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Is @opentelemetry/sdk-trace-base ESM-only? Can you require() it?

OpenTelemetry Tracing

Last verified Sep 9, 2026 against @opentelemetry/sdk-trace-base@2.11.0. JSON

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

@opentelemetry/sdk-trace-base ships CommonJS only. require("@opentelemetry/sdk-trace-base") works everywhere. import "@opentelemetry/sdk-trace-base" 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
2.11.0 (Aug 31, 2026)
Module format
CommonJS
Last CommonJS version
2.11.0
TypeScript types
Bundled
Node engines
^18.19.0 || >=20.6.0
License
Apache-2.0

Does @opentelemetry/sdk-trace-base@2.11.0 actually load? Runtime test results

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

Runtimerequire("@opentelemetry/sdk-trace-base")import "@opentelemetry/sdk-trace-base"
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/sdk-trace-base

ES modules (import)

import sdkTraceBase from "@opentelemetry/sdk-trace-base";

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 sdkTraceBase = require("@opentelemetry/sdk-trace-base");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (61 versions; the newest 60 shown).

VersionsFormatFirst published
0.26.0 – 2.11.0CommonJSSep 30, 2021

Frequently asked

Is @opentelemetry/sdk-trace-base ESM-only?

@opentelemetry/sdk-trace-base@2.11.0 is a CommonJS package. @opentelemetry/sdk-trace-base ships CommonJS only. require("@opentelemetry/sdk-trace-base") works everywhere. import "@opentelemetry/sdk-trace-base" 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/sdk-trace-base with ES module syntax?

Yes. import sdkTraceBase from "@opentelemetry/sdk-trace-base" 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/sdk-trace-base work in Bun?

Yes. import "@opentelemetry/sdk-trace-base" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @opentelemetry/sdk-trace-base ship TypeScript types?

Yes. @opentelemetry/sdk-trace-base bundles its own type declarations; no @types package is needed.

Links

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