Types

Accessor / Setter / Signal / SourceAccessor

A zero-arg getter for a reactive value. Calling it inside a tracking scope (memo, effect compute, JSX expression) subscribes the scope to changes.

Reading outside any tracking scope simply returns the current value without creating a subscription.

Import

import type { Accessor } from "solid-js";

Type signature

type Accessor<T> = () => T;

A signal setter. Accepts either a new value or an updater (prev) => next.

If the type permits undefined, setState() (no args) clears to undefined.

To store a function as the value itself (rather than as an updater), wrap it with an updater: setHandler(() => myHandler).

Import

import type { Setter } from "solid-js";

Type signature

type Setter<in out T> = {
  <U extends T>(
    ...args: undefined extends T
      ? []
      : [value: Exclude<U, Function> | ((prev: T) => U)]
  ): undefined extends T ? undefined : U;
  <U extends T>(value: (prev: T) => U): U;
  <U extends T>(value: Exclude<U, Function>): U;
  <U extends T>(value: Exclude<U, Function> | ((prev: T) => U)): U;
};

A [get, set] pair returned from createSignal / createOptimistic.

Import

import type { Signal } from "solid-js";

Type signature

type Signal<T> = [get: SourceAccessor<T>, set: Setter<T>];

SourceAccessor API reference.

Import

import type { SourceAccessor } from "solid-js";

Type signature

type SourceAccessor<T> = Refreshable<Accessor<T>>;

Last updated: 7/4/26, 6:21 PMEdit this pageReport an issue with this page