Today, we’re excited to announce a simple, powerful new way to track changes to the npm registry — and build your own amazing new developer tools: hooks .
Hooks are notifications of npm registry events that you’ve subscribed to. Using hooks, you can build integrations that do something useful (or silly) in response to package changes on the registry.
Each time a package is changed, we’ll send an HTTP POST payload to the URI you’ve configured for your hook. You can add hooks to follow specific packages, to follow all the activity of given npm users, or to follow all the packages in an organization or user scope.
For example, you could watch all packages published in the
@npm scope by setting up a hook for
@npm . If you wanted to watch just
lodash , you could set up a hook for
If you have a paid individual or organizational npm account , you can start using hooks right now.
Each user may configure a total of 100 hooks, and how you use them is up to you: you can put all 100 on a single package, or scatter them across 100 different packages. If you use a hook to watch a scope, this counts as a single hook, regardless of hw many packages are in the scope. You can watch any open source package on the npm registry, and any private package that you control (you’ll only receive hooks for packages you have permission to see).
Create your first hook right now using the wombat cli tool.
wombat the usual way:
npm install -g wombat . Then, set up some hooks:
wombat hook add npm https://example.com/webhooks shared-secret-text
@slack organization for updates to their API clients:
wombat hook add @slack https://example.com/webhooks but-sadly-not-very-secret
Watch the ever-prolific substack:
wombat hook add --type=owner substack https://example.com/webhooks this-secret-is-very-shared
Look at all your hooks and when they were last triggered:
wombat hook ls
Protip: Wombat has several other interesting commands.
wombat --help will tell you all about them.
We’re also making public an API for working with hooks. Read the docs for details on how you can use the API to manage your hooks without using
You can use hooks to trigger integration testing, trigger a deploy, make an announcement in a chat channel, or trigger an update of your own packages.
To get you started, here are some of the things we’ve built while developing hooks for you:
npm-hook-slack : the world’s simplest Slackbot for reporting package events to Slack; built on
captain-hook : a much more interesting Slackbot that lets you manage your webhooks as well as receive the posts.
citgm-harness : This is a proof-of-concept of how node.js’s Canary in the Gold Mine suite might use hooks to drive its package tests. Specific package publications trigger continuous integration testing of a different project, which is one way to test that you haven’t broken your downstream dependents.
What do you think?
We’re releasing hooks as a beta, and where we take it from here is up to you. What do you think about it? Are there other events you’d like to watch? Is 100 hooks just right, too many, or not enough?
This is the tip of an excitement iceberg — exciteberg , if you will — of cool new ways to use npm. Watch this space!
npm ♥ you!
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