This example presents how the state negotiation works.
https://github.com/TobiaszCudnik/asyncmachine
const { machine } = require('asyncmachine')
// setup the states
const example = machine({
A: { add: ['Foo'] },
B: { add: ['Foo'] },
Foo: {}
})
// setup logging
example.id('').logLevel(2)
// `Foo` agrees to be set indirectly only via `A`
example.Foo_enter = function() {
// the return type has to be boolean
return Boolean(this.to().includes('A'))
}
example.add('B') // -> false
example.add('A') // -> true
console.log(example.is()) // -> ['A', 'Foo']
Log output (level 2):
[add] B
[add:implied] Foo
[transition] Foo_enter
[cancelled] B, Foo by the method Foo_enter
[add] A
[add:implied] Foo
[transition] Foo_enter
[state] +A +Foo
[ 'A', 'Foo' ]
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