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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. 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 you can require() on every Node.js version, including 18 and older, is 3.1.0, published May 14, 2020.

On Node.js 20.19+, 22.12+ and every newer release, require("mimic-response") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

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✓ works✓ works

How to import mimic-response

ES modules (import)

import mimicResponse from "mimic-response";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const mimicResponse = require("mimic-response");

// Any Node.js version:
const mimicResponse = await import("mimic-response");

// Or pin the last CommonJS release:
// 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 (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 you can require() on every Node.js version, including 18 and older, is 3.1.0, published May 14, 2020.

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

3.1.0 is the last version of mimic-response with a CommonJS build. 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?

Use a dynamic import: const mod = await import("mimic-response"). On Node.js 20.19+, 22.12+ and newer, a plain require("mimic-response") also works for ESM packages that do not use top-level await. Alternatively pin mimic-response@3.1.0.

Does mimic-response work in Bun?

Yes. import "mimic-response" loaded successfully in Bun 1.4 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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