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 🙏

© 2024 – Pkg Stats / Ryan Hefner




Library and tool to build a third party notices file based on a js bundle's source map





Build npm version

@rnx-kit/third-party-notices provides a helper library to create a third-party-notices text file based on a output bundle. It also provides a cli interface to the library for integration into build steps like just-scripts

This function will read the sourcemap file and tries to find all files that are referenced in the sourcemap by assuming that all dependencies are represented as node_modules\moduleName or node_modules\@scope\moduleName It will then look in the package.json file to see if it finds a licence claration or it will look for the file called LICENCE in the root. And aggregate all ese files in the output file.

This package works for npm, yarn and pnpm package layouts formats.

At the moment this package only supports webpack based bundles, there is nothing preventing adding metro support, the current customers of this module are basedon webpack at the moment.



npx @rnx-kit/third-party-notices \
    --rootPath <myPackage> \
    --sourceMapFile <myPackage/dist/>
  --help            Show help                                          [boolean]
  --version         Show version number                                [boolean]
  --rootPath        The root of the repo where to start resolving modules from.
                                                             [string] [required]
  --sourceMapFile   The sourceMap file to generate licence contents for.
                                                             [string] [required]
  --outputFile      The output file to write the licence file to.       [string]
  --json            Output license information as a JSON
                                                      [boolean] [default: false]
  --ignoreScopes    Npm scopes to ignore and not emit licence information for
  --ignoreModules   Modules (js packages) to not emit licence information for
  --preambleText    A list of lines to prepend at the start of the generated
                    licence file.                                        [array]
  --additionalText  A list of lines to append at the end of the generated
                    licence file.                                        [array]

As a library

import { writeThirdPartyNotices } from "@rnx-kit/third-party-notices";

  rootPath: ".",
  sourceMapFile: "./dist/",

As a plugin

Import and add the plugin to ThirdPartyNotices in your metro.config.js, and optionally configure it to your liking:

 const { makeMetroConfig } = require("@rnx-kit/metro-config");
+const { ThirdPartyNotices } = require("@rnx-kit/third-party-notices");
+const { MetroSerializer } = require("@rnx-kit/metro-serializer");

 module.exports = makeMetroConfig({
   serializer: {
+    customSerializer: MetroSerializer([
+      ThirdPartyNotices(),
+    ]),