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Is @protobufjs/codegen ESM-only? Can you require() it?

A minimalistic code generation utility.

Last verified Sep 9, 2026 against @protobufjs/codegen@2.0.5. JSON

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

@protobufjs/codegen ships CommonJS only. require("@protobufjs/codegen") works everywhere. import "@protobufjs/codegen" 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
2.0.5 (Apr 27, 2026)
Module format
CommonJS
Last CommonJS version
2.0.5
TypeScript types
Bundled
Node engines
not declared
License
BSD-3-Clause

Does @protobufjs/codegen@2.0.5 actually load? Runtime test results

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

Runtimerequire("@protobufjs/codegen")import "@protobufjs/codegen"
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 @protobufjs/codegen

ES modules (import)

import codegen from "@protobufjs/codegen";

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 codegen = require("@protobufjs/codegen");

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
1.0.0 – 2.0.5CommonJSDec 11, 2016

Frequently asked

Is @protobufjs/codegen ESM-only?

@protobufjs/codegen@2.0.5 is a CommonJS package. @protobufjs/codegen ships CommonJS only. require("@protobufjs/codegen") works everywhere. import "@protobufjs/codegen" 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 @protobufjs/codegen with ES module syntax?

Yes. import codegen from "@protobufjs/codegen" 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 @protobufjs/codegen work in Bun?

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

Does @protobufjs/codegen ship TypeScript types?

Yes. @protobufjs/codegen bundles its own type declarations; no @types package is needed.

Links

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