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Is mimic-response ESM-only? Can you require() it?

Mimic a Node.js HTTP response stream

Last verified Sep 9, 2026 against mimic-response@4.0.0. Markdown · JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.1.0

mimic-response dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.1.0, published May 14, 2020; it declares support for Node.js >=10.

On Node.js 20.19+, 22.12+ and newer, require("mimic-response") 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("mimic-response") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("mimic-response") 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 mimicResponse = await import("mimic-response"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0).
  3. If you need a synchronous require() or run Node.js 18: npm install mimic-response@3.1.0, the last CommonJS release (published May 14, 2020); it declares Node.js >=10.
  4. TypeScript: no types are available for mimic-response; declare the module yourself if you need them.
Latest
4.0.0 (Aug 11, 2021)
Module format
ESM-only
Last CommonJS version
3.1.0
ESM-only since
4.0.0 (Aug 11, 2021)
TypeScript types
None
Node engines
^12.20.0 || ^14.13.1 || >=16.0.0
Weekly downloads
37.6M
License
MIT

Does mimic-response@4.0.0 actually load? Runtime test results

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

Runtimerequire("mimic-response")import "mimic-response"
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 mimic-response

ES modules (import)

import * as mimicResponse from "mimic-response";

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 mimicResponse = require("mimic-response");

// Any Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0), from an async function:
async function main() {
  const mimicResponse = await import("mimic-response");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install mimic-response@3.1.0

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 (7 versions; the newest 7 shown).

VersionsFormatFirst published
4.0.0ESM-onlyAug 11, 2021
1.0.0 – 3.1.0CommonJSJun 2, 2017

Frequently asked

Is mimic-response ESM-only?

mimic-response@4.0.0 is ESM-only. mimic-response dropped its CommonJS build in 4.0.0 (August 2021). The last version with a plain require()-able CommonJS entry is 3.1.0, published May 14, 2020; it declares support for Node.js >=10.

Which version of mimic-response still supports CommonJS / require()?

3.1.0 is the last version of mimic-response with a CommonJS build; it declares Node.js >=10. Install it with "npm install mimic-response@3.1.0". Every version from 4.0.0 on is ESM-only.

How do I use mimic-response from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const mimicResponse = await import("mimic-response"). That works on every Node.js version the package supports (^12.20.0 || ^14.13.1 || >=16.0.0). On Node.js 20.19+, 22.12+ and newer, require("mimic-response") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin mimic-response@3.1.0 (declares Node.js >=10).

Does mimic-response work in Bun?

Yes. import "mimic-response" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does mimic-response ship TypeScript types?

No. mimic-response ships no type declarations and there is no @types package for it.

Links

Other esm-only packages

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