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Is is-generator-function ESM-only? Can you require() it?

Determine if a function is a native generator function.

Last verified Sep 9, 2026 against is-generator-function@1.1.2. JSON

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

is-generator-function ships CommonJS only. require("is-generator-function") works everywhere. import "is-generator-function" 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.

Latest
1.1.2 (Sep 30, 2025)
Module format
CommonJS
Last CommonJS version
1.1.2
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
81.7M
License
MIT

Does is-generator-function@1.1.2 actually load? Runtime test results

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

Runtimerequire("is-generator-function")import "is-generator-function"
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✓ works✓ works

How to import is-generator-function

ES modules (import)

import isGeneratorFunction from "is-generator-function";

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 isGeneratorFunction = require("is-generator-function");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (15 versions; the newest 15 shown).

VersionsFormatFirst published
0.0.0 – 1.1.2CommonJSFeb 10, 2014

Frequently asked

Is is-generator-function ESM-only?

is-generator-function@1.1.2 is a CommonJS package. is-generator-function ships CommonJS only. require("is-generator-function") works everywhere. import "is-generator-function" 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 is-generator-function with ES module syntax?

Yes. import isGeneratorFunction from "is-generator-function" 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 is-generator-function work in Bun?

Yes. import "is-generator-function" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-generator-function ship TypeScript types?

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

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