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Is ts-mocha ESM-only? Can you require() it?

Mocha thin wrapper that allows running TypeScript tests with TypeScript runtime (ts-node) to get rid of compilation complexity

Last verified Sep 9, 2026 against ts-mocha@11.1.0. JSON

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

ts-mocha ships CommonJS only. require("ts-mocha") works everywhere. import "ts-mocha" 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
11.1.0 (Feb 20, 2025)
Module format
CommonJS
Last CommonJS version
11.1.0
TypeScript types
None
Node engines
>= 6.X.X
Weekly downloads
453K
License
MIT

Does ts-mocha@11.1.0 actually load? Runtime test results

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

Runtimerequire("ts-mocha")import "ts-mocha"
Node.js 18✗ fails✗ fails
Node.js 20✗ fails✗ fails
Node.js 22✗ fails✗ fails
Node.js 24✗ fails✗ fails
Node.js 26✗ fails✗ fails
Bun 1.4✗ fails✗ fails

A failing require() on a CommonJS package usually means the package needs a browser/DOM global, a peer dependency, or a native binary that is not available in a bare Node.js process.

How to import ts-mocha

ES modules (import)

import tsMocha from "ts-mocha";

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 tsMocha = require("ts-mocha");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (18 versions; the newest 18 shown).

VersionsFormatFirst published
0.1.1 – 11.1.0CommonJSDec 10, 2016

Frequently asked

Is ts-mocha ESM-only?

ts-mocha@11.1.0 is a CommonJS package. ts-mocha ships CommonJS only. require("ts-mocha") works everywhere. import "ts-mocha" 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-mocha with ES module syntax?

Yes. import tsMocha from "ts-mocha" 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-mocha work in Bun?

Importing ts-mocha failed in Bun 1.4 on Sep 9, 2026.

Does ts-mocha ship TypeScript types?

No. ts-mocha ships no type declarations and there is no @types package for it.

Links

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