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Is array.prototype.findlastindex ESM-only? Can you require() it?

An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.

Last verified Sep 9, 2026 against array.prototype.findlastindex@1.2.6. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

array.prototype.findlastindex ships CommonJS only. require("array.prototype.findlastindex") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "array.prototype.findlastindex" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("array.prototype.findlastindex") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4.
  2. From ES modules use the default import: import arrayPrototypeFindlastindex from "array.prototype.findlastindex"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for array.prototype.findlastindex; declare the module yourself if you need them.
Latest
1.2.6 (Mar 14, 2025)
Module format
CommonJS
Last CommonJS version
1.2.6
Native ESM since
1.1.0
TypeScript types
None
Node engines
>= 0.4
Weekly downloads
37.7M
License
MIT

Does array.prototype.findlastindex@1.2.6 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("array.prototype.findlastindex") from a CommonJS file and import "array.prototype.findlastindex" from an ES module.

Runtimerequire("array.prototype.findlastindex")import "array.prototype.findlastindex"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import array.prototype.findlastindex

ES modules (import)

import arrayPrototypeFindlastindex from "array.prototype.findlastindex";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const arrayPrototypeFindlastindex = require("array.prototype.findlastindex");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (10 versions; the newest 10 shown).

VersionsFormatFirst published
1.2.5 – 1.2.6CommonJSMar 19, 2024
1.1.0 – 1.2.4Dual (CommonJS + ESM)Aug 7, 2021
1.0.0CommonJSJul 14, 2021

Frequently asked

Is array.prototype.findlastindex ESM-only?

array.prototype.findlastindex@1.2.6 is a CommonJS package. array.prototype.findlastindex ships CommonJS only. require("array.prototype.findlastindex") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.4. import "array.prototype.findlastindex" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import array.prototype.findlastindex with ES module syntax?

Yes. import arrayPrototypeFindlastindex from "array.prototype.findlastindex" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does array.prototype.findlastindex work in Bun?

Yes. import "array.prototype.findlastindex" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does array.prototype.findlastindex ship TypeScript types?

No. array.prototype.findlastindex ships no type declarations and there is no @types package for it.

Links

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