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

Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.

Last verified Sep 9, 2026 against is-callable@1.2.7. JSON

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

is-callable ships CommonJS only. require("is-callable") works everywhere. import "is-callable" 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
1.2.7 (Sep 23, 2022)
Module format
CommonJS
Last CommonJS version
1.2.7
TypeScript types
@types/is-callable
Node engines
>= 0.4
Weekly downloads
70.8M
License
MIT

Does is-callable@1.2.7 actually load? Runtime test results

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

Runtimerequire("is-callable")import "is-callable"
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-callable

ES modules (import)

import isCallable from "is-callable";

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 isCallable = require("is-callable");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (18 versions; the newest 18 shown).

VersionsFormatFirst published
1.0.0 – 1.2.7CommonJSJan 29, 2015

Frequently asked

Is is-callable ESM-only?

is-callable@1.2.7 is a CommonJS package. is-callable ships CommonJS only. require("is-callable") works everywhere. import "is-callable" 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-callable with ES module syntax?

Yes. import isCallable from "is-callable" 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-callable work in Bun?

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

Does is-callable ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/is-callable".

Links

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