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

tracium

v0.2.1

Published

Chromium trace parser

Downloads

5,955

Readme

Tracium

Tracium is the Google Lighthouse tracing parser extracted into a stand-alone library.

Tracium is a modern alternative to Big Rig. Tracium correctly parses modern Chrome Traces (generated by Chrome 66+).

Usage

Install:

$ npm install tracium

Use:

const Tracium = require('tracium');
const traceJSON = JSON.parse(fs.readFileSync('./mytrace.json', 'utf8'));
const tasks = Tracium.computeMainThreadTasks(traceJSON, {
  // |flatten| default to |false|. When false, only top-level tasks will be returned.
  flatten: true,
});

Check out examples at //examples/ folder.

API

tracium.computeMainThreadTasks(traceJson[, options])

  • traceJson <Object> A JSON of a Chromium trace
  • options <Object> Set of options for trace processing
    • flatten <boolean> Defaults to false. Whether to flatten tasks tree.
  • returns: <Array<Object>> An array of tasks:
    • kind <string> describes task attribution. Can be one of the following:
      • 'parseHTML'
      • 'styleLayout'
      • 'paintCompositeRender'
      • 'scriptParseCompile'
      • 'scriptEvaluation'
      • 'garbageCollection'
      • 'other'
    • startTime <number> monotonic start time in milliseconds
    • endTime <number> monotonic end time in milliseconds
    • duration <number> task duration in milliseconds, a.k.a. "wall time"
    • selfTime <number> time spent in the task at the current level of the task tree
    • event <Object> original trace event object associated with the task
    • children <Array<[Task]>> an array of child tasks
    • parent <?[Task]> a parent task if any

Returns an array of tasks that belong to the main thread of the inspected page. If flatten is passed to false, than only top-level tasks will be returned.

{
  event:
   { pid: 29772,
     tid: 775,
     ts: 588826692280,
     ph: 'X',
     cat: 'toplevel',
     name: 'TaskQueueManager::ProcessTaskFromWorkQueue',
     args:
      { src_file: '../../base/trace_event/trace_log.cc',
        src_func: 'SetEnabled' },
     dur: 27,
     tdur: 22,
     tts: 514358 },
  startTime: 0,
  endTime: 0.027,
  children: [],
  duration: 0.027,
  selfTime: 0.027,
  kind: 'other' }