statelyai/xstate @xstate/graph@1.3.0

on GitHub

Minor Changes

• 111a7d13 #1663 Thanks @davidkpiano! - Options passed into graph functions (e.g., getShortestPaths(machine, options)) can now resolve .events based on the state:

  const countMachine = createMachine({
    initial: 'active',
    context: {
      count: 0
    },
    states: {
      active: {
        on: {
          ADD: {
            actions: assign({
              count: (context, event) => {
                return context.count + event.value;
              }
            })
          }
        }
      }
    }
  });
  
  const shortestPaths = getShortestPaths(countMachine, {
    events: {
      ADD: state => {
        // contrived example: if `context.count` is >= 10, increment by 10
        return state.context.count >= 10
          ? [{ type: 'ADD', value: 10 }]
          : [{ type: 'ADD', value: 1 }];
      }
    }
  });
  
  // The keys to the shortest paths will look like:
  // "active" | { count: 0 }
  // "active" | { count: 1 }
  // "active" | { count: 2 }
  // ...
  // "active" | { count: 10 }
  // "active" | { count: 20 }
  // "active" | { count: 30 }