retries + 1
                })
              }
            }
          }
        }
      },
      fetching: {
        id: "fetching",
        on: {
          FETCH: 'fetching',
          CANCEL: {
            target: 'idle'
          },
          RECEIVE_DATA: {
            target: 'editing',
            actions: 'assignDataToContext'
          }
        },
        invoke: {
          src: 'fetchData',
          onError: {
            target: 'idle.errored',
            actions: 'assignErrorToContext'
          }
        }
      },
      editing: {
        id: 'editing',
        initial: 'idle',
        states: {
          idle: {
            on: {
              UPDATE: {
                actions: 'updateValueToContext',
                target: 'debouncing',
              },
              PUBLISH: {
                target: '#published'
              }
            },
          },
          debouncing: {
            on: {
              UPDATE: {
                actions: 'updateValueToContext',
                target: 'debouncing',
              },
            },
            after: {
              1000: {
                target: 'idle',
                actions: 'saveValue',
              },
            },
          },
        },
      },
      published: {
        id: 'published',
        type: 'final'
      },
    }
  }, {
    services: {
      fetchData: () => () => {}
    },
    actions: {
      updateValueToContext: assign((context, event) => {
        return {
          localState: event.value
        }
      }),
      saveValue: assign((context, event) => {
        return {
          localState: event.payload,
          savedState: event.payload
        }
      }),
      assignDataToContext: assign((context, event) => {
        if (event.type !== 'RECEIVE_DATA') return {};
        return {
          data: event.data,
        };
      }),
      clearErrorMessage: assign({
        errorMessage: undefined,
      }),
      assignErrorToContext: assign((context, event) => {
        return {
          errorMessage: event.data?.message || 'An unknown error occurred',
        };
      }),
    }
  });