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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const docuDrawMachine = Machine({
    id: 'docudraw',
    initial: 'idle',
    states: {
      idle: {
        on: {
          DRAW: 'drawing',
          UPLOAD: 'uploading'
        }
      },
      drawing: {
         on: {
           SAVE: 'saving'
         }
      },
      uploading: {
        on: {
          // Correct me if I'm wrong here, but it looks like the machine automatically goes from uploading to draw when you hit CROP?
          CROP: 'committingUploadEdits'
        }
      },
      committingUploadEdits: {
        on: {
          CROP_LOADED: 'drawing'
        }
      },
      saving: {
        on: {
          SUCCESS: 'idle',
          ERROR: 'error'
        }
      },
      // Error can be it's own state, or something within idle. Up to you.
      error: {
        on: { 
          RETRY: 'saving'
        }
      }
   }
  });