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event-source-polyfill

A polyfill for http://www.w3.org/TR/eventsource/

v1.0.31, 11 Aug 2022MIT-Types: -Polyfills and shimsWebSockets and realtime
$ npm install event-source-polyfill
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Key numbers

As of 25 Sept 2026
Weekly downloads
1.6m
+100% over 12 months
Gzip bundle size
-
No Bundlephobia data
Dependencies
0
Direct, from package.json
Last release
4 years ago
v1.0.31
GitHub stars
-
Open issues / PRs
- / -
Contributors
-
Commits, last 52 weeks
-

Downloads

Last week 2026-09-15 to 2026-09-21
0500k1m1.5m2mSept 2025Mar 2026Sept 2026High 2m (25 Aug 2026)Low 492.2k (23 Dec 2025)
Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

1,550,579 downloads last week, 7,301,756 in the last month. The 12-month change of +100% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months
040 in total
Latest version
1.0.31, 11 Aug 20224 years ago
First published
10 Jun 2014
Last push to GitHub
-
Repository archived
-
Open issues
-
Open pull requests
-
Commits, last 52 weeks
-
Dependents on npm
306

Major versions

  1. v1 first release 1.0.0, 23 Oct 2018
  2. v0 first release 0.0.0, 10 Jun 2014

Recent releases

VersionPublished
1.0.3111 Aug 2022
1.0.3011 Aug 2022
1.0.2911 Aug 2022
1.0.282 Aug 2022
1.0.2617 Mar 2022
1.0.254 Aug 2021
1.0.242 May 2021
1.0.2328 Apr 2021
1.0.229 Dec 2020
1.0.2111 Oct 2020
1.0.2019 Sept 2020
1.0.1917 Sept 2020
1.0.1816 Sept 2020
1.0.1722 Aug 2020

Compatibility

Module format
-Not determined from package.json
TypeScript types
-
Node.js engine range
Not declared
Runtimes
-
Unpacked size (npm)
-
Dependencies (0)
None

Install

npm install event-source-polyfill

CDN

jsDelivr: 243.2k requests in 30 days
  • jsDelivrhttps://cdn.jsdelivr.net/npm/event-source-polyfill@1.0.31/
  • unpkghttps://unpkg.com/event-source-polyfill@1.0.31/
  • esm.shhttps://esm.sh/event-source-polyfill@1.0.31

Alternatives

PackageWeekly downloadsGzipLast releaseModuleComparison
eventsource-polyfill201.2k-11 years agoCommonJS-
@moq/web-socket-stream25.6k-2 months agoESM only-
@rexxars/eventsource-polyfill21.8k-6 years agoCommonJS-
Sources: npm registry, npm downloads API, jsDelivr. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): GitHub data not fetched yet.