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 🙏

© 2024 – Pkg Stats / Ryan Hefner

@contrast/core

v1.41.1

Published

Preconfigured Contrast agent core services and models

Downloads

84,424

Readme

@contrast/core

Discovers Contrast configuration data (yaml, env vars, etc) and preconfigures a common set of APIs to be used for agent and tooling development.

Basic Usage

The module exports a factory function.

const core = require('@contrast/core')();

What You Get

  • Logging

    core.logger.info('...');

    See more about the @contrast/logger service here.

  • Monkey-patching

    core.patcher.patch(res, 'end', {
      name: 'http.ServerResponse.end',
      patchType: 'http-things',
      pre(data) {
        // ...
      }
    });

    See more about the @contrast/patcher service here.

  • Code rewriting

    core.rewriter.addTransforms({
      CallExpression(path, state) {
        // ...
      };
    });
    core.rewriter.rewrite('function() { ...');

    See more about the @contrast/rewriter service here.

  • Dependency hooks

    core.depHooks.resolve({ name: 'http' }, http => {
      // implemention details
    });

    See more about the @contrast/dep-hooks service here.

  • Models and factories

    The construction of model data can rely on configuration and therefore can be stateful. So, we provide the models and their factories as services that can be used by consumers as if static.

    // stackframe filtration is configurable, thus stateful
    const snap = core.models.StacktraceFactory.createSnapshot();
    const frames = snap();

    See more about the @contrast/models service here.

  • Report messages

    // configuration will tell which reporters become active
    core.reporters.install();
    core.messages.emit('ProtectInputTracingEvent', { ... });

    See more about the @contrast/reporter service here.

  • Other stuff

    There are some utility-type functions that rely on configuration state.

    // This uses core.config.stack_trace_filters (new to v5)
    core.isAgentPath('/foo'); 

Related

  • @contrast/agentify: Integrate core services and instrumentation into an application. See more here.