npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details


  • User packages



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.


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 🙏

© 2019 – Ryan Hefner




Helpers function to get tree changes between two datasets







NPM version build status Maintainability Test Coverage

Get changes between two versions of data with similar shape.


npm install tree-changes


import treeChanges from 'tree-changes';

const savedData = {
    data: { a: 1 },
    hasData: false,
    items: [{ name: 'test' }],
    ratio: 0.9,
    retries: 0,
  	sort: {
      data: [{ type: 'asc' }, { type: 'desc' }],
      status: 'idle',
    switch: false,

const newData = {
    data: { a: 1 },
    hasData: true,
    items: [],
    ratio: 0.5,
    retries: 1,
  	sort: {
      data: [{ type: 'desc' }, { type: 'asc' }],
      status: 'success',

const {
} = treeChanges(savedData, newData);

if (changed('hasData')) {
    // execute some side-effect

if (changedFrom('retries', 0, 1) {
    // should we try again?

// works with array values too
if (changedFrom('sort.status', 'idle', ['done', 'success']) {
    // status has changed!

// support nested match 
if (changedTo('', 'desc') {
    // update the type

if (decreased('ratio')) {
    // do something!

if (increased('retries')) {
    // hey, slow down.

Works with arrays too.

import treeChanges from 'tree-changes';

const { changed, changedTo } = treeChanges([0, { id: 2 }], [0, { id: 4 }]);

changed(); // true
changed(0); // false
changed(1); // true
changedTo('', 4); // true

It uses deep-diff to compare plain objects/arrays and nested-property to get the nested key.

With React

Class components

import treeChanges from 'tree-changes';

class Comp extends React.Component {
    componentDidUpdate(prevProps) {
        const { changedFrom, changedTo } = treeChanges(prevProps, this.props);
        if (changedFrom('retries', 0, 1) {
            // dispatch some error
        if (changedTo('hasData', true)) {
            // send data to analytics or something.

Functional components with hooks

import React, { useEffect, useRef } from 'react';
import treeChanges from 'tree-changes';

function usePrevious(value) {
  const ref = useRef();

  useEffect(() => {
    ref.current = value;

  return ref.current;

function useTreeChanges(props) {
  const prevProps = usePrevious(props) || {};

  return treeChanges(prevProps, props);

const Page = (props) => {
  const { changedTo } = useTreeChanges(props);

  if (changedTo('isLoaded', true)) {
    sendAnalyticsEvent('load', 'MySuperPage')

  return <div>...</div>;


changed(key: KeyType)
Check if the value has changed. Supports objects and arrays.

changedFrom(key: KeyType, previous: InputType, actual?: InputType)
Check if the value has changed from previous to actual.

changedTo(key: KeyType, actual: InputType)
Check if the value has changed to actual.

increased(key: KeyType)
Check if both versions are numbers and the value has increased.

decreased(key: KeyType)
Check if both versions are numbers and the value has decreased.

type KeyType = string | number; type InputType = string | boolean | number | object | Array<string | boolean | number | object>;