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Decider

API reference for Decider

@delta-base/toolkit

Type Alias: Decider<State, TCommand, TEvent>

Section titled “Type Alias: Decider<State, TCommand, TEvent>”

Decider<State, TCommand, TEvent> = object

Decider pattern for command handling

Type Parameters

Section titled “Type Parameters”

State

Section titled “State”

State

TCommand

Section titled “TCommand”

TCommand extends Command

TEvent

Section titled “TEvent”

TEvent extends Event

Properties

Section titled “Properties”

decide()

Section titled “decide()”

decide: (command, state) => TEvent | TEvent[]

Parameters

Section titled “Parameters”
command
Section titled “command”

TCommand

state
Section titled “state”

State

Returns

Section titled “Returns”

TEvent | TEvent[]

evolve()

Section titled “evolve()”

evolve: (state, event) => State

Parameters

Section titled “Parameters”
state
Section titled “state”

State

event
Section titled “event”

ReadEvent<TEvent>

Returns

Section titled “Returns”

State

initialState()

Section titled “initialState()”

initialState: () => State

Returns

Section titled “Returns”

State