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Is set-function-length ESM-only? Can you require() it?

Set a function's length property

Last verified Sep 9, 2026 against set-function-length@1.2.2. Markdown · JSON

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

set-function-length ships CommonJS only. require("set-function-length") 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 "set-function-length" 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("set-function-length") 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 setFunctionLength from "set-function-length"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.2.2 (Mar 9, 2024)
Module format
CommonJS
Last CommonJS version
1.2.2
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
71.0M
License
MIT

Does set-function-length@1.2.2 actually load? Runtime test results

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

Runtimerequire("set-function-length")import "set-function-length"
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 set-function-length

ES modules (import)

import setFunctionLength from "set-function-length";

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 setFunctionLength = require("set-function-length");

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 (7 versions; the newest 7 shown).

VersionsFormatFirst published
1.0.0 – 1.2.2CommonJSOct 13, 2023

Frequently asked

Is set-function-length ESM-only?

set-function-length@1.2.2 is a CommonJS package. set-function-length ships CommonJS only. require("set-function-length") 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 "set-function-length" 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 set-function-length with ES module syntax?

Yes. import setFunctionLength from "set-function-length" 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 set-function-length work in Bun?

Yes. import "set-function-length" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does set-function-length ship TypeScript types?

Yes. set-function-length bundles its own type declarations; no @types package is needed.

Links

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