Package

error.iserror

An ESnext spec-compliant `Error.isError` shim/polyfill/replacement that works as far down as ES3

v1.0.2, 24 Jul 2025MITCommonJSTypes: NonePolyfills and shims

$ npm install error.iserror

npm GitHub Homepage

Key numbers

As of 25 Sept 2026

Weekly downloads: 1.5k; +3234% over 12 months
Gzip bundle size: -; No Bundlephobia data
Dependencies: 6; Direct, from package.json
Last release: 1 year ago; v1.0.2
GitHub stars: 3; 3 forks
Open issues / PRs: 2 / 1
Contributors: -
Commits, last 52 weeks: 1

Downloads

Last week 2026-09-15 to 2026-09-21

Weekly npm downloads, one point per week, weeks starting 23 Sept 2025 to 15 Sept 2026. The y axis starts at zero.

1,491 downloads last week, 8,329 in the last month. The 12-month change of +3234% compares the average of the last 4 weeks with the first 4 weeks of the series.

Maintenance

Releases, last 12 months: -
Latest version: 1.0.2, 24 Jul 20251 year ago
First published: -
Last push to GitHub: 24 Oct 2025336 days before the snapshot
Repository archived: No
Open issues: 2
Open pull requests: 1
Commits, last 52 weeks: 1
Dependents on npm: 1

Major versions

Recent releases

Compatibility

Module format: CommonJSFrom package.json type, main and exports fields
TypeScript types: None
Node.js engine range: >= 0.4
Runtimes: -
Unpacked size (npm): 21 kB
Dependencies (6): gopdcall-bindes-errorscall-boundhas-tostringtagdefine-properties

Install

npm install error.iserror

CDN

jsDelivrhttps://cdn.jsdelivr.net/npm/error.iserror@1.0.2/
unpkghttps://unpkg.com/error.iserror@1.0.2/
esm.shhttps://esm.sh/error.iserror@1.0.2

Alternatives

Package	Weekly downloads	Gzip	Last release	Module	Comparison
weakmap-polyfill ECMAScript6 WeakMap polyfill	1m	-	5 years ago	CommonJS	-
@thednp/dommatrix TypeScript shim for DOMMatrix	182k	-	22 days ago	ESM + CommonJS	-
map-like ECMAScript Map like object.	23.5k	-	9 years ago	CommonJS	-
object_values polyfill for es8 Object.values	18k	-	9 years ago	CommonJS	-
object-keys An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim	79.8m	-	7 years ago	CommonJS	-
array-buffer-byte-length Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.	63.3m	-	1 year ago	CommonJS	-
@bloomberg/record-tuple-polyfill A polyfill for the Record and Tuple Stage 2 ECMAScript proposal.	76.8k	-	4 years ago	ESM + CommonJS	-
fake-indexeddb Fake IndexedDB: a pure JS in-memory implementation of the IndexedDB API	4.9m	-	10 months ago	ESM + CommonJS	-

Sources: npm registry, npm downloads API, GitHub API. Data fetched 25 Sept 2026.

Indexability: Not indexed (discovery only): downloads_week 1491 < 10000.