Effector provides several utility types to facilitate getting a type of value from the unit.

UnitValue<Type>

Taking out of Unit value type.

Example

import { createEffect, createStore, createEvent, fork, UnitValue } from "effector";

const event = createEvent<{ id: string; name?: string } | { id: string }>();
const $store = createStore([false, true]);
const effect = createEffect<{ token: string }, any, string>(() => {});
const scope = fork();

type UnitEventType = UnitValue<typeof event>;
// {id: string; name?: string | undefined} | {id: string}

type UnitStoreType = UnitValue<typeof store>;
// boolean[]

type UnitEffectType = UnitValue<typeof effect>;
// {token: string}

type UnitScopeType = UnitValue<typeof scope>;
// any

StoreValue<Type>

Taking out of Store value type.

Example

import { createStore, StoreValue } from "effector";

const $store = createStore(true);

type StoreValueType = StoreValue<typeof $store>;
// boolean

EventPayload<Type>

Taking out of Event payload type.

Example

import { createEvent, EventPayload } from "effector";

const event = createEvent<{ id: string }>();

type EventPayloadType = EventPayload<typeof event>;
// {id: string}

EffectParams<Type>

Taking out of Effect params type.

Example

import { createEffect, EffectParams } from "effector";

const fx = createEffect<
  { id: string },
  { name: string; isAdmin: boolean },
  { statusText: string; status: number }
>(() => ({ name: "Alice", isAdmin: false }));

type EffectParamsType = EffectParams<typeof fx>;
// {id: string}

EffectResult<Type>

Taking out of Effect result type.

Example

import { createEffect, EffectResult } from "effector";

const fx = createEffect<
  { id: string },
  { name: string; isAdmin: boolean },
  { statusText: string; status: number }
>(() => ({ name: "Alice", isAdmin: false }));

type EffectResultType = EffectResult<typeof fx>;
// {name: string; isAdmin: boolean}

EffectError<Type>

Taking out of Effect error type.

Example

import { createEffect, EffectError } from "effector";

const fx = createEffect<
  { id: string },
  { name: string; isAdmin: boolean },
  { statusText: string; status: number }
>(() => ({ name: "Alice", isAdmin: false }));

type EffectErrorType = EffectError<typeof fx>;
// {statusText: string; status: number}