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Is chai-as-promised ESM-only? Can you require() it?

Extends Chai with assertions about promises.

Last verified Sep 9, 2026 against chai-as-promised@8.0.2. Markdown · JSON

ESM-only ESM-only since 8.0.0 — last CommonJS version is 7.1.2

chai-as-promised dropped its CommonJS build in 8.0.0 (June 2024). The last version with a plain require()-able CommonJS entry is 7.1.2, published May 11, 2024.

On Node.js 20.19+, 22.12+ and newer, require("chai-as-promised") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("chai-as-promised") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("chai-as-promised") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const chaiAsPromised = await import("chai-as-promised"). That works on every Node.js version the package supports.
  3. If you need a synchronous require() or run Node.js 18: npm install chai-as-promised@7.1.2, the last CommonJS release (published May 11, 2024).
  4. TypeScript: npm install -D @types/chai-as-promised
Latest
8.0.2 (Aug 22, 2025)
Module format
ESM-only
Last CommonJS version
7.1.2
ESM-only since
8.0.0 (Jun 9, 2024)
TypeScript types
@types/chai-as-promised
Node engines
not declared
Weekly downloads
1.3M
License
MIT

Does chai-as-promised@8.0.2 actually load? Runtime test results

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

Runtimerequire("chai-as-promised")import "chai-as-promised"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 chai-as-promised

ES modules (import)

import * as chaiAsPromised from "chai-as-promised";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const chaiAsPromised = require("chai-as-promised");

// Any Node.js version the package supports, from an async function:
async function main() {
  const chaiAsPromised = await import("chai-as-promised");
}

// Or pin the last CommonJS release:
// npm install chai-as-promised@7.1.2

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 (33 versions; the newest 33 shown).

VersionsFormatFirst published
8.0.0 – 8.0.2ESM-onlyJun 9, 2024
1.0.0 – 7.1.2CommonJSMar 29, 2012

Frequently asked

Is chai-as-promised ESM-only?

chai-as-promised@8.0.2 is ESM-only. chai-as-promised dropped its CommonJS build in 8.0.0 (June 2024). The last version with a plain require()-able CommonJS entry is 7.1.2, published May 11, 2024.

Which version of chai-as-promised still supports CommonJS / require()?

7.1.2 is the last version of chai-as-promised with a CommonJS build. Install it with "npm install chai-as-promised@7.1.2". Every version from 8.0.0 on is ESM-only.

How do I use chai-as-promised from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const chaiAsPromised = await import("chai-as-promised"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("chai-as-promised") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin chai-as-promised@7.1.2.

Does chai-as-promised work in Bun?

Yes. import "chai-as-promised" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does chai-as-promised ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/chai-as-promised".

Links

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