canirequire › CommonJS › ts-jest
Is ts-jest ESM-only? Can you require() it?
A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript
Last verified Sep 9, 2026 against ts-jest@29.4.12. JSON
CommonJS CommonJS — require() works on every Node.js version
ts-jest ships CommonJS only. require("ts-jest") works everywhere. import "ts-jest" 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.
Does ts-jest@29.4.12 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("ts-jest") from a CommonJS file and import "ts-jest" from an ES module.
| Runtime | require("ts-jest") | import "ts-jest" |
|---|---|---|
| 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 ts-jest
ES modules (import)
import tsJest from "ts-jest";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 tsJest = require("ts-jest");Module format by version
Derived from the type, main and exports fields of every stable release on npm (184 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 27.0.0 – 29.4.12 | CommonJS | May 25, 2021 |
Frequently asked
Is ts-jest ESM-only?
ts-jest@29.4.12 is a CommonJS package. ts-jest ships CommonJS only. require("ts-jest") works everywhere. import "ts-jest" 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 ts-jest with ES module syntax?
Yes. import tsJest from "ts-jest" 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 ts-jest work in Bun?
Yes. import "ts-jest" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does ts-jest ship TypeScript types?
Yes. ts-jest bundles its own type declarations; no @types package is needed.
Links
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