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Is @nestjs/testing ESM-only? Can you require() it?

Nest - modern, fast, powerful node.js web framework (@testing)

Last verified Sep 9, 2026 against @nestjs/testing@12.0.1. Markdown · JSON

ESM-only ESM-only since 12.0.0 — last CommonJS version is 11.2.3

@nestjs/testing dropped its CommonJS build in 12.0.0 (August 2026). The last version with a plain require()-able CommonJS entry is 11.2.3, published Aug 25, 2026.

On Node.js 20.19+, 22.12+ and newer, require("@nestjs/testing") 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("@nestjs/testing") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("@nestjs/testing") 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 testing = await import("@nestjs/testing"). That works on every Node.js version the package supports.
  3. If you need a synchronous require() or run Node.js 18: npm install @nestjs/testing@11.2.3, the last CommonJS release (published Aug 25, 2026).
  4. TypeScript: types are bundled; install nothing extra.
Latest
12.0.1 (Aug 27, 2026)
Module format
ESM-only
Last CommonJS version
11.2.3
ESM-only since
12.0.0 (Aug 27, 2026)
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
6.4M
License
MIT

Does @nestjs/testing@12.0.1 actually load? Runtime test results

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

Runtimerequire("@nestjs/testing")import "@nestjs/testing"
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 @nestjs/testing

ES modules (import)

import * as testing from "@nestjs/testing";

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 testing = require("@nestjs/testing");

// Any Node.js version the package supports, from an async function:
async function main() {
  const testing = await import("@nestjs/testing");
}

// Or pin the last CommonJS release:
// npm install @nestjs/testing@11.2.3

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 (361 versions; the newest 60 shown).

VersionsFormatFirst published
12.0.0 – 12.0.1ESM-onlyAug 27, 2026
10.4.21 – 11.2.3CommonJSJan 8, 2026

Frequently asked

Is @nestjs/testing ESM-only?

@nestjs/testing@12.0.1 is ESM-only. @nestjs/testing dropped its CommonJS build in 12.0.0 (August 2026). The last version with a plain require()-able CommonJS entry is 11.2.3, published Aug 25, 2026.

Which version of @nestjs/testing still supports CommonJS / require()?

11.2.3 is the last version of @nestjs/testing with a CommonJS build. Install it with "npm install @nestjs/testing@11.2.3". Every version from 12.0.0 on is ESM-only.

How do I use @nestjs/testing from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const testing = await import("@nestjs/testing"). That works on every Node.js version the package supports. On Node.js 20.19+, 22.12+ and newer, require("@nestjs/testing") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin @nestjs/testing@11.2.3.

Does @nestjs/testing work in Bun?

Yes. import "@nestjs/testing" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @nestjs/testing ship TypeScript types?

Yes. @nestjs/testing bundles its own type declarations; no @types package is needed.

Links

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