npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2026 – Pkg Stats / Ryan Hefner

react-observable-hooks

v1.0.5

Published

react library that allows to create and subscribe to observables, ideally for sharing state across differents components

Readme

About the library

This library is experimental, avoid using it on production unless you take responsability to fix the bugs

How to Use

1. Using useObservable Hook

The useObservable hook allows you to subscribe to an observable and get its state and status in your React component.

import React from 'react';
import { useObservable } from 'react-observable-hooks';

const MyComponent = () => {
    const { state, dispatch } = useObservable('myObservable', 'initialValue');

    return (
        <div>
            <button onClick={() => dispatch('newValue')}>Update Observable</button>
            <p>the new value is: {state}</p>
        </div>
    );
};

2. Using useSubscribeObservable Hook

The useSubscribeObservable hook allows you to subscribe to an observable and execute a handler function when the observable updates.

import React from 'react';
import { useSubscribeObservable } from 'react-observable-hooks';

const MyComponent = () => {
    useSubscribeObservable('myObservable', (value) => {
        console.log('Observable updated with value:', value);
    });

    return <div>Check the console for updates</div>;
};

3. Using createEffectWithTrigger

The createEffectWithTrigger function allows you to create an effect that triggers when a specific observable updates. Always use it outside the components

import React from 'react';
import { useObservable, createEffectWithTrigger } from 'react-observable-hooks';

createEffectWithTrigger('triggerObservable', 'targetObservable', async (val) => {
    // Perform some async operation
    const result = await fetchSomeData(val);
    return result;
});

const TriggerComponent = () => {
    const { state, dispatch } = useObservable('triggerObservable', 'initialValue');

    return (
        <div>
            <button onClick={() => dispatch('newValue')}>Update Observable</button>
        </div>
    );
};
const TargetComponent = () => {
    const { state } = useObservable('targetObservable', 'initialValue');

    return (
        <div>
            data fetched by the effect {state}
        </div>
    );
};

4. Using createDispachableEffect

The createDispachableEffect function allows you to create an effect that can be dispatched manually. Always use it outside the components

import React from 'react';
import { createDispachableEffect } from 'react-observable-hooks';

//always create effects outside components
const dispatchEffect = createDispachableEffect('targetObservable', async (val) => {
    // Perform some async operation
    const result = await fetchSomeData(val);
    return result;
});

const Dispacher = () => {
    return <button onClick={() => dispatchEffect('someValue')}>Run Effect</button>;
};

const Subscriber = () => {
    const { state, isLoading, isError, isResolved } = useObservable('targetObservable', 'initialValue');

    return (
        <div>
            {isLoading && <p>Loading...</p>}
            {isError && <p>Error occurred</p>}
            {isResolved && <p>Data fetched: {state}</p>}
        </div>
    );
};

This documentation provides an overview of how to use the provided observable functions and hooks in your React components.