Ustor NPM | npm.io

UStor

Reactive Store Library

This library provides a powerful reactivity system for creating stateful objects using signals, integrated seamlessly into JavaScript objects and arrays. This library does not depend on any specific reactive library and can be used by any UI framework to manage and react to changes in state effectively.

Installation

To use this library, you can install it using npm or yarn:

npm install ustor
yarn add ustor

This library can be integrated with solid-js, @preact/signals-core, ulive, usignal, oby, sinuous any other libarary you can think of for managing reactive signals.

Setup

First, import the store function and the api object. You need to initialize api with your preferred signal implementation.

import { store, api } from "./src";
import { createSignal } from "solid-js";
// import { signal } from '@preact/signals-core'; // 'usignal' 'ulive'

// Solid.js setup
api.signal = createSignal;
api.get = (v) => v[0]();
api.set = (signal, v) => signal[1](v);
api.is = (v) =>
	(Array.isArray(v) &&
		typeof v[0] === "function" &&
		typeof v[1] === "function") ||
	v[0]?.name?.includes("readSignal");

// @preact/signals-core, usignal or ulive setup
api.signal = signal;
api.get = (v) => v.value;
api.set = (signal, v) => (signal.value = v);
api.is = (v) => v?.peek;

API

`store(values, proto)`

The store function creates a stateful object that automatically converts properties into reactive signals.

values: The initial values for the store, which can be objects, arrays, or primitives.
proto: Optional prototype to set for the new store object.

The function returns a reactive store object that maintains the structure of the original values while adding reactivity.

`is(value)`

The is function checks if a given value is a reactive store instance.

value: The value to check.

Returns true if the value is a reactive store, otherwise false.

`api.is`

The api.is function checks if a given value is a signal.

value: The value to check.

Returns true if the value is a signal, otherwise false.

`api.signal`

The api.signal function is used to create a reactive signal.

value: The initial value for the signal.

Returns a signal that can be used to create reactive state within the store.

`api.get`

The api.get function retrieves the current value of a signal.

signal: The signal whose value you want to retrieve.

Returns the current value of the signal.

`api.set`

The api.set function updates the value of a signal.

signal: The signal whose value you want to update.
value: The new value to set.

Updates the signal with the provided value.

Usage

Basic Usage

const s = store({ a: 1, b: 2 });
console.log(s.a); // 1
s.a = 5;
console.log(s.a); // 5

You can use the store function to create a reactive state object. Assigning a new value to s.a will automatically trigger updates wherever s.a is used.

Advanced Usage

const s = store({
	a: 2,
	b: 3,
	get sum() {
		return this.a + this.b;
	},
});

console.log(s.sum); // 5
s.a = 5;
console.log(s.sum); // 8

Here, you can define getters that automatically compute derived state values, and these getters will update whenever the underlying signals change.

Deeply Nested Structures

The store function can also handle deeply nested objects, converting nested properties into reactive signals:

const s = store({ nested: { deep: { value: 10 } } });
const deepValue = s.nested.deep.value * 2;

console.log(deepValue); // 20
s.nested.deep.value = 15;
console.log(s.nested.deep.value) * 2; // 30

Arrays and Objects

This library can handle arrays and objects seamlessly, automatically wrapping array elements with reactivity:

const s = store({ list: [1, 2, 3] });
const sum = s.list.reduce((acc, item) => acc + item, 0);

console.log(sum); // 6
s.list = [1, 5, 3];
console.log(s.list.reduce((acc, item) => acc + item, 0)); // 9

Reactivity and Effects

The signal value trigger with effects to track dependencies and automatically re-run whenever dependencies change:

const s = store({ a: 1 });
let effectValue = 0;

effect(() => {
	effectValue = s.a * 2;
});

console.log(effectValue); // 2
s.a = 4;
console.log(effectValue); // 8

Integration with Solid.js, Preact Signals or any

This library can be used with Solid.js, Preact Signals, or any other UI framework to provide reactive signals.

To use Solid.js:

import { createSignal } from "solid-js";

api.signal = createSignal;
api.get = (v) => v?.[0]();
api.set = (signal, v) => signal?.[1](v);
api.is = (v) =>
	(Array.isArray(v) &&
		typeof v[0] === "function" &&
		typeof v[1] === "function") ||
	v?.[0]?.name?.includes("readSignal");

To use Preact Signals, usignal, ulive, etc:

import { signal } from "@preact/signals-core";

api.signal = signal;
api.get = (v) => v?.value;
api.set = (signal, v) => (signal.value = v);
api.is = (v) => v?.peek;

To use any signal library

import ... from "...";

api.signal = ...;
api.get = ...;
api.set = (signal, value) => ...;
api.is = (v) => ...;

const state = store({
	count: 0
});

The library provides a unified API to work with different reactive systems, allowing you to switch between Solid.js, Preact Signals, or any other UI framework easily.