canirequire › Dual (CommonJS + ESM) › @jest/fake-timers
Is @jest/fake-timers ESM-only? Can you require() it?
Last verified Sep 9, 2026 against @jest/fake-timers@30.5.1. Markdown · JSON
Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too
@jest/fake-timers publishes both a CommonJS entry and a native ESM entry (ESM added in 30.0.0). require("@jest/fake-timers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "@jest/fake-timers" works alongside it.
What to do
- Nothing to change. require("@jest/fake-timers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import * as fakeTimers from "@jest/fake-timers" works alongside it; use named imports for what the ESM entry exports.
- TypeScript: types are bundled; install nothing extra.
Does @jest/fake-timers@30.5.1 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("@jest/fake-timers") from a CommonJS file and import "@jest/fake-timers" from an ES module.
| Runtime | require("@jest/fake-timers") | import "@jest/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 1.4.0 | ✓ works | ✓ works |
How to import @jest/fake-timers
ES modules (import)
import * as fakeTimers from "@jest/fake-timers";Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.
CommonJS (require)
const fakeTimers = require("@jest/fake-timers");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 (92 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 30.0.0 – 30.5.1 | Dual (CommonJS + ESM) | Jun 10, 2025 |
| 27.0.6 – 29.7.0 | CommonJS | Jun 28, 2021 |
Frequently asked
Is @jest/fake-timers ESM-only?
@jest/fake-timers@30.5.1 ships CommonJS and ESM builds. @jest/fake-timers publishes both a CommonJS entry and a native ESM entry (ESM added in 30.0.0). require("@jest/fake-timers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "@jest/fake-timers" works alongside it.
Can I require @jest/fake-timers?
Yes. @jest/fake-timers ships a CommonJS entry alongside the native ESM entry. require("@jest/fake-timers") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0.
Does @jest/fake-timers work in Bun?
Yes. import "@jest/fake-timers" loaded successfully in Bun 1.4.0 on Sep 9, 2026.
Does @jest/fake-timers ship TypeScript types?
Yes. @jest/fake-timers bundles its own type declarations; no @types package is needed.
Links
Other dual (commonjs + esm) packages
- minimatch 10.2.6Dual
- brace-expansion 5.0.9Dual
- lru-cache 11.5.2Dual
- tslib 2.8.1Dual
- glob 13.0.6Dual
- eslint-visitor-keys 5.0.1Dual
- yallist 5.0.0Dual
- balanced-match 4.0.4Dual
Similar popularity
- web-streams-polyfill 4.3.0Dual
- import-in-the-middle 3.5.0CommonJS
- @radix-ui/react-focus-guards 1.1.6Dual
- @csstools/css-tokenizer 4.0.0ESM-only
- bignumber.js 11.1.5Dual
- @jest/environment 30.5.1CommonJS
- colorette 2.0.20Dual
- jest-validate 30.5.1Dual