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Is on-finished ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against on-finished@2.4.1. Markdown · JSON

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

on-finished ships CommonJS only. require("on-finished") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8. import "on-finished" 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("on-finished") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.
  2. From ES modules use the default import: import onFinished from "on-finished"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/on-finished
Latest
2.4.1 (Feb 22, 2022)
Module format
CommonJS
Last CommonJS version
2.4.1
TypeScript types
@types/on-finished
Node engines
>= 0.8
Weekly downloads
96.7M
License
MIT

Does on-finished@2.4.1 actually load? Runtime test results

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

Runtimerequire("on-finished")import "on-finished"
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 on-finished

ES modules (import)

import onFinished from "on-finished";

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 onFinished = require("on-finished");

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 (8 versions; the newest 8 shown).

VersionsFormatFirst published
2.0.0 – 2.4.1CommonJSAug 16, 2014

Frequently asked

Is on-finished ESM-only?

on-finished@2.4.1 is a CommonJS package. on-finished ships CommonJS only. require("on-finished") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8. import "on-finished" 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 on-finished with ES module syntax?

Yes. import onFinished from "on-finished" 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 on-finished work in Bun?

Yes. import "on-finished" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does on-finished ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/on-finished".

Links

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