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Is power-assert ESM-only? Can you require() it?

Power Assert in JavaScript

Last verified Sep 9, 2026 against power-assert@1.6.1. JSON

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

power-assert ships CommonJS only. require("power-assert") works everywhere. import "power-assert" 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
1.6.1 (Sep 8, 2018)
Module format
CommonJS
Last CommonJS version
1.6.1
TypeScript types
@types/power-assert
Node engines
not declared
Weekly downloads
116K
License
MIT

Does power-assert@1.6.1 actually load? Runtime test results

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

Runtimerequire("power-assert")import "power-assert"
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 power-assert

ES modules (import)

import powerAssert from "power-assert";

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 powerAssert = require("power-assert");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (40 versions; the newest 40 shown).

VersionsFormatFirst published
0.1.0 – 1.6.1CommonJSAug 21, 2013

Frequently asked

Is power-assert ESM-only?

power-assert@1.6.1 is a CommonJS package. power-assert ships CommonJS only. require("power-assert") works everywhere. import "power-assert" 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 power-assert with ES module syntax?

Yes. import powerAssert from "power-assert" 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 power-assert work in Bun?

Yes. import "power-assert" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does power-assert ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/power-assert".

Links

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