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

event-historian-pmb

v0.1.1

Published

Watch a standard node.js EventEmitter so you can be notified of events even after they already happened.

Downloads

8

Readme

event-historian-pmb

Watch a standard node.js EventEmitter so you can be notified of events even after they already happened.

For a minimalist, stripped-down version of .asSoonAs(), check package late-once-pmb.

Usage

from test/usage.js:

var eventHistorian = require('event-historian-pmb'), chronicles,
  clock = require('event-test-clock-pmb').flavors.quarterSeconds();

function logPanicOnce(why) {
  test.log({ panic: why });
  this.onPanic = null;
  return false;   // false = no more reason to panic, at least for now.
}

chronicles = eventHistorian({
  subj: clock,    // Subject to study.
  name: 'usageTestEH',
  all: 'dblSec',  // Remember all occurrences of these events.
    // Event name lists can be an array, or a string with names
    // separated by space.
  prev: 'tick fullSec',   // Remember just the latest occurrence.
  first: 'halfSec',       // Remember just the first occurrence.
  firstPrev: 'qtrSec',    // Remember first and latest occurrence.
  singular: 'beginTest',  // Like 'first' but panic if occurs again.
  onPanic: logPanicOnce,
});
test.log('Watching.');

equal(chronicles.asa, chronicles.asSoonAs);
equal(chronicles.paf, chronicles.previousAndFuture);
chronicles.paf('beginTest', test.log.l8r(['Test begins.']));

clock.emit('beginTest', 'Godspeed!');

function lateSubscribe() {
  chronicles.asa('fullSec', test.log.l8r(['late asa full']));
  chronicles.paf('fullSec', test.log.l8r(['late paf full']));
}

clock.schedule([ 'abs',
  4, test.log.l8r('One second passed.'),
  6, lateSubscribe,
  13, function () { clock.emit('beginTest', 'again!'); },
  17, function () { test.verify(); },
  ]);

test.verify = function () {
  clock.stop();

  equal(chronicles.counts(), { beginTest: 2,
    qtrSec: 17, halfSec: 8, fullSec: 4, dblSec: 2 });

  equal.lists(test.log(), [
    'Watching.',
    [ 'Test begins.', 'Godspeed!' ],
    'One second passed.',
    [ 'late asa full', 1 ],
    [ 'late paf full', 1 ],
    [ 'late paf full', 2 ],
    [ 'late paf full', 3 ],
    { panic: 'Singular event occurred again: beginTest' },
    [ 'Test begins.', 'again!' ],
    [ 'late paf full', 4 ],
  ]);

  test.log.clear();
  equal.err(function () { clock.emit('beginTest', 'anew!'); },
    'Error: [EventHistorian usageTestEH]: panic: ' +
    'Singular event occurred again: beginTest anew!');
  equal.lists(test.log(), []);

  test.ok();
};

Known issues

  • needs more/better tests and docs

 

License

ISC