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Is @sinonjs/fake-timers ESM-only? Can you require() it?

Fake JavaScript timers

Last verified Sep 9, 2026 against @sinonjs/fake-timers@15.4.0. JSON

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

@sinonjs/fake-timers ships CommonJS only. require("@sinonjs/fake-timers") works everywhere. import "@sinonjs/fake-timers" 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
15.4.0 (May 5, 2026)
Module format
CommonJS
Last CommonJS version
15.4.0
TypeScript types
Bundled
Node engines
not declared
License
BSD-3-Clause

Does @sinonjs/fake-timers@15.4.0 actually load? Runtime test results

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

Runtimerequire("@sinonjs/fake-timers")import "@sinonjs/fake-timers"
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 @sinonjs/fake-timers

ES modules (import)

import fakeTimers from "@sinonjs/fake-timers";

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 fakeTimers = require("@sinonjs/fake-timers");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (49 versions; the newest 49 shown).

VersionsFormatFirst published
6.0.0 – 15.4.0CommonJSFeb 4, 2020

Frequently asked

Is @sinonjs/fake-timers ESM-only?

@sinonjs/fake-timers@15.4.0 is a CommonJS package. @sinonjs/fake-timers ships CommonJS only. require("@sinonjs/fake-timers") works everywhere. import "@sinonjs/fake-timers" 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 @sinonjs/fake-timers with ES module syntax?

Yes. import fakeTimers from "@sinonjs/fake-timers" 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 @sinonjs/fake-timers work in Bun?

Yes. import "@sinonjs/fake-timers" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @sinonjs/fake-timers ship TypeScript types?

Yes. @sinonjs/fake-timers bundles its own type declarations; no @types package is needed.

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