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canirequire › Dual (CommonJS + ESM) › pako

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

zlib port to javascript - fast, modularized, with browser support

Last verified Sep 9, 2026 against pako@3.0.1. JSON

Dual (CommonJS + ESM) Dual package — both require() and import work

pako publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("pako") and import "pako" both work on every supported Node.js version and in Bun.

Latest
3.0.1 (Jul 6, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
3.0.1
Native ESM since
2.0.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
100.8M
License
(MIT AND Zlib)

Does pako@3.0.1 actually load? Runtime test results

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

Runtimerequire("pako")import "pako"
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 pako

ES modules (import)

import pako from "pako";

CommonJS (require)

const pako = require("pako");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (34 versions; the newest 34 shown).

VersionsFormatFirst published
2.0.0 – 3.0.1Dual (CommonJS + ESM)Nov 17, 2020
0.0.0 – 1.0.11CommonJSFeb 19, 2014

Frequently asked

Is pako ESM-only?

pako@3.0.1 ships CommonJS and ESM builds. pako publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("pako") and import "pako" both work on every supported Node.js version and in Bun.

Can I require pako?

Yes. pako ships a CommonJS entry, so require("pako") works on every Node.js version, alongside the native ESM entry for import.

Does pako work in Bun?

Yes. import "pako" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does pako ship TypeScript types?

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

Links

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