Domain

Domain is a namespace for your events, stores and effects.

Domain can subscribe to event, effect, store or nested domain creation with onCreateEvent, onCreateStore, onCreateEffect, onCreateDomain methods.

It is useful for logging or other side effects.

Unit creators

since

effector 20.7.0

createEvent(name?)

Arguments

1. name? (string): event name

Returns

Event: New event

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createEffect(handler?)

Creates an effect with given handler

Arguments

1. handler? (Function): function to handle effect calls, also can be set with use(handler)

Returns

Effect: A container for async function.

since

effector 21.3.0

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createEffect(name?)

Arguments

1. name? (string): effect name

Returns

Effect: A container for async function.

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createStore(defaultState)

Arguments

1. defaultState (State): store default state

Returns

Store: New store

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createDomain(name?)

Arguments

1. name? (string): domain name

Returns

Domain: New domain

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history

Contains mutable read-only sets of units inside domain.

Formulae

const {stores, events, domains, effects} = domain.history

• When any kind of units created inside domain, it appears in set with the name of type(stores, events, domains, effects) in the same order as created

since

effector 20.3.0

import {createDomain} from 'effector'

const domain = createDomain()

const eventA = domain.event()

const $storeB = domain.store(0)

console.log(domain.history)

// => {stores: Set{storeB}, events: Set{eventA}, domains: Set, effects: Set}

Try it

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Aliases

event(name?)

An alias for domain.createEvent

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effect(name?)

An alias for domain.createEffect

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store(defaultState)

An alias for domain.createStore

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domain(name?)

An alias for domain.createDomain

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Domain hooks

onCreateEvent(hook)

Formulae

domain.onCreateEvent(event => {})

• Function passed to onCreateEvent called every time, as new event created in domain
• Function called with event as first argument
• Result of function call is ignored

Arguments

1. hook (Watcher): A function that receives Event and will be called during every domain.createEvent call

Returns

Subscription: Unsubscribe function.

Example

import {createDomain} from 'effector'

const domain = createDomain()

domain.onCreateEvent(event => {

console.log('new event created')

})

const a = domain.createEvent()

// => new event created

const b = domain.createEvent()

// => new event created

Try it

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onCreateEffect(hook)

Formulae

domain.onCreateEffect(effect => {})

• Function passed to onCreateEffect called every time, as new effect created in domain
• Function called with effect as first argument
• Result of function call is ignored

Arguments

1. hook (Watcher): A function that receives Effect and will be called during every domain.createEffect call

Returns

Subscription: Unsubscribe function.

Example

import {createDomain} from 'effector'

const domain = createDomain()

domain.onCreateEffect(effect => {

console.log('new effect created')

})

const a = domain.createEffect()

// => new effect created

const b = domain.createEffect()

// => new effect created

Try it

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onCreateStore(hook)

Formulae

domain.onCreateStore($store => {})

• Function passed to onCreateStore called every time, as new store created in domain
• Function called with $store as first argument
• Result of function call is ignored

Arguments

1. hook (Watcher): A function that receives Store and will be called during every domain.createStore call

Returns

Subscription: Unsubscribe function.

Example

import {createDomain} from 'effector'

const domain = createDomain()

domain.onCreateStore(store => {

console.log('new store created')

})

const $a = domain.createStore(null)

// => new store created

Try it

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onCreateDomain(hook)

Formulae

domain.onCreateDomain(domain => {})

• Function passed to onCreateDomain called every time, as sub domain created in domain
• Function called with domain as first argument
• Result of function call is ignored

Arguments

1. hook (Watcher): A function that receives Domain and will be called during every domain.createDomain call

Returns

Subscription: Unsubscribe function.

Example

import {createDomain} from 'effector'

const domain = createDomain()

domain.onCreateDomain(domain => {

console.log('new domain created')

})

const a = domain.createDomain()

// => new domain created

const b = domain.createDomain()

// => new domain created

Try it

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