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

Zero-configuration bundler for tiny JS libs, powered by Rollup.

Last verified Sep 9, 2026 against microbundle@0.15.1. Markdown · JSON

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

microbundle ships CommonJS only. require("microbundle") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "microbundle" 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.

What to do

  1. require("microbundle") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import microbundle from "microbundle"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for microbundle; declare the module yourself if you need them.
Latest
0.15.1 (Aug 12, 2022)
Module format
CommonJS
Last CommonJS version
0.15.1
TypeScript types
None
Node engines
not declared
Weekly downloads
115K
License
MIT

Does microbundle@0.15.1 actually load? Runtime test results

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

Runtimerequire("microbundle")import "microbundle"
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 1.4.0✓ works✓ works

How to import microbundle

ES modules (import)

import microbundle from "microbundle";

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 microbundle = require("microbundle");

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 (40 versions; the newest 40 shown).

VersionsFormatFirst published
0.1.0 – 0.15.1CommonJSDec 11, 2017

Frequently asked

Is microbundle ESM-only?

microbundle@0.15.1 is a CommonJS package. microbundle ships CommonJS only. require("microbundle") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "microbundle" 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 microbundle with ES module syntax?

Yes. import microbundle from "microbundle" 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 microbundle work in Bun?

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

Does microbundle ship TypeScript types?

No. microbundle ships no type declarations and there is no @types package for it.

Links

Other commonjs packages

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