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Is @opentelemetry/api ESM-only? Can you require() it?

Public API for OpenTelemetry

Last verified Sep 9, 2026 against @opentelemetry/api@1.9.1. JSON

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

@opentelemetry/api ships CommonJS only. require("@opentelemetry/api") works everywhere. import "@opentelemetry/api" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

Latest
1.9.1 (Mar 25, 2026)
Module format
CommonJS
Last CommonJS version
1.9.1
TypeScript types
Bundled
Node engines
>=8.0.0
License
Apache-2.0

Does @opentelemetry/api@1.9.1 actually load? Runtime test results

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

Runtimerequire("@opentelemetry/api")import "@opentelemetry/api"
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 @opentelemetry/api

ES modules (import)

import api from "@opentelemetry/api";

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 api = require("@opentelemetry/api");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (43 versions; the newest 43 shown).

VersionsFormatFirst published
0.4.0 – 1.9.1CommonJSFeb 5, 2020

Frequently asked

Is @opentelemetry/api ESM-only?

@opentelemetry/api@1.9.1 is a CommonJS package. @opentelemetry/api ships CommonJS only. require("@opentelemetry/api") works everywhere. import "@opentelemetry/api" 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 @opentelemetry/api with ES module syntax?

Yes. import api from "@opentelemetry/api" 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 @opentelemetry/api work in Bun?

Yes. import "@opentelemetry/api" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @opentelemetry/api ship TypeScript types?

Yes. @opentelemetry/api bundles its own type declarations; no @types package is needed.

Links

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