jbr / stately.js

state machine dsl for node

Stately.js

Stately is a state machine for node.js. It’s currently fairly simple, but eventually should be feature comparable with aasm. Pretty much everything requires/is a state machine, so a reusable state machine module reduces duplication.

Check out example.js for usage, stately.js for implementation.

Callback chain

Given a transition from state “from” to state “to”:

1. beforeTransition
   • callback arguments: "from", "to"
   • machine.beforeTransition (fn)
2. beforeTransition:from:to or machine.beforeTransition
   • machine.beforeTransition ('from', 'to', fn)
3. beforeExit:from
   • machine.beforeExit ('from', fn)
4. beforeEnter:to
   • machine.beforeEnter ('to', fn)
5. afterExit:from
   • machine.afterExit ('from', fn)
6. afterEnter:to
   • machine.afterEnter ('to', fn)
7. afterTransition:from:to
   • machine.afterTransition ('from', 'to', fn)
8. afterTransition
   • callback arguments: "from", "to"
   • machine.afterTransition ('from', 'to', fn)