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Is callsites ESM-only? Can you require() it?

Get callsites from the V8 stack trace API

Last verified Sep 9, 2026 against callsites@4.2.0. Markdown · JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.1.0

callsites dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.1.0, published Apr 6, 2019; it declares support for Node.js >=6.

On Node.js 20.19+, 22.12+ and newer, require("callsites") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("callsites") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("callsites") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const callsites = await import("callsites"). That works on every Node.js version the package supports (>=12.20).
  3. If you need a synchronous require() or run Node.js 18: npm install callsites@3.1.0, the last CommonJS release (published Apr 6, 2019); it declares Node.js >=6.
  4. TypeScript: types are bundled; install nothing extra.
Latest
4.2.0 (Jun 29, 2024)
Module format
ESM-only
Last CommonJS version
3.1.0
ESM-only since
4.0.0 (Aug 8, 2021)
TypeScript types
Bundled
Node engines
>=12.20
Weekly downloads
136.7M
License
MIT

Does callsites@4.2.0 actually load? Runtime test results

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

Runtimerequire("callsites")import "callsites"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 callsites

ES modules (import)

import * as callsites from "callsites";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const callsites = require("callsites");

// Any Node.js version the package supports (>=12.20), from an async function:
async function main() {
  const callsites = await import("callsites");
}

// Or pin the last CommonJS release (declares Node.js >=6):
// npm install callsites@3.1.0

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
4.0.0 – 4.2.0ESM-onlyAug 8, 2021
0.1.0 – 3.1.0CommonJSApr 19, 2014

Frequently asked

Is callsites ESM-only?

callsites@4.2.0 is ESM-only. callsites dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.1.0, published Apr 6, 2019; it declares support for Node.js >=6.

Which version of callsites still supports CommonJS / require()?

3.1.0 is the last version of callsites with a CommonJS build; it declares Node.js >=6. Install it with "npm install callsites@3.1.0". Every version from 4.0.0 on is ESM-only.

How do I use callsites from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const callsites = await import("callsites"). That works on every Node.js version the package supports (>=12.20). On Node.js 20.19+, 22.12+ and newer, require("callsites") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin callsites@3.1.0 (declares Node.js >=6).

Does callsites work in Bun?

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

Does callsites ship TypeScript types?

Yes. callsites bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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