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

@hebcal/core

v5.8.2

Published

A perpetual Jewish Calendar API

Downloads

9,017

Readme

@hebcal/core

Hebcal is a perpetual Jewish Calendar. This library converts between Hebrew and Gregorian dates, and generates lists of Jewish holidays for any year (past, present or future). Shabbat and holiday candle lighting and havdalah times are approximated based on location. Torah readings (Parashat HaShavua), Daf Yomi, and counting of the Omer can also be specified. Hebcal also includes algorithms to calculate yahrzeits, birthdays and anniversaries.

Build Status

Hebcal was created in 1994 by Danny Sadinoff as a Unix/Linux program written in C, inspired by similar functionality written in Emacs Lisp. The initial JavaScript port was released in 2014 by Eyal Schachter (age 15). This ECMAScript 2015 implementation was released in 2020 by Michael J. Radwin. @hebcal/core targets both browser-based JavaScript and server-side Node.js.

Many users of this library will utilize the HebrewCalendar and HDate interfaces.

Installation

npm install @hebcal/core

Usage

This package exports 3 categories of output:

  • dist/bundle.min.js: This includes all dependencies in a single JS file. It's quite large (174KB minified), and should only be used if you aren't using a bundler.
  • dist/index.cjs: This includes all of this package's code in a single bundle.
  • dist/es/: This directory contains ES modules for each source file in the package. If you're using Rollup, Vite, or another bundler, you should import from here to reduce output sizes.
    • These files do not include polyfills; if you want to support older browsers, use https://github.com/rollup/plugins/tree/master/packages/babel#babelhelpers

    • To make tree-shaking work better, import from the most specific file possible; avoid importing from index or hebcal. Some APIs may still need to be moved to specific files. For example:

      import {getHolidaysOnDate} from '@hebcal/core/dist/es/holidays';
    • This can save hundreds of kilobytes by dropping Zmanim dependencies if your code doesn't use them.

    • You will need to include @rollup/plugin-node-resolve in your Rollup config.

Synopsis

import {HebrewCalendar, HDate, Location, Event} from '@hebcal/core';

const options: CalOptions = {
  year: 1981,
  isHebrewYear: false,
  candlelighting: true,
  location: Location.lookup('San Francisco'),
  sedrot: true,
  omer: true,
};
const events = HebrewCalendar.calendar(options);

for (const ev of events) {
  const hd = ev.getDate();
  const date = hd.greg();
  console.log(date.toLocaleDateString(), ev.render('en'), hd.toString());
}

API Documentation